Coreboot Options

This is an automatically generated list of coreboot compile-time options.

Last update: 4.8-209-g438b463a8f

Option	Source	Format	Short Description	Description
Menu: General setup
LOCALVERSION	toplevel	string	Local version string	Append an extra string to the end of the coreboot version. This can be useful if, for instance, you want to append the respective board's hostname or some other identifying string to the coreboot version number, so that you can easily distinguish boot logs of different boards from each other.
CBFS_PREFIX	toplevel	string	CBFS prefix to use	Select the prefix to all files put into the image. It's "fallback" by default, "normal" is a common alternative.
CBFS_PREFIX	toplevel	string	Compiler to use	This option allows you to select the compiler used for building coreboot. You must build the coreboot crosscompiler for the board that you have selected. To build all the GCC crosscompilers (takes a LONG time), run: make crossgcc For help on individual architectures, run the command: make help_toolchain
COMPILER_GCC	toplevel	bool	GCC	Use the GNU Compiler Collection (GCC) to build coreboot. For details see http://gcc.gnu.org.
COMPILER_LLVM_CLANG	toplevel	bool	LLVM/clang (TESTING ONLY - Not currently working)	Use LLVM/clang to build coreboot. To use this, you must build the coreboot version of the clang compiler. Run the command make clang Note that this option is not currently working correctly and should really only be selected if you're trying to work on getting clang operational. For details see http://clang.llvm.org.
ANY_TOOLCHAIN	toplevel	bool	Allow building with any toolchain	Many toolchains break when building coreboot since it uses quite unusual linker features. Unless developers explicitely request it, we'll have to assume that they use their distro compiler by mistake. Make sure that using patched compilers is a conscious decision.
CCACHE	toplevel	bool	Use ccache to speed up (re)compilation	Enables the use of ccache for faster builds. Requires the ccache utility in your system $PATH. For details see https://ccache.samba.org.
FMD_GENPARSER	toplevel	bool	Generate flashmap descriptor parser using flex and bison	Enable this option if you are working on the flashmap descriptor parser and made changes to fmd_scanner.l or fmd_parser.y. Otherwise, say N to use the provided pregenerated scanner/parser.
UTIL_GENPARSER	toplevel	bool	Generate SCONFIG & BINCFG parser using flex and bison	Enable this option if you are working on the sconfig device tree parser or bincfg and made changes to the .l or .y files. Otherwise, say N to use the provided pregenerated scanner/parser.
USE_OPTION_TABLE	toplevel	bool	Use CMOS for configuration values	Enable this option if coreboot shall read options from the "CMOS" NVRAM instead of using hard-coded values.
STATIC_OPTION_TABLE	toplevel	bool	Load default configuration values into CMOS on each boot	Enable this option to reset "CMOS" NVRAM values to default on every boot. Use this if you want the NVRAM configuration to never be modified from its default values.
COMPRESS_RAMSTAGE	toplevel	bool	Compress ramstage with LZMA	Compress ramstage to save memory in the flash image. Note that decompression might slow down booting if the boot flash is connected through a slow link (i.e. SPI).
COMPRESS_PRERAM_STAGES	toplevel	bool	Compress romstage and verstage with LZ4	Compress romstage and (if it exists) verstage with LZ4 to save flash space and speed up boot, since the time for reading the image from SPI (and in the vboot case verifying it) is usually much greater than the time spent decompressing. Doesn't work for XIP stages (assume all ARCH_X86 for now) for obvious reasons.
COMPRESS_BOOTBLOCK	toplevel	bool		This option can be used to compress the bootblock with LZ4 and attach a small self-decompression stub to its front. This can drastically reduce boot time on platforms where the bootblock is loaded over a very slow connection and bootblock size trumps all other factors for speed. Since this using this option usually requires changes to the SoC memlayout and possibly extra support code, it should not be user-selectable. (There's no real point in offering this to the user anyway... if it works and saves boot time, you would always want it.)
INCLUDE_CONFIG_FILE	toplevel	bool	Include the coreboot .config file into the ROM image	Include the .config file that was used to compile coreboot in the (CBFS) ROM image. This is useful if you want to know which options were used to build a specific coreboot.rom image. Saying Y here will increase the image size by 2-3KB. You can use the following command to easily list the options: grep -a CONFIG_ coreboot.rom Alternatively, you can also use cbfstool to print the image contents (including the raw 'config' item we're looking for). Example: $ cbfstool coreboot.rom print coreboot.rom: 4096 kB, bootblocksize 1008, romsize 4194304, offset 0x0 Alignment: 64 bytes Name Offset Type Size cmos_layout.bin 0x0 cmos layout 1159 fallback/romstage 0x4c0 stage 339756 fallback/ramstage 0x53440 stage 186664 fallback/payload 0x80dc0 payload 51526 config 0x8d740 raw 3324 (empty) 0x8e480 null 3610440
COLLECT_TIMESTAMPS	toplevel	bool	Create a table of timestamps collected during boot	Make coreboot create a table of timer-ID/timer-value pairs to allow measuring time spent at different phases of the boot process.
TIMESTAMPS_ON_CONSOLE	toplevel	bool	Print the timestamp values on the console	Print the timestamps to the debug console if enabled at level spew.
USE_BLOBS	toplevel	bool	Allow use of binary-only repository	This draws in the blobs repository, which contains binary files that might be required for some chipsets or boards. This flag ensures that a "Free" option remains available for users.
COVERAGE	toplevel	bool	Code coverage support	Add code coverage support for coreboot. This will store code coverage information in CBMEM for extraction from user space. If unsure, say N.
UBSAN	toplevel	bool	Undefined behavior sanitizer support	Instrument the code with checks for undefined behavior. If unsure, say N because it adds a small performance penalty and may abort on code that happens to work in spite of the UB.
RELOCATABLE_RAMSTAGE	toplevel	bool	Build the ramstage to be relocatable in 32-bit address space.	The reloctable ramstage support allows for the ramstage to be built as a relocatable module. The stage loader can identify a place out of the OS way so that copying memory is unnecessary during an S3 wake. When selecting this option the romstage is responsible for determing a stack location to use for loading the ramstage.
CACHE_RELOCATED_RAMSTAGE_OUTSIDE_CBMEM	toplevel	bool		The relocated ramstage is saved in an area specified by the by the board and/or chipset.
UPDATE_IMAGE	toplevel	bool	Update existing coreboot.rom image	If this option is enabled, no new coreboot.rom file is created. Instead it is expected that there already is a suitable file for further processing. The bootblock will not be modified. If unsure, select 'N'
BOOTSPLASH_IMAGE	toplevel	bool	Add a bootsplash image	Select this option if you have a bootsplash image that you would like to add to your ROM. This will only add the image to the ROM. To actually run it check options under 'Display' section.
BOOTSPLASH_FILE	toplevel	string	Bootsplash path and filename	The path and filename of the file to use as graphical bootsplash screen. The file format has to be jpg.
Menu: Mainboard
		(comment)		Important: Run 'make distclean' before switching boards
VENDOR_WINNET	mainboard/winnet.name	bool	WinNET	WinNET boards. Used in various thin client appliances.
UART_FOR_CONSOLE	mainboard/intel/mohonpeak	int		The Mohon Peak board uses COM2 (2f8) for the serial console.
PAYLOAD_CONFIGFILE	mainboard/intel/mohonpeak	string		The Avoton/Rangeley chip does not allow devices to write into the 0xe000 segment. This means that USB/SATA devices will not work in SeaBIOS unless we put the SeaBIOS buffer area down in the 0x9000 segment.
ENABLE_FSP_MEMORY_DOWN	mainboard/intel/harcuvar	bool	Enable Memory Down	Select this option to enable Memory Down function.
SPD_LOC	mainboard/intel/harcuvar	hex	SPD binary location in cbfs	Location of SPD binary for memory down function.
VBOOT	mainboard/intel/kblrvp	None	TPM to USE	This option allows you to select the TPM to use. Select whether the board does not have TPM, TPM 1.1 or TPM 2.0
UART_FOR_CONSOLE	mainboard/intel/littleplains	int		The Little Plains board uses COM2 (2f8) for the serial console.
PAYLOAD_CONFIGFILE	mainboard/intel/littleplains	string		The Avoton/Rangeley chip does not allow devices to write into the 0xe000 segment. This means that USB/SATA devices will not work in SeaBIOS unless we put the SeaBIOS buffer area down in the 0x9000 segment.
GALILEO_GEN2	mainboard/intel/galileo	bool	Board generation: GEN1 (n) or GEN2 (y)	The coreboot binary will configure only one generation of the Galileo board since coreboot can not determine the board generation at runtime. Select which generation of the Galileo that coreboot should initialize.
FSP_VERSION_1_1	mainboard/intel/galileo	bool	FSP 1.1	Use FSP 1_1 binary
FSP_VERSION_2_0	mainboard/intel/galileo	bool	FSP 2.0	Use FSP 2.0 binary
FSP_BUILD_TYPE_DEBUG	mainboard/intel/galileo	bool	Debug	Use the debug version of FSP
FSP_BUILD_TYPE_RELEASE	mainboard/intel/galileo	bool	Release	Use the release version of FSP
FSP_TYPE_1_1	mainboard/intel/galileo	bool	MemInit subroutine	FSP 1.1 implemented as subroutines, no EDK-II cores
FSP_TYPE_1_1_PEI	mainboard/intel/galileo	bool	SEC + PEI Core + MemInit PEIM	FSP 1.1 implemented using SEC and PEI core
FSP_TYPE_2_0	mainboard/intel/galileo	bool	MemInit subroutine	FSP 2.0 implemented as subroutines, no EDK-II cores
FSP_TYPE_2_0_PEI	mainboard/intel/galileo	bool	SEC + PEI Core + MemInit PEIM	FSP 2.0 implemented using SEC and PEI core
FSP_DEBUG_ALL	mainboard/intel/galileo	bool	Enable all FSP debug support	Turn on debug support to display HOBS, MTRRS, SMM_MEMORY_MAP, UPD_DATA also turn on FSP 2.0 debug support for ESRAM_LAYOUT, FSP_CALLS_AND_STATUS, FSP_HEADER, POSTCAR_CONSOLE and VERIFY_HOBS or FSP 1.1 DISPLAY_FSP_ENTRY_POINTS
VBOOT_WITH_CRYPTO_SHIELD	mainboard/intel/galileo	bool	Verified boot using the Crypto Shield board	Perform a verified boot using the TPM on the Crypto Shield board.
DRIVER_TPM_I2C_ADDR	mainboard/intel/galileo	hex	Address of the I2C TPM chip	I2C address of the TPM chip on the Crypto Shield board.
FMDFILE	mainboard/intel/galileo	string	FMAP description file in fmd format	The build system creates a default FMAP from ROM_SIZE and CBFS_SIZE, but in some cases more complex setups are required. When an FMD descriptionn file is specified, the build system uses it instead of creating a default FMAP file.
BASEBOARD_GLKRVP_LAPTOP	mainboard/intel/glkrvp	None	ON BOARD EC	This option allows you to select the on board EC to use. Select whether the board has Intel EC or Chrome EC
Menu: Debugging
DISABLE_UART_ON_TESTPADS	mainboard/intel/dcp847ske	bool	Disable UART on testpads	Serial output requires soldering to the testpad next to NCT5577D pin 18 (txd) and gnd.
VGA_BIOS_FILE	mainboard/intel/strago	string		The C0 version of the video bios gets computed from this name so that they can both be added. Only the correct one for the system will be run.
VGA_BIOS_ID	mainboard/intel/strago	string		The VGA_BIOS_ID for the C0 version of the video bios is hardcoded in soc/intel/braswell/Makefile.inc as 8086,22b1
BOARD_EMULATION_SPIKE_UCB_RISCV	mainboard/emulation/spike-riscv.name	bool	SPIKE ucb riscv	To run coreboot in spike: run "make" as usual util/riscv/make-spike-elf.sh build/coreboot.{rom,elf} spike -m1024 build/coreboot.elf
HUDSON_LEGACY_FREE	mainboard/bap/ode_e21XX	bool	Select DDR3 clock	Select your preferenced DDR3 clock setting. Note: This option changes the total power consumption. If unsure, use DDR3-1333.
HUDSON_LEGACY_FREE	mainboard/bap/ode_e20XX	bool	Select DDR3 clock	Select your preferred DDR3 clock setting. Note: This option changes the total power consumption. If unsure, use DDR3-1066.
ENABLE_DP3_DAUGHTER_CARD_IN_J120	mainboard/amd/lamar	bool	Use J120 as an additional graphics port	The PCI Express slot at J120 can be configured as an additional DisplayPort connector using an adapter card from AMD or as a normal PCI Express (x4) slot. By default, the connector is configured as a PCI Express (x4) slot. Select this option to enable the slot for use with one of AMD's passive graphics port expander cards (only available from AMD).
		(comment)		Slippy
		(comment)		Octopus
		(comment)		Auron
		(comment)		Gru
		(comment)		Cyan
		(comment)		Reef
		(comment)		Jecht
		(comment)		Beltino
		(comment)		Rambi
		(comment)		Kahlee
		(comment)		Poppy
		(comment)		Zoombini
		(comment)		Veyron
		(comment)		Oak
MAINBOARD_PART_NUMBER	mainboard/google/nyan_blaze	string	BCT boot media	Which boot media to configure the BCT for.
NYAN_BLAZE_BCT_CFG_SPI	mainboard/google/nyan_blaze	bool	SPI	Configure the BCT for booting from SPI.
NYAN_BLAZE_BCT_CFG_EMMC	mainboard/google/nyan_blaze	bool	eMMC	Configure the BCT for booting from eMMC.
BOOT_DEVICE_SPI_FLASH_BUS	mainboard/google/nyan_blaze	int	SPI bus with boot media ROM	Which SPI bus the boot media is connected to.
DISPLAY_SPD_DATA	mainboard/google/cyan	bool	Display Memory Serial Presence Detect Data	When enabled displays the memory configuration data.
VGA_BIOS_FILE	mainboard/google/cyan	string		The C0 version of the video bios gets computed from this name so that they can both be added. Only the correct one for the system will be run.
VGA_BIOS_ID	mainboard/google/cyan	string		The VGA_BIOS_ID for the C0 version of the video bios is hardcoded in soc/intel/braswell/Makefile.inc as 8086,22b1
FMDFILE	mainboard/google/kahlee	string		The build system creates a default FMAP from ROM_SIZE and CBFS_SIZE, but in some cases more complex setups are required. When an fmd is specified, it overrides the default format.
DRAM_SIZE_MB	mainboard/google/smaug	int	BCT boot media	Which boot media to configure the BCT for.
SMAUG_BCT_CFG_SPI	mainboard/google/smaug	bool	SPI	Configure the BCT for booting from SPI.
SMAUG_BCT_CFG_EMMC	mainboard/google/smaug	bool	eMMC	Configure the BCT for booting from eMMC.
BOOT_DEVICE_SPI_FLASH_BUS	mainboard/google/smaug	int	SPI bus with boot media ROM	Which SPI bus the boot media is connected to.
MAINBOARD_PART_NUMBER	mainboard/google/nyan_big	string	BCT boot media	Which boot media to configure the BCT for.
NYAN_BIG_BCT_CFG_SPI	mainboard/google/nyan_big	bool	SPI	Configure the BCT for booting from SPI.
NYAN_BIG_BCT_CFG_EMMC	mainboard/google/nyan_big	bool	eMMC	Configure the BCT for booting from eMMC.
BOOT_DEVICE_SPI_FLASH_BUS	mainboard/google/nyan_big	int	SPI bus with boot media ROM	Which SPI bus the boot media is connected to.
DRAM_SIZE_MB	mainboard/google/foster	int	BCT boot media	Which boot media to configure the BCT for.
FOSTER_BCT_CFG_SPI	mainboard/google/foster	bool	SPI	Configure the BCT for booting from SPI.
FOSTER_BCT_CFG_EMMC	mainboard/google/foster	bool	eMMC	Configure the BCT for booting from eMMC.
BOOT_DEVICE_SPI_FLASH_BUS	mainboard/google/foster	int	SPI bus with boot media ROM	Which SPI bus the boot media is connected to.
MAINBOARD_PART_NUMBER	mainboard/google/nyan	string	BCT boot media	Which boot media to configure the BCT for.
NYAN_BCT_CFG_SPI	mainboard/google/nyan	bool	SPI	Configure the BCT for booting from SPI.
NYAN_BCT_CFG_EMMC	mainboard/google/nyan	bool	eMMC	Configure the BCT for booting from eMMC.
BOOT_DEVICE_SPI_FLASH_BUS	mainboard/google/nyan	int	SPI bus with boot media ROM	Which SPI bus the boot media is connected to.
UART_FOR_CONSOLE	mainboard/adi/rcc-dff	int		The Mohon Peak board uses COM2 (2f8) for the serial console.
PAYLOAD_CONFIGFILE	mainboard/adi/rcc-dff	string		The Avoton/Rangeley chip does not allow devices to write into the 0xe000 segment. This means that USB/SATA devices will not work in SeaBIOS unless we put the SeaBIOS buffer area down in the 0x9000 segment.
BOARD_ASUS_F2A85_M_DDR3_VOLT_135	mainboard/asus/f2a85-m	bool	1.35V	Set DRR3 memory voltage to 1.35V
BOARD_ASUS_F2A85_M_DDR3_VOLT_150	mainboard/asus/f2a85-m	bool	1.50V	Set DRR3 memory voltage to 1.50V
BOARD_ASUS_F2A85_M_DDR3_VOLT_165	mainboard/asus/f2a85-m	bool	1.65V	Set DRR3 memory voltage to 1.65V
BOARD_WINNET_G170	mainboard/winnet/g170.name	bool	WinNET G170 (Neoware CA19, IGEL 2110)	G170 is a board manufactured by WinNET, used in thin clients including HP Neoware CA19 and IGEL 2110.
BMC_INFO_LOC	mainboard/scaleway/tagada	hex	BMC information location in flash	Location of BMC SERIAL information.
NO_POST	mainboard/purism/librem_skl	int		This platform does not have any way to see POST codes so disable them by default.
DRIVERS_PS2_KEYBOARD	mainboard/purism/librem_bdw	string		Default PS/2 Keyboard to enabled on this board.
DRIVERS_UART_8250IO	mainboard/purism/librem_bdw	string		This platform does not have any way to get standard serial output so disable it by default.
NO_POST	mainboard/purism/librem_bdw	int		This platform does not have any way to see POST codes so disable them by default.
		(comment)		was acquired by ADLINK
ONBOARD_UARTS_RS485	mainboard/lippert/spacerunner-lx	bool	Switch on-board serial ports to RS485	If selected, both on-board serial ports will operate in RS485 mode instead of RS232.
ONBOARD_IDE_SLAVE	mainboard/lippert/spacerunner-lx	bool	Make on-board SSD act as Slave	If selected, the on-board SSD will act as IDE Slave instead of Master.
BOARD_OLD_REVISION	mainboard/lippert/hurricane-lx	bool	Board is old pre-3.0 revision	Look on the bottom side for a number like 406-0001-30. The last 2 digits state the PCB revision (3.0 in this example). For 2.0 or older boards choose Y, for 3.0 and newer say N. Old revision boards need a jumper shorting the power button to power on automatically. You may enable the button only after this jumper has been removed. New revision boards are not restricted in this way, and always have the power button enabled.
ONBOARD_UARTS_RS485	mainboard/lippert/hurricane-lx	bool	Switch on-board serial ports to RS485	If selected, both on-board serial ports will operate in RS485 mode instead of RS232.
ONBOARD_UARTS_RS485	mainboard/lippert/literunner-lx	bool	Switch on-board serial ports 1 & 2 to RS485	If selected, the first two on-board serial ports will operate in RS485 mode instead of RS232.
ONBOARD_IDE_SLAVE	mainboard/lippert/literunner-lx	bool	Make on-board CF socket act as Slave	If selected, the on-board Compact Flash card socket will act as IDE Slave instead of Master.
ONBOARD_UARTS_RS485	mainboard/lippert/roadrunner-lx	bool	Switch on-board serial ports to RS485	If selected, both on-board serial ports will operate in RS485 mode instead of RS232.
		(comment)		see under vendor LiPPERT
		(comment)		WARNING: This mainboard uses LATE_CBMEM_INIT, which is deprecated
BOARD_ROMSIZE_KB_65536	mainboard	bool	ROM chip size	Select the size of the ROM chip you intend to flash coreboot on. The build system will take care of creating a coreboot.rom file of the matching size.
COREBOOT_ROMSIZE_KB_64	mainboard	bool	64 KB	Choose this option if you have a 64 KB ROM chip.
COREBOOT_ROMSIZE_KB_128	mainboard	bool	128 KB	Choose this option if you have a 128 KB ROM chip.
COREBOOT_ROMSIZE_KB_256	mainboard	bool	256 KB	Choose this option if you have a 256 KB ROM chip.
COREBOOT_ROMSIZE_KB_512	mainboard	bool	512 KB	Choose this option if you have a 512 KB ROM chip.
COREBOOT_ROMSIZE_KB_1024	mainboard	bool	1024 KB (1 MB)	Choose this option if you have a 1024 KB (1 MB) ROM chip.
COREBOOT_ROMSIZE_KB_2048	mainboard	bool	2048 KB (2 MB)	Choose this option if you have a 2048 KB (2 MB) ROM chip.
COREBOOT_ROMSIZE_KB_4096	mainboard	bool	4096 KB (4 MB)	Choose this option if you have a 4096 KB (4 MB) ROM chip.
COREBOOT_ROMSIZE_KB_8192	mainboard	bool	8192 KB (8 MB)	Choose this option if you have a 8192 KB (8 MB) ROM chip.
COREBOOT_ROMSIZE_KB_10240	mainboard	bool	10240 KB (10 MB)	Choose this option if you have a 10240 KB (10 MB) ROM chip.
COREBOOT_ROMSIZE_KB_12288	mainboard	bool	12288 KB (12 MB)	Choose this option if you have a 12288 KB (12 MB) ROM chip.
COREBOOT_ROMSIZE_KB_16384	mainboard	bool	16384 KB (16 MB)	Choose this option if you have a 16384 KB (16 MB) ROM chip.
COREBOOT_ROMSIZE_KB_32768	mainboard	bool	32768 KB (32 MB)	Choose this option if you have a 32768 KB (32 MB) ROM chip.
COREBOOT_ROMSIZE_KB_65536	mainboard	bool	65536 KB (64 MB)	Choose this option if you have a 65536 KB (64 MB) ROM chip.
ENABLE_POWER_BUTTON	mainboard	bool	Enable the power button	The selected mainboard can optionally have the power button tied to ground with a jumper so that the button appears to be constantly depressed. If this option is enabled and the jumper is installed then the board will turn on, but turn off again after a short timeout, usually 4 seconds. Select Y here if you have removed the jumper and want to use an actual power button. Select N if you have the jumper installed.
DEVICETREE	toplevel	string		This symbol allows mainboards to select a different file under their mainboard directory for the devicetree.cb file. This allows the board variants that need different devicetrees to be in the same directory. Examples: "devicetree.variant.cb" "variant/devicetree.cb"
CBFS_SIZE	toplevel	hex	Size of CBFS filesystem in ROM	This is the part of the ROM actually managed by CBFS, located at the end of the ROM (passed through cbfstool -o) on x86 and at at the start of the ROM (passed through cbfstool -s) everywhere else. It defaults to span the whole ROM on all but Intel systems that use an Intel Firmware Descriptor. It can be overridden to make coreboot live alongside other components like ChromeOS's vboot/FMAP or Intel's IFD / ME / TXE binaries.
FMDFILE	toplevel	string	fmap description file in fmd format	The build system creates a default FMAP from ROM_SIZE and CBFS_SIZE, but in some cases more complex setups are required. When an fmd is specified, it overrides the default format.
CBFS_AUTOGEN_ATTRIBUTES	toplevel	bool		If this option is selected, every file in cbfs which has a constraint regarding position or alignment will get an additional file attribute which describes this constraint.
Menu: Chipset
		(comment)		SoC
MAINBOARD_DO_DSI_INIT	soc/nvidia/tegra210	bool	Use dsi graphics interface	Initialize dsi display
MAINBOARD_DO_SOR_INIT	soc/nvidia/tegra210	bool	Use dp graphics interface	Initialize dp display
CONSOLE_SERIAL_TEGRA210_UARTA	soc/nvidia/tegra210	bool	UARTA	Serial console on UART A.
CONSOLE_SERIAL_TEGRA210_UARTB	soc/nvidia/tegra210	bool	UARTB	Serial console on UART B.
CONSOLE_SERIAL_TEGRA210_UARTC	soc/nvidia/tegra210	bool	UARTC	Serial console on UART C.
CONSOLE_SERIAL_TEGRA210_UARTD	soc/nvidia/tegra210	bool	UARTD	Serial console on UART D.
CONSOLE_SERIAL_TEGRA210_UARTE	soc/nvidia/tegra210	bool	UARTE	Serial console on UART E.
CONSOLE_SERIAL_TEGRA210_UART_ADDRESS	soc/nvidia/tegra210	hex		Map the UART names to the respective MMIO addres.
BOOTROM_SDRAM_INIT	soc/nvidia/tegra210	bool	SoC BootROM does SDRAM init with full BCT	Use during Foster LPDDR4 bringup.
TRUSTZONE_CARVEOUT_SIZE_MB	soc/nvidia/tegra210	hex	Size of Trust Zone region	Size of Trust Zone area in MiB to reserve in memory map.
TTB_SIZE_MB	soc/nvidia/tegra210	hex	Size of TTB	Maximum size of Translation Table Buffer in MiB.
SEC_COMPONENT_SIZE_MB	soc/nvidia/tegra210	hex	Size of resident EL3 components	Maximum size of resident EL3 components in MiB including BL31 and Secure OS.
HAVE_MTC	soc/nvidia/tegra210	bool	Add external Memory controller Training Code binary	Select this option to add emc training firmware
MTC_FILE	soc/nvidia/tegra210	string	tegra mtc firmware filename	The filename of the mtc firmware
MTC_DIRECTORY	soc/nvidia/tegra210	string	Directory where MTC firmware file is located	Path to directory where MTC firmware file is located.
MTC_ADDRESS	soc/nvidia/tegra210	hex		The DRAM location where MTC firmware to be loaded in. This location needs to be consistent with the location defined in tegra_mtc.ld
SOC_INTEL_APOLLOLAKE	soc/intel/apollolake	bool		Intel Apollolake support
SOC_INTEL_GLK	soc/intel/apollolake	bool		Intel GLK support
TPM_ON_FAST_SPI	soc/intel/apollolake	bool		TPM part is conntected on Fast SPI interface, but the LPC MMIO TPM transactions are decoded and serialized over the SPI interface.
PCR_BASE_ADDRESS	soc/intel/apollolake	hex		This option allows you to select MMIO Base Address of sideband bus.
DCACHE_RAM_SIZE	soc/intel/apollolake	hex		The size of the cache-as-ram region required during bootblock and/or romstage.
DCACHE_BSP_STACK_SIZE	soc/intel/apollolake	hex		The amount of anticipated stack usage in CAR by bootblock and other stages.
ROMSTAGE_ADDR	soc/intel/apollolake	hex		The base address (in CAR) where romstage should be linked
VERSTAGE_ADDR	soc/intel/apollolake	hex		The base address (in CAR) where verstage should be linked
FSP_M_ADDR	soc/intel/apollolake	hex		The address FSP-M will be relocated to during build time
NEED_LBP2	soc/intel/apollolake	bool	Write contents for logical boot partition 2.	Write the contents from a file into the logical boot partition 2 region defined by LBP2_FMAP_NAME.
LBP2_FMAP_NAME	soc/intel/apollolake	string	Name of FMAP region to put logical boot partition 2	Name of FMAP region to write logical boot partition 2 data.
LBP2_FILE_NAME	soc/intel/apollolake	string	Path of file to write to logical boot partition 2 region	Name of file to store in the logical boot partition 2 region.
NEED_IFWI	soc/intel/apollolake	bool	Write content into IFWI region	Write the content from a file into IFWI region defined by IFWI_FMAP_NAME.
IFWI_FMAP_NAME	soc/intel/apollolake	string	Name of FMAP region to pull IFWI into	Name of FMAP region to write IFWI.
IFWI_FILE_NAME	soc/intel/apollolake	string	Path of file to write to IFWI region	Name of file to store in the IFWI region.
NHLT_DMIC_1CH_16B	soc/intel/apollolake	bool		Include DSP firmware settings for 1 channel 16B DMIC array.
NHLT_DMIC_2CH_16B	soc/intel/apollolake	bool		Include DSP firmware settings for 2 channel 16B DMIC array.
NHLT_DMIC_4CH_16B	soc/intel/apollolake	bool		Include DSP firmware settings for 4 channel 16B DMIC array.
NHLT_MAX98357	soc/intel/apollolake	bool		Include DSP firmware settings for headset codec.
NHLT_DA7219	soc/intel/apollolake	bool		Include DSP firmware settings for headset codec.
NHLT_RT5682	soc/intel/apollolake	bool		Include DSP firmware settings for headset codec.
NHLT_RT5682	soc/intel/apollolake	bool	Cache-as-ram implementation	This option allows you to select how cache-as-ram (CAR) is set up.
CAR_NEM	soc/intel/apollolake	bool	Non-evict mode	Traditionally, CAR is set up by using Non-Evict mode. This method does not allow CAR and cache to co-exist, because cache fills are block in NEM mode.
CAR_CQOS	soc/intel/apollolake	bool	Cache Quality of Service	Cache Quality of Service allows more fine-grained control of cache usage. As result, it is possible to set up portion of L2 cache for CAR and use remainder for actual caching.
USE_APOLLOLAKE_FSP_CAR	soc/intel/apollolake	bool	Use FSP CAR	Use FSP APIs to initialize & tear down the Cache-As-Ram.
APL_SKIP_SET_POWER_LIMITS	soc/intel/apollolake	bool		Some Apollo Lake mainboards do not need the Running Average Power Limits (RAPL) algorithm for a constant power management. Set this config option to skip the RAPL configuration.
SOC_ESPI	soc/intel/apollolake	bool		Use eSPI bus instead of LPC
SOC_INTEL_BAYTRAIL	soc/intel/baytrail	bool		Bay Trail M/D part support.
HAVE_MRC	soc/intel/baytrail	bool	Add a Memory Reference Code binary	Select this option to add a blob containing memory reference code. Note: Without this binary coreboot will not work
MRC_FILE	soc/intel/baytrail	string	Intel memory refeference code path and filename	The path and filename of the file to use as System Agent binary. Note that this points to the sandybridge binary file which is will not work, but it serves its purpose to do builds.
DCACHE_RAM_SIZE	soc/intel/baytrail	hex		The size of the cache-as-ram region required during bootblock and/or romstage. Note DCACHE_RAM_SIZE and DCACHE_RAM_MRC_VAR_SIZE must add up to a power of 2.
DCACHE_RAM_MRC_VAR_SIZE	soc/intel/baytrail	hex		The amount of cache-as-ram region required by the reference code.
RESET_ON_INVALID_RAMSTAGE_CACHE	soc/intel/baytrail	bool	Reset the system on S3 wake when ramstage cache invalid.	The baytrail romstage code caches the loaded ramstage program in SMM space. On S3 wake the romstage will copy over a fresh ramstage that was cached in the SMM space. This option determines the action to take when the ramstage cache is invalid. If selected the system will reset otherwise the ramstage will be reloaded from cbfs.
ENABLE_BUILTIN_COM1	soc/intel/baytrail	bool	Enable builtin COM1 Serial Port	The PMC has a legacy COM1 serial port. Choose this option to configure the pads and enable it. This serial port can be used for the debug console.
HAVE_REFCODE_BLOB	soc/intel/baytrail	bool	An external reference code blob should be put into cbfs.	The reference code blob will be placed into cbfs.
REFCODE_BLOB_FILE	soc/intel/baytrail	string	Path and filename to reference code blob.	The path and filename to the file to be added to cbfs.
SOC_INTEL_BRASWELL	soc/intel/braswell	bool		Braswell M/D part support.
DCACHE_RAM_SIZE	soc/intel/braswell	hex		The size of the cache-as-ram region required during bootblock and/or romstage. Note DCACHE_RAM_SIZE and DCACHE_RAM_MRC_VAR_SIZE must add up to a power of 2.
RESET_ON_INVALID_RAMSTAGE_CACHE	soc/intel/braswell	bool	Reset the system on S3 wake when ramstage cache invalid.	The haswell romstage code caches the loaded ramstage program in SMM space. On S3 wake the romstage will copy over a fresh ramstage that was cached in the SMM space. This option determines the action to take when the ramstage cache is invalid. If selected the system will reset otherwise the ramstage will be reloaded from cbfs.
ENABLE_BUILTIN_COM1	soc/intel/braswell	bool	Enable builtin COM1 Serial Port	The PMC has a legacy COM1 serial port. Choose this option to configure the pads and enable it. This serial port can be used for the debug console.
SOC_INTEL_BROADWELL	soc/intel/broadwell	bool		Intel Broadwell and Haswell ULT support.
DCACHE_RAM_SIZE	soc/intel/broadwell	hex		The size of the cache-as-ram region required during bootblock and/or romstage. Note DCACHE_RAM_SIZE and DCACHE_RAM_MRC_VAR_SIZE must add up to a power of 2.
DCACHE_RAM_MRC_VAR_SIZE	soc/intel/broadwell	hex		The amount of cache-as-ram region required by the reference code.
HAVE_MRC	soc/intel/broadwell	bool	Add a Memory Reference Code binary	Select this option to add a Memory Reference Code binary to the resulting coreboot image. Note: Without this binary coreboot will not work
MRC_FILE	soc/intel/broadwell	string	Intel Memory Reference Code path and filename	The filename of the file to use as Memory Reference Code binary.
PRE_GRAPHICS_DELAY	soc/intel/broadwell	int	Graphics initialization delay in ms	On some systems, coreboot boots so fast that connected monitors (mostly TVs) won't be able to wake up fast enough to talk to the VBIOS. On those systems we need to wait for a bit before executing the VBIOS.
RESET_ON_INVALID_RAMSTAGE_CACHE	soc/intel/broadwell	bool	Reset the system on S3 wake when ramstage cache invalid.	The romstage code caches the loaded ramstage program in SMM space. On S3 wake the romstage will copy over a fresh ramstage that was cached in the SMM space. This option determines the action to take when the ramstage cache is invalid. If selected the system will reset otherwise the ramstage will be reloaded from cbfs.
SERIRQ_CONTINUOUS_MODE	soc/intel/broadwell	bool		If you set this option to y, the serial IRQ machine will be operated in continuous mode.
HAVE_REFCODE_BLOB	soc/intel/broadwell	bool	An external reference code blob should be put into cbfs.	The reference code blob will be placed into cbfs.
REFCODE_BLOB_FILE	soc/intel/broadwell	string	Path and filename to reference code blob.	The path and filename to the file to be added to cbfs.
SOC_INTEL_CANNONLAKE	soc/intel/cannonlake	bool		Intel Cannonlake support
UART_FOR_CONSOLE	soc/intel/cannonlake	int	Index for LPSS UART port to use for console	Index for LPSS UART port to use for console: 0 = LPSS UART0, 1 = LPSS UART1, 2 = LPSS UART2
DCACHE_RAM_SIZE	soc/intel/cannonlake	int		The size of the cache-as-ram region required during bootblock and/or romstage.
DCACHE_BSP_STACK_SIZE	soc/intel/cannonlake	hex		The amount of anticipated stack usage in CAR by bootblock and other stages.
NHLT_DMIC_1CH_16B	soc/intel/cannonlake	bool		Include DSP firmware settings for 1 channel 16B DMIC array.
NHLT_DMIC_2CH_16B	soc/intel/cannonlake	bool		Include DSP firmware settings for 2 channel 16B DMIC array.
NHLT_DMIC_4CH_16B	soc/intel/cannonlake	bool		Include DSP firmware settings for 4 channel 16B DMIC array.
NHLT_MAX98357	soc/intel/cannonlake	bool		Include DSP firmware settings for headset codec.
NHLT_MAX98373	soc/intel/cannonlake	bool		Include DSP firmware settings for headset codec.
NHLT_DA7219	soc/intel/cannonlake	bool		Include DSP firmware settings for headset codec.
PCR_BASE_ADDRESS	soc/intel/cannonlake	hex		This option allows you to select MMIO Base Address of sideband bus.
C_ENV_BOOTBLOCK_SIZE	soc/intel/cannonlake	hex	Cache-as-ram implementation	This option allows you to select how cache-as-ram (CAR) is set up.
USE_CANNONLAKE_CAR_NEM_ENHANCED	soc/intel/cannonlake	bool	Enhanced Non-evict mode	A current limitation of NEM (Non-Evict mode) is that code and data sizes are derived from the requirement to not write out any modified cache line. With NEM, if there is no physical memory behind the cached area, the modified data will be lost and NEM results will be inconsistent. ENHANCED NEM guarantees that modified data is always kept in cache while clean data is replaced.
USE_CANNONLAKE_FSP_CAR	soc/intel/cannonlake	bool	Use FSP CAR	Use FSP APIs to initialize and tear down the Cache-As-Ram.
SOC_INTEL_DENVERTON_NS	soc/intel/denverton_ns	bool		Intel Denverton-NS SoC support
FSP_T_ADDR	soc/intel/denverton_ns	hex	Intel FSP-T (temp ram init) binary location	The memory location of the Intel FSP-T binary for this platform.
FSP_M_ADDR	soc/intel/denverton_ns	hex	Intel FSP-M (memory init) binary location	The memory location of the Intel FSP-M binary for this platform.
FSP_S_ADDR	soc/intel/denverton_ns	hex	Intel FSP-S (silicon init) binary location	The memory location of the Intel FSP-S binary for this platform.
PCR_BASE_ADDRESS	soc/intel/denverton_ns	hex		This option allows you to select MMIO Base Address of sideband bus.
IQAT_MEMORY_REGION_SIZE	soc/intel/denverton_ns	hex		Do not change this value
NON_LEGACY_UART_MODE	soc/intel/denverton_ns	bool	Non Legacy Mode	Disable legacy UART mode
LEGACY_UART_MODE	soc/intel/denverton_ns	bool	Legacy Mode	Enable legacy UART mode
DENVERTON_NS_CAR_NEM_ENHANCED	soc/intel/denverton_ns	bool	Enhanced Non-evict mode	A current limitation of NEM (Non-Evict mode) is that code and data sizes are derived from the requirement to not write out any modified cache line. With NEM, if there is no physical memory behind the cached area, the modified data will be lost and NEM results will be inconsistent. ENHANCED NEM guarantees that modified data is always kept in cache while clean data is replaced.
SOC_INTEL_FSP_BAYTRAIL	soc/intel/fsp_baytrail	bool		Bay Trail I part support using the Intel FSP.
SMM_TSEG_SIZE	soc/intel/fsp_baytrail	hex		This is set by the FSP
VGA_BIOS_ID	soc/intel/fsp_baytrail	string		This is the default PCI ID for the Bay Trail graphics devices. This string names the vbios ROM in cbfs.
ENABLE_BUILTIN_COM1	soc/intel/fsp_baytrail	bool	Enable built-in legacy Serial Port	The Baytrail SOC has one legacy serial port. Choose this option to configure the pads and enable it. This serial port can be used for the debug console.
FSP_FILE	soc/intel/fsp_baytrail/fsp	string		The path and filename of the Intel FSP binary for this platform.
FSP_LOC	soc/intel/fsp_baytrail/fsp	hex		The location in CBFS that the FSP is located. This must match the value that is set in the FSP binary. If the FSP needs to be moved, rebase the FSP with Intel's BCT (tool). The Bay Trail FSP is built with a preferred base address of 0xFFFC0000.
SOC_INTEL_FSP_BROADWELL_DE	soc/intel/fsp_broadwell_de	bool		Broadwell-DE support using the Intel FSP.
INTEGRATED_UART	soc/intel/fsp_broadwell_de	bool	Integrated UART ports	Use Broadwell-DE Integrated UART ports @3F8h and 2F8h.
SERIRQ_CONTINUOUS_MODE	soc/intel/fsp_broadwell_de	bool		If you set this option to y, the serial IRQ machine will be operated in continuous mode.
FSP_FILE	soc/intel/fsp_broadwell_de/fsp	string		The path and filename of the Intel FSP binary for this platform.
FSP_LOC	soc/intel/fsp_broadwell_de/fsp	hex		The location in CBFS that the FSP is located. This must match the value that is set in the FSP binary. If the FSP needs to be moved, rebase the FSP with Intel's BCT (tool). The Broadwell-DE FSP is built with a preferred base address of 0xffeb0000.
DCACHE_RAM_BASE	soc/intel/fsp_broadwell_de/fsp	hex		This address needs to match the setup performed inside FSP. On Broadwell-DE the FSP allocates temporary RAM starting at 0xfe100000.
DCACHE_RAM_SIZE	soc/intel/fsp_broadwell_de/fsp	hex		The DCACHE is shared between FSP itself and the rest of the coreboot stages. A size of 0x8000 works fine while providing enough space for features like VBOOT in verstage. Further increase to a power of two aligned value leads to errors in FSP.
FSP_MEMORY_DOWN	soc/intel/fsp_broadwell_de/fsp	bool	Enable Memory Down	Load SPD data from ROM instead of trying to read from SMBus. If the platform has DIMM sockets, say N. If memory is down, say Y and supply the appropriate SPD data for each Channel/DIMM.
FSP_MEMORY_DOWN_CH0DIMM0_SPD_PRESENT	soc/intel/fsp_broadwell_de/fsp	bool	Channel 0, DIMM 0 Present	Select Y if Channel 0, DIMM 0 is present.
FSP_MEMORY_DOWN_CH0DIMM0_SPD_FILE	soc/intel/fsp_broadwell_de/fsp	string	Channel 0, DIMM 0 SPD File	Path to the file which contains the SPD data for Channel 0, DIMM 0.
FSP_MEMORY_DOWN_CH0DIMM1_SPD_PRESENT	soc/intel/fsp_broadwell_de/fsp	bool	Channel 0, DIMM 1 Present	Select Y if Channel 0, DIMM 1 is present.
FSP_MEMORY_DOWN_CH0DIMM1_SPD_FILE	soc/intel/fsp_broadwell_de/fsp	string	Channel 0, DIMM 1 SPD File	Path to the file which contains the SPD data for Channel 0, DIMM 1.
FSP_MEMORY_DOWN_CH1DIMM0_SPD_PRESENT	soc/intel/fsp_broadwell_de/fsp	bool	Channel 1, DIMM 0 Present	Select Y if Channel 1, DIMM 0 is present.
FSP_MEMORY_DOWN_CH1DIMM0_SPD_FILE	soc/intel/fsp_broadwell_de/fsp	string	Channel 1, DIMM 0 SPD File	Path to the file which contains the SPD data for Channel 1, DIMM 0.
FSP_MEMORY_DOWN_CH1DIMM1_SPD_PRESENT	soc/intel/fsp_broadwell_de/fsp	bool	Channel 1, DIMM 1 Present	Select Y if Channel 1, DIMM 1 is present.
FSP_MEMORY_DOWN_CH1DIMM1_SPD_FILE	soc/intel/fsp_broadwell_de/fsp	string	Channel 1, DIMM 1 SPD File	Path to the file which contains the SPD data for Channel 1, DIMM 1.
FSP_HYPERTHREADING	soc/intel/fsp_broadwell_de/fsp	bool	Enable Hyper-Threading	Enable Intel(r) Hyper-Threading Technology for the Broadwell-DE SoC.
FSP_EHCI1_ENABLE	soc/intel/fsp_broadwell_de/fsp	bool	EHCI1 Enable	Enable EHCI controller 1
FSP_EHCI2_ENABLE	soc/intel/fsp_broadwell_de/fsp	bool	EHCI2 Enable	Enable EHCI controller 2
SOC_INTEL_QUARK	soc/intel/quark	bool		Intel Quark support
ENABLE_BUILTIN_HSUART0	soc/intel/quark	bool	Enable built-in HSUART0	The Quark SoC has two HSUART. Choose this option to configure the pads and enable HSUART0, which can be used for the debug console.
ENABLE_BUILTIN_HSUART1	soc/intel/quark	bool	Enable built-in HSUART1	The Quark SoC has two HSUART. Choose this option to configure the pads and enable HSUART1, which can be used for the debug console.
TTYS0_BASE	soc/intel/quark	hex	HSUART Base Address	Memory mapped MMIO of HSUART.
ENABLE_DEBUG_LED	soc/intel/quark	bool		Enable the use of the SD LED for early debugging before serial output is available. Setting this LED indicates that control has reached the desired check point.
ENABLE_DEBUG_LED_ESRAM	soc/intel/quark	bool	SD LED indicates ESRAM initialized	Indicate that ESRAM has been successfully initialized. If the SD LED does not light then the ESRAM initialization needs to be debugged.
ENABLE_DEBUG_LED_FINDFSP	soc/intel/quark	bool	SD LED indicates fsp.bin file was found	Indicate that fsp.bin was found. If the SD LED does not light then the code between ESRAM initialization through find_fsp needs to debugged. Start by verifying that the correct fsp.bin is in the image.
ENABLE_DEBUG_LED_BOOTBLOCK_ENTRY	soc/intel/quark	bool	SD LED indicates bootblock.c successfully entered	Indicate that bootblock_c_entry was entered. If the SD LED does not light then debug the code between ESRAM and bootblock_c_entry. For FSP 1.1, use ENABLE_DEBUG_LED_FINDFSP to split this code.
ENABLE_DEBUG_LED_SOC_EARLY_INIT_ENTRY	soc/intel/quark	bool	SD LED indicates bootblock_soc_early_init successfully entered	Indicate that bootblock_soc_early_init was entered. If the SD LED does not light then debug the code in bootblock_main_with_timestamp.
ENABLE_DEBUG_LED_SOC_EARLY_INIT_EXIT	soc/intel/quark	bool	SD LED indicates bootblock_soc_early_init successfully exited	Indicate that bootblock_soc_early_init exited. If the SD LED does not light then debug the scripts in bootblock_soc_early_init.
ENABLE_DEBUG_LED_SOC_INIT_ENTRY	soc/intel/quark	bool	SD LED indicates bootblock_soc_init successfully entered	Indicate that bootblock_soc_init was entered. If the SD LED does not light then debug the code in bootblock_mainboard_early_init and console_init. If the SD LED does light but there is no serial then debug the serial port configuration and initialization.
DISPLAY_ESRAM_LAYOUT	soc/intel/quark	bool	Display ESRAM layout	Select this option to display coreboot's use of ESRAM.
CBFS_SIZE	soc/intel/quark	hex		Specify the size of the coreboot file system in the read-only (recovery) portion of the flash part. On Quark systems the firmware image stores more than just coreboot, including: - The chipset microcode (RMU) binary file located at 0xFFF00000 - Intel Trusted Execution Engine firmware
ADD_FSP_RAW_BIN	soc/intel/quark	bool	Add the Intel FSP binary to the flash image without relocation	Select this option to add an Intel FSP binary to the resulting coreboot image. Note: Without this binary, coreboot builds relying on the FSP will not boot
FSP_FILE	soc/intel/quark	string	Intel FSP binary path and filename	The path and filename of the Intel FSP binary for this platform.
FSP_LOC	soc/intel/quark	hex		The location in CBFS that the FSP is located. This must match the value that is set in the FSP binary. If the FSP needs to be moved, rebase the FSP with Intel's BCT (tool).
FSP_ESRAM_LOC	soc/intel/quark	hex		The location in ESRAM where a copy of the FSP binary is placed.
RELOCATE_FSP_INTO_DRAM	soc/intel/quark	bool	Relocate FSP into DRAM	Relocate the FSP binary into DRAM before the call to SiliconInit.
ADD_RMU_FILE	soc/intel/quark	bool	Should the RMU binary be added to the flash image?	The RMU file is required to get the chip out of reset.
RMU_FILE	soc/intel/quark	string		The path and filename of the Intel Quark RMU binary.
RMU_LOC	soc/intel/quark	hex		The location in CBFS that the RMU is located. It must match the strap-determined base address.
STORAGE_TEST	soc/intel/quark	bool	Test SD/MMC/eMMC card or device access	Read block 0 from each parition of the storage device. User must also enable one or both of COMMONLIB_STORAGE_SD or COMMONLIB_STORAGE_MMC.
I2C_DEBUG	soc/intel/quark	bool	Enable I2C debugging	Display the I2C segments and controller errors
SOC_INTEL_SKYLAKE	soc/intel/skylake	bool		Intel Skylake support
SOC_INTEL_KABYLAKE	soc/intel/skylake	bool		Intel Kabylake support
DCACHE_RAM_SIZE	soc/intel/skylake	hex		The size of the cache-as-ram region required during bootblock and/or romstage.
DCACHE_BSP_STACK_SIZE	soc/intel/skylake	hex		The amount of anticipated stack usage in CAR by bootblock and other stages.
EXCLUDE_NATIVE_SD_INTERFACE	soc/intel/skylake	bool		If you set this option to n, will not use native SD controller.
PCR_BASE_ADDRESS	soc/intel/skylake	hex		This option allows you to select MMIO Base Address of sideband bus.
SERIRQ_CONTINUOUS_MODE	soc/intel/skylake	bool		If you set this option to y, the serial IRQ machine will be operated in continuous mode.
UART_FOR_CONSOLE	soc/intel/skylake	int	Index for LPSS UART port to use for console	Index for LPSS UART port to use for console: 0 = LPSS UART0, 1 = LPSS UART1, 2 = LPSS UART2
SKYLAKE_SOC_PCH_H	soc/intel/skylake	bool		Choose this option if you have a PCH-H chipset.
NHLT_DMIC_2CH	soc/intel/skylake	bool		Include DSP firmware settings for 2 channel DMIC array.
NHLT_DMIC_4CH	soc/intel/skylake	bool		Include DSP firmware settings for 4 channel DMIC array.
NHLT_NAU88L25	soc/intel/skylake	bool		Include DSP firmware settings for nau88l25 headset codec.
NHLT_MAX98357	soc/intel/skylake	bool		Include DSP firmware settings for max98357 amplifier.
NHLT_MAX98373	soc/intel/skylake	bool		Include DSP firmware settings for max98373 amplifier.
NHLT_SSM4567	soc/intel/skylake	bool		Include DSP firmware settings for ssm4567 smart amplifier.
NHLT_RT5514	soc/intel/skylake	bool		Include DSP firmware settings for rt5514 DSP.
NHLT_RT5663	soc/intel/skylake	bool		Include DSP firmware settings for rt5663 headset codec.
NHLT_MAX98927	soc/intel/skylake	bool		Include DSP firmware settings for max98927 amplifier.
NHLT_DA7219	soc/intel/skylake	bool		Include DSP firmware settings for DA7219 headset codec.
NHLT_DA7219	soc/intel/skylake	bool	Cache-as-ram implementation	This option allows you to select how cache-as-ram (CAR) is set up.
USE_SKYLAKE_CAR_NEM_ENHANCED	soc/intel/skylake	bool	Enhanced Non-evict mode	A current limitation of NEM (Non-Evict mode) is that code and data sizes are derived from the requirement to not write out any modified cache line. With NEM, if there is no physical memory behind the cached area, the modified data will be lost and NEM results will be inconsistent. ENHANCED NEM guarantees that modified data is always kept in cache while clean data is replaced.
USE_SKYLAKE_FSP_CAR	soc/intel/skylake	bool	Use FSP CAR	Use FSP APIs to initialize and tear down the Cache-As-Ram.
SKIP_FSP_CAR	soc/intel/skylake	bool	Skip cache as RAM setup in FSP	Skip Cache as RAM setup in FSP.
NO_FADT_8042	soc/intel/skylake	bool		Choose this option if you want to disable 8042 Keyboard
SOC_INTEL_COMMON	soc/intel/common	bool		common code for Intel SOCs
		(comment)		Intel SoC Common Code
SOC_INTEL_COMMON_BLOCK	soc/intel/common/block	bool		SoC driver for intel common IP code
		(comment)		Intel SoC Common IP Code
SOC_INTEL_COMMON_BLOCK_TIMER	soc/intel/common/block/timer	bool		Intel Processor common TIMER support
SOC_INTEL_COMMON_BLOCK_XDCI	soc/intel/common/block/xdci	bool		Intel Processor common XDCI support
SOC_INTEL_COMMON_BLOCK_SCS	soc/intel/common/block/scs	bool		Intel Processor common storage and communication subsystem support
SOC_INTEL_COMMON_BLOCK_SATA	soc/intel/common/block/sata	bool		Intel Processor common SATA support
SOC_AHCI_PORT_IMPLEMENTED_INVERT	soc/intel/common/block/sata	bool		SATA PCI configuration space offset 0x92 Port implement register bit 0-2 represents respective SATA port enable status as in 0 = Disable; 1 = Enable. If this option is selected then port enable status will be inverted as in 0 = Enable; 1 = Disable.
SOC_INTEL_COMMON_BLOCK_LPC	soc/intel/common/block/lpc	bool		Use common LPC code for platform. Only soc specific code needs to be implemented as per requirement.
SOC_INTEL_COMMON_BLOCK_LPC_COMB_ENABLE	soc/intel/common/block/lpc	bool		By default COMA range to LPC is enable. COMB range to LPC is optional and should select based on platform dedicated selection.
SOC_INTEL_COMMON_BLOCK_SPI	soc/intel/common/block/spi	bool		Intel Processor common SPI support
SOC_INTEL_COMMON_BLOCK_P2SB	soc/intel/common/block/p2sb	bool		Intel Processor common P2SB driver
SOC_INTEL_COMMON_BLOCK_SMM	soc/intel/common/block/smm	bool		Intel Processor common SMM support
SOC_INTEL_COMMON_BLOCK_SMM_IO_TRAP	soc/intel/common/block/smm	bool		Intel Processor trap flag if it is supported
SOC_INTEL_COMMON_BLOCK_SMM_S5_DELAY_MS	soc/intel/common/block/smm	int		Time in milliseconds that SLP_SMI for S5 waits for before enabling sleep. This is required to avoid any race between SLP_SMI and PWRBTN SMI.
SOC_INTEL_COMMON_BLOCK_SA	soc/intel/common/block/systemagent	bool		Intel Processor common System Agent support
SA_PCIEX_LENGTH	soc/intel/common/block/systemagent	hex		This option allows you to select length of PCIEX region.
SA_ENABLE_IMR	soc/intel/common/block/systemagent	bool		This option allows you to add the isolated memory ranges (IMRs).
SA_ENABLE_DPR	soc/intel/common/block/systemagent	bool		This option allows you to add the DMA Protected Range (DPR).
SOC_INTEL_COMMON_BLOCK_HDA	soc/intel/common/block/hda	bool		Intel Processor common High Definition Audio driver support
SOC_INTEL_COMMON_BLOCK_LPSS	soc/intel/common/block/lpss	bool		Intel Processor common LPSS support
SOC_INTEL_COMMON_BLOCK_FAST_SPI	soc/intel/common/block/fast_spi	bool		Intel Processor common FAST_SPI support
FAST_SPI_DISABLE_WRITE_STATUS	soc/intel/common/block/fast_spi	bool	Disable write status SPI opcode	Disable the write status SPI opcode in Intel Fast SPI block.
SOC_INTEL_COMMON_BLOCK_UART	soc/intel/common/block/uart	bool		Intel Processor common UART support
SOC_INTEL_COMMON_BLOCK_UART_LPSS_CLK_M_VAL	soc/intel/common/block/uart	hex		Clock m-divisor value for m/n divider
SOC_INTEL_COMMON_BLOCK_UART_LPSS_CLK_N_VAL	soc/intel/common/block/uart	hex		Clock m-divisor value for m/n divider
SOC_INTEL_COMMON_BLOCK_GSPI	soc/intel/common/block/gspi	bool		Intel Processor Common GSPI support
SOC_INTEL_COMMON_BLOCK_GSPI_CLOCK_MHZ	soc/intel/common/block/gspi	int		The input clock speed into the SPI controller IP block, in MHz. No default is set here as this is an SOC-specific value and must be provided by the SOC.
SOC_INTEL_COMMON_BLOCK_GSPI_MAX	soc/intel/common/block/gspi	int		Maximum number of GSPI controllers supported by the PCH. SoC must define this config if SOC_INTEL_COMMON_BLOCK_GSPI is selected.
SOC_INTEL_COMMON_BLOCK_GSPI_VERSION_2	soc/intel/common/block/gspi	bool		Intel Processor Common GSPI support with quirks to handle SPI_CS_CONTROL changes introduced in CNL.
SOC_INTEL_COMMON_BLOCK_XHCI	soc/intel/common/block/xhci	bool		Intel Processor common XHCI support
SOC_INTEL_COMMON_BLOCK_PCIE	soc/intel/common/block/pcie	bool		Intel Processor common PCIE support
PCIE_DEBUG_INFO	soc/intel/common/block/pcie	bool		Enable debug logs in PCIe module. Allows debug information on memory base and limit, prefetchable memory base and limit, prefetchable memory base upper 32 bits and prefetchable memory limit upper 32 bits.
SOC_INTEL_COMMON_BLOCK_PCR	soc/intel/common/block/pcr	bool		Intel Processor common Private configuration registers (PCR)
PCR_COMMON_IOSF_1_0	soc/intel/common/block/pcr	bool		The mapping of addresses via the SBREG_BAR assumes the IOSF-SB agents are using 32-bit aligned accesses for their configuration registers. For IOSF versions greater than 1_0, IOSF-SB agents can use any access (8/16/32 bit aligned) for their configuration registers
SOC_INTEL_COMMON_BLOCK_ACPI	soc/intel/common/block/acpi	bool		Intel Processor common code for ACPI
SOC_INTEL_COMMON_BLOCK_RTC	soc/intel/common/block/rtc	bool		Intel Processor common RTC support
SOC_INTEL_COMMON_BLOCK_CPU	soc/intel/common/block/cpu	bool		This option selects Intel Common CPU Model support code which provides various CPU related APIs which are common between all Intel Processor families. Common CPU code is supported for SOCs starting from SKL,KBL,APL, and future.
SOC_INTEL_COMMON_BLOCK_CPU_MPINIT	soc/intel/common/block/cpu	bool		This option selects Intel Common CPU MP Init code. In this common MP Init mechanism, the MP Init is occurring before calling FSP Silicon Init. Hence, MP Init will be pulled to BS_DEV_INIT_CHIPS Entry. And on Exit of BS_DEV_INIT, it is ensured that all MTRRs are re-programmed based on the DRAM resource settings.
SOC_INTEL_COMMON_BLOCK_CAR	soc/intel/common/block/cpu	bool		This option allows you to select how cache-as-ram (CAR) is set up.
INTEL_CAR_NEM	soc/intel/common/block/cpu	bool		Traditionally, CAR is set up by using Non-Evict mode. This method does not allow CAR and cache to co-exist, because cache fills are blocked in NEM.
INTEL_CAR_CQOS	soc/intel/common/block/cpu	bool		Cache Quality of Service allows more fine-grained control of cache usage. As result, it is possible to set up a portion of L2 cache for CAR and use the remainder for actual caching.
INTEL_CAR_NEM_ENHANCED	soc/intel/common/block/cpu	bool		A current limitation of NEM (Non-Evict mode) is that code and data sizes are derived from the requirement to not write out any modified cache line. With NEM, if there is no physical memory behind the cached area, the modified data will be lost and NEM results will be inconsistent. ENHANCED NEM guarantees that modified data is always kept in cache while clean data is replaced.
SOC_INTEL_COMMON_BLOCK_CSE	soc/intel/common/block/cse	bool		Driver for communication with Converged Security Engine (CSE) over Host Embedded Controller Interface (HECI)
SOC_INTEL_COMMON_BLOCK_EBDA	soc/intel/common/block/ebda	bool		Intel Processor common EBDA library support
SOC_INTEL_COMMON_BLOCK_PMC	soc/intel/common/block/pmc	bool		Intel Processor common code for Power Management controller(PMC) subsystem
POWER_STATE_OFF_AFTER_FAILURE	soc/intel/common/block/pmc	bool	S5 Soft Off	Choose this option if you want to keep system into S5 after reapplying power after failure
POWER_STATE_ON_AFTER_FAILURE	soc/intel/common/block/pmc	bool	S0 Full On	Choose this option if you want to keep system into S0 after reapplying power after failure
POWER_STATE_PREVIOUS_AFTER_FAILURE	soc/intel/common/block/pmc	bool	Keep Previous State	Choose this option if you want to keep system into same power state as before failure even after reapplying power
PMC_INVALID_READ_AFTER_WRITE	soc/intel/common/block/pmc	bool		Enable this for PMC devices where a read back of ACPI BAR and IO access bit does not return the previously written value.
SOC_INTEL_COMMON_BLOCK_SMBUS	soc/intel/common/block/smbus	bool		Intel Processor common SMBus support
SOC_INTEL_COMMON_BLOCK_GPIO	soc/intel/common/block/gpio	bool		Intel Processor common GPIO support
DEBUG_SOC_COMMON_BLOCK_GPIO	soc/intel/common/block/gpio	bool	Output verbose GPIO debug messages	This option enables GPIO debug messages
SOC_INTEL_COMMON_BLOCK_SGX	soc/intel/common/block/sgx	bool		Software Guard eXtension(SGX) Feature. Intel SGX is a set of new CPU instructions that can be used by applications to set aside private regions of code and data.
SOC_INTEL_COMMON_BLOCK_DSP	soc/intel/common/block/dsp	bool		Intel Processor common DSP support
SOC_INTEL_COMMON_BLOCK_I2C	soc/intel/common/block/i2c	bool		Intel Processor Common I2C support
SOC_INTEL_COMMON_BLOCK_I2C_DEBUG	soc/intel/common/block/i2c	bool	Enable debug output for LPSS I2C transactions	Enable debug output for I2C transactions. This can be useful when debugging I2C drivers.
SOC_INTEL_COMMON_BLOCK_SRAM	soc/intel/common/block/sram	bool		Intel Processor common SRAM support
SOC_INTEL_COMMON_BLOCK_ITSS	soc/intel/common/block/itss	bool		Intel Processor common interrupt timer subsystem support
SOC_INTEL_COMMON_BLOCK_GRAPHICS	soc/intel/common/block/graphics	bool		Intel Processor common Graphics support
ACPI_CONSOLE	soc/intel/common	bool		Provide a mechanism for serial console based ACPI debug.
MMA	soc/intel/common	bool	Enable MMA (Memory Margin Analysis) support for Intel Core	Set this option to y to enable MMA (Memory Margin Analysis) support
TPM_TIS_ACPI_INTERRUPT	soc/intel/common	int		acpi_get_gpe() is used to provide interrupt status to TPM layer. This option specifies the GPE number.
SOC_AMD_STONEYRIDGE_FP4	soc/amd/stoneyridge	bool		AMD Stoney Ridge FP4 support
SOC_AMD_STONEYRIDGE_FT4	soc/amd/stoneyridge	bool		AMD Stoney Ridge FT4 support
DCACHE_BSP_STACK_SIZE	soc/amd/stoneyridge	hex		The amount of anticipated stack usage in CAR by bootblock and other stages.
PRERAM_CBMEM_CONSOLE_SIZE	soc/amd/stoneyridge	hex		Increase this value if preram cbmem console is getting truncated
BOTTOMIO_POSITION	soc/amd/stoneyridge	hex	Bottom of 32-bit IO space	If PCI peripherals with big BARs are connected to the system the bottom of the IO must be decreased to allocate such devices. Declare the beginning of the 128MB-aligned MMIO region. This option is useful when PCI peripherals requesting large address ranges are present.
VGA_BIOS_ID	soc/amd/stoneyridge	string		The default VGA BIOS PCI vendor/device ID should be set to the result of the map_oprom_vendev() function in northbridge.c.
STONEYRIDGE_XHCI_ENABLE	soc/amd/stoneyridge	bool	Enable Stoney Ridge XHCI Controller	The XHCI controller must be enabled and the XHCI firmware must be added in order to have USB 3.0 support configured by coreboot. The OS will be responsible for enabling the XHCI controller if the the XHCI firmware is available but the XHCI controller is not enabled by coreboot.
STONEYRIDGE_XHCI_FWM	soc/amd/stoneyridge	bool	Add xhci firmware	Add Stoney Ridge XHCI Firmware to support the onboard USB 3.0
STONEYRIDGE_IMC_FWM	soc/amd/stoneyridge	bool	Add IMC firmware	Add Stoney Ridge IMC Firmware to support the onboard fan control
STONEYRIDGE_GEC_FWM	soc/amd/stoneyridge	bool		Add Stoney Ridge GEC Firmware to support the onboard gigabit Ethernet MAC. Must be connected to a Broadcom B50610 or B50610M PHY on the motherboard.
STONEYRIDGE_SATA_MODE	soc/amd/stoneyridge	int	SATA Mode	Select the mode in which SATA should be driven. The default is NATIVE. 0: NATIVE mode does not require a ROM. 2: AHCI may work with or without AHCI ROM. It depends on the payload support. For example, seabios does not require the AHCI ROM. 3: LEGACY IDE 4: IDE to AHCI 5: AHCI7804: ROM Required, and AMD driver required in the OS. 6: IDE to AHCI7804: ROM Required, and AMD driver required in the OS.
		(comment)		NATIVE
		(comment)		AHCI
		(comment)		LEGACY IDE
		(comment)		IDE to AHCI
		(comment)		AHCI7804
		(comment)		IDE to AHCI7804
STONEYRIDGE_LEGACY_FREE	soc/amd/stoneyridge	bool	System is legacy free	Select y if there is no keyboard controller in the system. This sets variables in AGESA and ACPI.
SERIRQ_CONTINUOUS_MODE	soc/amd/stoneyridge	bool		Set this option to y for serial IRQ in continuous mode. Otherwise it is in quiet mode.
STONEYRIDGE_ACPI_IO_BASE	soc/amd/stoneyridge	hex		Base address for the ACPI registers. This value must match the hardcoded value of AGESA.
STONEYRIDGE_UART	soc/amd/stoneyridge	bool	UART controller on Stoney Ridge	There are two UART controllers in Stoney Ridge. The UART registers are memory-mapped. UART controller 0 registers range from FEDC_6000h to FEDC_6FFFh. UART controller 1 registers range from FEDC_8000h to FEDC_8FFFh.
USE_PSPSCUREOS	soc/amd/stoneyridge	bool	Include PSP SecureOS blobs in AMD firmware	Include the PspSecureOs, PspTrustlet and TrustletKey binaries in the amdfw section. If unsure, answer 'y'
AMDFW_OUTSIDE_CBFS	soc/amd/stoneyridge	bool	The AMD firmware is outside CBFS	The AMDFW (PSP) is typically locatable in cbfs. Select this option to manually attach the generated amdfw.rom outside of cbfs. The location is selected by the FWM position.
AMD_FWM_POSITION_INDEX	soc/amd/stoneyridge	int	Firmware Directory Table location (0 to 5)	Typically this is calculated by the ROM size, but there may be situations where you want to put the firmware directory table in a different location. 0: 512 KB - 0xFFFA0000 1: 1 MB - 0xFFF20000 2: 2 MB - 0xFFE20000 3: 4 MB - 0xFFC20000 4: 8 MB - 0xFF820000 5: 16 MB - 0xFF020000
		(comment)		AMD Firmware Directory Table set to location for 512KB ROM
		(comment)		AMD Firmware Directory Table set to location for 1MB ROM
		(comment)		AMD Firmware Directory Table set to location for 2MB ROM
		(comment)		AMD Firmware Directory Table set to location for 4MB ROM
		(comment)		AMD Firmware Directory Table set to location for 8MB ROM
		(comment)		AMD Firmware Directory Table set to location for 16MB ROM
MAINBOARD_POWER_RESTORE	soc/amd/stoneyridge	int		This option determines what state to go to once power is restored after having been lost in S0. Select this option to automatically return to S0. Otherwise the system will remain in S5 once power is restored.
VENDORCODE_FULL_SUPPORT	soc/amd/stoneyridge	int		This option determines if all files under vendorcode/amd/pi/00670F00/ will be compiled or only selected procedures of source files (minimum required).
SOC_AMD_COMMON	soc/amd/common	bool		common code for AMD SOCs
SOC_AMD_COMMON_BLOCK	soc/amd/common/block	bool		SoC driver for AMD common IP code
		(comment)		AMD SoC Common IP Code
SOC_AMD_COMMON_BLOCK_S3	soc/amd/common/block/s3	bool		Select this option to add S3 related functions to the build.
SOC_AMD_COMMON_BLOCK_PI	soc/amd/common/block/pi	bool		This option builds functions that interface AMD's AGESA.
SOC_AMD_COMMON_BLOCK_PCI	soc/amd/common/block/pci	bool		This option builds functions used to program PCI interrupt routing, both PIC and APIC modes.
SOC_AMD_COMMON_BLOCK_CAR	soc/amd/common/block/cpu	bool		This option allows the SOC to use a standard AMD cache-as-ram (CAR) implementation. CAR setup is built into bootblock and teardown is in postcar. The teardown procedure does not preserve the stack so it may not be appropriate for a romstage implementation without additional consideration. If this option is not used, the SOC must implement these functions separately.
SOC_AMD_COMMON_BLOCK_PSP	soc/amd/common/block/psp	bool		This option builds in the Platform Security Processor initialization functions.
SOC_AMD_PSP_SELECTABLE_SMU_FW	soc/amd/common/block/psp	bool		Some PSP implementations allow storing SMU firmware into cbfs and calling the PSP to load the blobs at the proper time. The soc/<codename> should select this if its PSP supports the feature and each mainboard can choose to select an appropriate fanless or fanned set of blobs. Ask your AMD representative whether your APU is considered fanless.
CYGNUS_DDR_AUTO_SELF_REFRESH_ENABLE	soc/broadcom/cygnus	bool	Enable DDR auto self-refresh	Warning: M0 expects that auto self-refresh is enabled. Modify with caution.
DEBUG_DRAM	soc/mediatek/mt8173	bool	Output verbose DRAM related debug messages	This option enables additional DRAM related debug messages.
DEBUG_I2C	soc/mediatek/mt8173	bool	Output verbose I2C related debug messages	This option enables I2C related debug messages.
DEBUG_PMIC	soc/mediatek/mt8173	bool	Output verbose PMIC related debug messages	This option enables PMIC related debug messages.
DEBUG_PMIC_WRAP	soc/mediatek/mt8173	bool	Output verbose PMIC WRAP related debug messages	This option enables PMIC WRAP related debug messages.
CONSOLE_SERIAL_MVMAP2315_UART_ADDRESS	soc/marvell/mvmap2315	hex		Map the UART to the respective MMIO address
TTYS0_BAUD	soc/marvell/mvmap2315	int		Baud rate for the UART
IPQ_QFN_PART	soc/qualcomm/ipq40xx	bool		Is the SoC a QFN part (as opposed to a BGA part)
SBL_ELF	soc/qualcomm/ipq40xx	string	file name of the QCA SBL ELF	The path and filename of the binary blob containing ipq40xx early initialization code, as supplied by the vendor.
SBL_UTIL_PATH	soc/qualcomm/ipq40xx	string	Path for utils to combine SBL_ELF and bootblock	Path for utils to combine SBL_ELF and bootblock
SBL_BLOB	soc/qualcomm/ipq806x	string	file name of the Qualcomm SBL blob	The path and filename of the binary blob containing ipq806x early initialization code, as supplied by the vendor.
RK3399_SPREAD_SPECTRUM_DDR	soc/rockchip/rk3399	bool	Spread-spectrum DDR clock	Select Spread Spectrum Modulator (SSMOD) is a fully-digital circuit used to modulate the frequency of the Silicon Creations' Fractional PLL in order to reduce EMI.
		(comment)		CPU
RESET_ON_INVALID_RAMSTAGE_CACHE	cpu/intel/haswell	bool	Reset the system on S3 wake when ramstage cache invalid.	The haswell romstage code caches the loaded ramstage program in SMM space. On S3 wake the romstage will copy over a fresh ramstage that was cached in the SMM space. This option determines the action to take when the ramstage cache is invalid. If selected the system will reset otherwise the ramstage will be reloaded from cbfs.
CPU_INTEL_FIRMWARE_INTERFACE_TABLE	cpu/intel/fit	None		This option selects building a Firmware Interface Table (FIT).
CPU_INTEL_NUM_FIT_ENTRIES	cpu/intel/fit	int		This option selects the number of empty entries in the FIT table.
CPU_INTEL_TURBO_NOT_PACKAGE_SCOPED	cpu/intel/turbo	None		This option indicates that the turbo mode setting is not package scoped. i.e. enable_turbo() needs to be called on not just the bsp
SET_VMX_LOCK_BIT	cpu/intel/common	bool	Set lock bit after configuring VMX	Although the Intel manual says you must set the lock bit in addition to the VMX bit in order for VMX to work, this isn't strictly true, so we have the option to leave it unlocked and allow the OS (e.g. Linux) to manage things itself. This is beneficial for testing purposes as there is no need to reflash the firmware just to toggle the lock bit. However, leaving the lock bit unset will break Windows' detection of VMX support and built-in virtualization features like Hyper-V.
GEODE_VSA_FILE	cpu/amd/geode_lx	bool	Add a VSA image	Select this option if you have an AMD Geode LX vsa that you would like to add to your ROM. You will be able to specify the location and file name of the image later.
VSA_FILENAME	cpu/amd/geode_lx	string	AMD Geode LX VSA path and filename	The path and filename of the file to use as VSA.
XIP_ROM_SIZE	cpu/amd/agesa	hex		Overwride the default write through caching size as 1M Bytes. On some AMD platforms, one socket supports 2 or more kinds of processor family, compiling several CPU families agesa code will increase the romstage size. In order to execute romstage in place on the flash ROM, more space is required to be set as write through caching.
ENABLE_MRC_CACHE	cpu/amd/agesa	bool	Use cached memory configuration	Try to restore memory training results from non-volatile memory.
FORCE_AM1_SOCKET_SUPPORT	cpu/amd/agesa/family16kb	bool		Force AGESA to ignore package type mismatch between CPU and northbridge in memory code. This enables Socket AM1 support with current AGESA version for Kabini platform. Enable this option only if you have Socket AM1 board. Note that the AGESA release shipped with coreboot does not officially support the AM1 socket. Selecting this option might damage your hardware.
XIP_ROM_SIZE	cpu/amd/pi	hex		Overwride the default write through caching size as 1M Bytes. On some AMD platforms, one socket supports 2 or more kinds of processor family, compiling several CPU families agesa code will increase the romstage size. In order to execute romstage in place on the flash ROM, more space is required to be set as write through caching.
PARALLEL_MP	cpu/x86	bool		This option uses common MP infrastructure for bringing up APs in parallel. It additionally provides a more flexible mechanism for sequencing the steps of bringing up the APs.
PARALLEL_MP_AP_WORK	cpu/x86	bool		Allow APs to do other work after initialization instead of going to sleep.
LAPIC_MONOTONIC_TIMER	cpu/x86	bool		Expose monotonic time using the local APIC.
TSC_CONSTANT_RATE	cpu/x86	bool		This option asserts that the TSC ticks at a known constant rate. Therefore, no TSC calibration is required.
TSC_MONOTONIC_TIMER	cpu/x86	bool		Expose monotonic time using the TSC.
TSC_SYNC_LFENCE	cpu/x86	bool		The CPU driver should select this if the CPU needs to execute an lfence instruction in order to synchronize rdtsc. This is true for all modern AMD CPUs.
TSC_SYNC_MFENCE	cpu/x86	bool		The CPU driver should select this if the CPU needs to execute an mfence instruction in order to synchronize rdtsc. This is true for all modern Intel CPUs.
NO_FIXED_XIP_ROM_SIZE	cpu/x86	bool		The XIP_ROM_SIZE Kconfig variable is used globally on x86 with the assumption that all chipsets utilize this value. For the chipsets which do not use the variable it can lead to unnecessary alignment constraints in cbfs for romstage. Therefore, allow those chipsets a path to not be burdened.
SMM_MODULE_HEAP_SIZE	cpu/x86	hex		This option determines the size of the heap within the SMM handler modules.
SERIALIZED_SMM_INITIALIZATION	cpu/x86	bool		On some CPUs, there is a race condition in SMM. This can occur when both hyperthreads change SMM state variables in parallel without coordination. Setting this option serializes the SMM initialization to avoid an ugly hang in the boot process at the cost of a slightly longer boot time.
X86_AMD_FIXED_MTRRS	cpu/x86	bool		This option informs the MTRR code to use the RdMem and WrMem fields in the fixed MTRR MSRs.
PLATFORM_USES_FSP1_0	cpu/x86	bool		Selected for Intel processors/platform combinations that use the Intel Firmware Support Package (FSP) 1.0 for initialization.
MIRROR_PAYLOAD_TO_RAM_BEFORE_LOADING	cpu/x86	bool		On certain platforms a boot speed gain can be realized if mirroring the payload data stored in non-volatile storage. On x86 systems the payload would typically live in a memory-mapped SPI part. Copying the SPI contents to RAM before performing the load can speed up the boot process.
SOC_SETS_MSRS	cpu/x86	bool		The SoC requires different access methods for reading and writing the MSRs. Use SoC specific routines to handle the MSR access.
NO_CAR_GLOBAL_MIGRATION	cpu	bool		This option is selected if there is no need to migrate CAR globals. All stages which use CAR globals can directly access the variables from their linked addresses.
SMP	cpu	bool		This option is used to enable certain functions to make coreboot work correctly on symmetric multi processor (SMP) systems.
AP_SIPI_VECTOR	cpu	hex		This must equal address of ap_sipi_vector from bootblock build.
MMX	cpu	bool		Select MMX in your socket or model Kconfig if your CPU has MMX streaming SIMD instructions. ROMCC can build more efficient code if it can spill to MMX registers.
SSE	cpu	bool		Select SSE in your socket or model Kconfig if your CPU has SSE streaming SIMD instructions. ROMCC can build more efficient code if it can spill to SSE (aka XMM) registers.
SSE2	cpu	bool		Select SSE2 in your socket or model Kconfig if your CPU has SSE2 streaming SIMD instructions. Some parts of coreboot can be built with more efficient code if SSE2 instructions are available.
USES_MICROCODE_HEADER_FILES	cpu	bool		This is selected by a board or chipset to set the default for the microcode source choice to a list of external microcode headers
CPU_MICROCODE_CBFS_GENERATE	cpu	bool	Generate from tree	Select this option if you want microcode updates to be assembled when building coreboot and included in the final image as a separate CBFS file. Microcode will not be hard-coded into ramstage. The microcode file may be removed from the ROM image at a later time with cbfstool, if desired. If unsure, select this option.
CPU_MICROCODE_CBFS_EXTERNAL_HEADER	cpu	bool	Include external microcode header files	Select this option if you want to include external c header files containing the CPU microcode. This will be included as a separate file in CBFS. A word of caution: only select this option if you are sure the microcode that you have is newer than the microcode shipping with coreboot. The microcode file may be removed from the ROM image at a later time with cbfstool, if desired. If unsure, select "Generate from tree"
CPU_MICROCODE_CBFS_NONE	cpu	bool	Do not include microcode updates	Select this option if you do not want CPU microcode included in CBFS. Note that for some CPUs, the microcode is hard-coded into the source tree and is not loaded from CBFS. In this case, microcode will still be updated. There is a push to move all microcode to CBFS, but this change is not implemented for all CPUs. This option currently applies to: - Intel SandyBridge/IvyBridge - VIA Nano Microcode may be added to the ROM image at a later time with cbfstool, if desired. If unsure, select "Generate from tree" The GOOD: Microcode updates intend to solve issues that have been discovered after CPU production. The expected effect is that systems work as intended with the updated microcode, but we have also seen cases where issues were solved by not applying microcode updates. The BAD: Note that some operating system include these same microcode patches, so you may need to also disable microcode updates in your operating system for this option to have an effect. The UGLY: A word of CAUTION: some CPUs depend on microcode updates to function correctly. Not updating the microcode may leave the CPU operating at less than optimal performance, or may cause outright hangups. There are CPUs where coreboot cannot properly initialize the CPU without microcode updates For example, if running with the factory microcode, some Intel SandyBridge CPUs may hang when enabling CAR, or some VIA Nano CPUs will hang when changing the frequency. Make sure you have a way of flashing the ROM externally before selecting this option.
CPU_MICROCODE_MULTIPLE_FILES	cpu	bool		Select this option to install separate microcode container files into CBFS instead of using the traditional monolithic microcode file format.
CPU_MICROCODE_HEADER_FILES	cpu	string	List of space separated microcode header files with the path	A list of one or more microcode header files with path from the coreboot directory. These should be separated by spaces.
CPU_UCODE_BINARIES	cpu	string	Microcode binary path and filename	Some platforms have microcode in the blobs directory, and these can be hardcoded in the makefiles. For platforms with microcode binaries that aren't in the makefile, set this option to pull in the microcode. This should contain the full path of the file for one or more microcode binary files to include, separated by spaces. If unsure, leave this blank.
		(comment)		Northbridge
I945_LVDS	northbridge/intel/i945	string		Selected by mainboards that use native graphics initialization for the LVDS port. A linear framebuffer is only supported for LVDS.
OVERRIDE_CLOCK_DISABLE	northbridge/intel/i945	bool		Usually system firmware turns off system memory clock signals to unused SO-DIMM slots to reduce EMI and power consumption. However, some boards do not like unused clock signals to be disabled.
MAXIMUM_SUPPORTED_FREQUENCY	northbridge/intel/i945	int		If non-zero, this designates the maximum DDR frequency the board supports, despite what the chipset should be capable of.
CHECK_SLFRCS_ON_RESUME	northbridge/intel/i945	int		On some boards it may be neccessary to hard reset early during resume from S3 if the SLFRCS register indicates that a memory channel is not guaranteed to be in self-refresh. On other boards the check always creates a false positive, effectively making it impossible to resume.
USE_NATIVE_RAMINIT	northbridge/intel/sandybridge	bool	Use native raminit	Select if you want to use coreboot implementation of raminit rather than System Agent/MRC.bin. You should answer Y.
NATIVE_RAMINIT_IGNORE_MAX_MEM_FUSES	northbridge/intel/sandybridge	bool	Ignore vendor programmed fuses that limit max. DRAM frequency	Ignore the mainboard's vendor programmed fuses that might limit the maximum DRAM frequency. By selecting this option the fuses will be ignored and the only limits on DRAM frequency are set by RAM's SPD and hard fuses in southbridge's clockgen. Disabled by default as it might causes system instability. Handle with care!
NATIVE_RAMINIT_IGNORE_XMP_MAX_DIMMS	northbridge/intel/sandybridge	bool	Ignore XMP profile max DIMMs per channel	Ignore the max DIMMs per channel restriciton defined in XMP profiles. Disabled by default as it might cause system instability. Handle with care!
MMCONF_BASE_ADDRESS	northbridge/intel/sandybridge	hex		The MRC blob requires it to be at 0xf0000000.
MRC_FILE	northbridge/intel/sandybridge	string	Intel System Agent path and filename	The path and filename of the file to use as System Agent binary.
DCACHE_RAM_SIZE	northbridge/intel/haswell	hex		The size of the cache-as-ram region required during bootblock and/or romstage. Note DCACHE_RAM_SIZE and DCACHE_RAM_MRC_VAR_SIZE must add up to a power of 2.
DCACHE_RAM_MRC_VAR_SIZE	northbridge/intel/haswell	hex		The amount of cache-as-ram region required by the reference code.
DCACHE_RAM_ROMSTAGE_STACK_SIZE	northbridge/intel/haswell	hex		The amount of anticipated stack usage from the data cache during pre-ram ROM stage execution.
HAVE_MRC	northbridge/intel/haswell	bool	Add a System Agent binary	Select this option to add a System Agent binary to the resulting coreboot image. Note: Without this binary coreboot will not work
MRC_FILE	northbridge/intel/haswell	string	Intel System Agent path and filename	The path and filename of the file to use as System Agent binary.
PRE_GRAPHICS_DELAY	northbridge/intel/haswell	int	Graphics initialization delay in ms	On some systems, coreboot boots so fast that connected monitors (mostly TVs) won't be able to wake up fast enough to talk to the VBIOS. On those systems we need to wait for a bit before executing the VBIOS.
VGA_BIOS_ID	northbridge/intel/fsp_sandybridge	string		This is the default PCI ID for the sandybridge/ivybridge graphics devices. This string names the vbios ROM in cbfs. The following PCI IDs will be remapped to load this ROM: 0x80860102, 0x8086010a, 0x80860112, 0x80860116 0x80860122, 0x80860126, 0x80860166
FSP_FILE	northbridge/intel/fsp_sandybridge/fsp	string		The path and filename of the Intel FSP binary for this platform.
FSP_LOC	northbridge/intel/fsp_sandybridge/fsp	hex	Intel FSP Binary location in CBFS	The location in CBFS that the FSP is located. This must match the value that is set in the FSP binary. If the FSP needs to be moved, rebase the FSP with the Intel's BCT (tool). The Ivy Bridge Processor/Panther Point FSP is built with a preferred base address of 0xFFF80000
SDRAMPWR_4DIMM	northbridge/intel/i440bx	bool		This option affects how the SDRAMC register is programmed. Memory clock signals will not be routed properly if this option is set wrong. If your board has 4 DIMM slots, you must use select this option, in your Kconfig file of the board. On boards with 3 DIMM slots, do _not_ select this option.
SET_TSEG_1MB	northbridge/intel/fsp_rangeley	bool	1 MB	Set the TSEG area to 1 MB.
SET_TSEG_2MB	northbridge/intel/fsp_rangeley	bool	2 MB	Set the TSEG area to 2 MB.
SET_TSEG_4MB	northbridge/intel/fsp_rangeley	bool	4 MB	Set the TSEG area to 4 MB.
SET_TSEG_8MB	northbridge/intel/fsp_rangeley	bool	8 MB	Set the TSEG area to 8 MB.
FSP_FILE	northbridge/intel/fsp_rangeley/fsp	string		The path and filename of the Intel FSP binary for this platform.
FSP_LOC	northbridge/intel/fsp_rangeley/fsp	hex		The location in CBFS that the FSP is located. This must match the value that is set in the FSP binary. If the FSP needs to be moved, rebase the FSP with Intel's BCT (tool). The Rangeley FSP is built with a preferred base address of 0xFFF80000
BOTTOMIO_POSITION	northbridge/amd/pi	hex	Bottom of 32-bit IO space	If PCI peripherals with big BARs are connected to the system the bottom of the IO must be decreased to allocate such devices. Declare the beginning of the 128MB-aligned MMIO region. This option is useful when PCI peripherals requesting large address ranges are present.
VGA_BIOS_ID	northbridge/amd/pi/00630F01	string		The default VGA BIOS PCI vendor/device ID should be set to the result of the map_oprom_vendev() function in northbridge.c.
VGA_BIOS_ID	northbridge/amd/pi/00730F01	string		The default VGA BIOS PCI vendor/device ID should be set to the result of the map_oprom_vendev() function in northbridge.c.
VGA_BIOS_ID	northbridge/amd/pi/00660F01	string		The default VGA BIOS PCI vendor/device ID should be set to the result of the map_oprom_vendev() function in northbridge.c.
NO_MMCONF_SUPPORT	northbridge/amd/amdk8	bool		If you want to remove this, you need to make sure any access to CPU nodes 0:18.0, 0:19.0, ... continue to use PCI IO config access.
VGA_BIOS_ID	northbridge/amd/agesa/family16kb	string		The default VGA BIOS PCI vendor/device ID should be set to the result of the map_oprom_vendev() function in northbridge.c.
SVI_HIGH_FREQ	northbridge/amd/amdfam10	bool		Select this for boards with a Voltage Regulator able to operate at 3.4 MHz in SVI mode. Ignored unless the AMD CPU is rev C3.
Menu: HyperTransport setup
SVI_HIGH_FREQ	northbridge/amd/amdfam10	bool	HyperTransport downlink width	This option sets the maximum permissible HyperTransport downlink width. Use of this option will only limit the autodetected HT width. It will not (and cannot) increase the width beyond the autodetected limits. This is primarily used to work around poorly designed or laid out HT traces on certain motherboards.
LIMIT_HT_DOWN_WIDTH_16	northbridge/amd/amdfam10	bool	HyperTransport uplink width	This option sets the maximum permissible HyperTransport uplink width. Use of this option will only limit the autodetected HT width. It will not (and cannot) increase the width beyond the autodetected limits. This is primarily used to work around poorly designed or laid out HT traces on certain motherboards.
		(comment)		Southbridge
SERIRQ_CONTINUOUS_MODE	southbridge/intel/ibexpeak	bool		If you set this option to y, the serial IRQ machine will be operated in continuous mode.
INTEL_LYNXPOINT_LP	southbridge/intel/lynxpoint	bool		Set this option to y for Lynxpont LP (Haswell ULT).
SERIRQ_CONTINUOUS_MODE	southbridge/intel/lynxpoint	bool		If you set this option to y, the serial IRQ machine will be operated in continuous mode.
ME_MBP_CLEAR_LATE	southbridge/intel/lynxpoint	bool	Defer wait for ME MBP Cleared	If you set this option to y, the Management Engine driver will defer waiting for the MBP Cleared indicator until the finalize step. This can speed up boot time if the ME takes a long time to indicate this status.
FINALIZE_USB_ROUTE_XHCI	southbridge/intel/lynxpoint	bool	Route all ports to XHCI controller in finalize step	If you set this option to y, the USB ports will be routed to the XHCI controller during the finalize SMM callback.
SERIRQ_CONTINUOUS_MODE	southbridge/intel/bd82x6x	bool		If you set this option to y, the serial IRQ machine will be operated in continuous mode.
LOCK_SPI_FLASH_RO	southbridge/intel/bd82x6x	bool	Write-protect all flash sections	Select this if you want to write-protect the whole firmware flash chip. The locking will take place during the chipset lockdown, which is either triggered by coreboot (when INTEL_CHIPSET_LOCKDOWN is set) or has to be triggered later (e.g. by the payload or the OS). NOTE: If you trigger the chipset lockdown unconditionally, you won't be able to write to the flash chip using the internal programmer any more.
LOCK_SPI_FLASH_NO_ACCESS	southbridge/intel/bd82x6x	bool	Write-protect all flash sections and read-protect non-BIOS sections	Select this if you want to protect the firmware flash against all further accesses (with the exception of the memory mapped BIOS re- gion which is always readable). The locking will take place during the chipset lockdown, which is either triggered by coreboot (when INTEL_CHIPSET_LOCKDOWN is set) or has to be triggered later (e.g. by the payload or the OS). NOTE: If you trigger the chipset lockdown unconditionally, you won't be able to write to the flash chip using the internal programmer any more.
SERIRQ_CONTINUOUS_MODE	southbridge/intel/fsp_bd82x6x	bool		If you set this option to y, the serial IRQ machine will be operated in continuous mode.
INTEL_CHIPSET_LOCKDOWN	southbridge/intel/common	bool	Lock down chipset in coreboot	Some registers within host bridge on particular chipsets should be locked down on each normal boot path (done by either coreboot or payload) and S3 resume (always done by coreboot). Select this to let coreboot to do this on normal boot path.
SERIRQ_CONTINUOUS_MODE	southbridge/intel/fsp_rangeley	bool		If you set this option to y, the serial IRQ machine will be operated in continuous mode.
IFD_BIN_PATH	southbridge/intel/fsp_rangeley	string		The path and filename to the descriptor.bin file.
SERIRQ_CONTINUOUS_MODE	southbridge/intel/fsp_i89xx	bool		If you set this option to y, the serial IRQ machine will be operated in continuous mode.
HUDSON_XHCI_ENABLE	southbridge/amd/pi/hudson	bool	Enable Hudson XHCI Controller	The XHCI controller must be enabled and the XHCI firmware must be added in order to have USB 3.0 support configured by coreboot. The OS will be responsible for enabling the XHCI controller if the the XHCI firmware is available but the XHCI controller is not enabled by coreboot.
HUDSON_XHCI_FWM	southbridge/amd/pi/hudson	bool	Add xhci firmware	Add Hudson 2/3/4 XHCI Firmware to support the onboard USB 3.0
HUDSON_IMC_FWM	southbridge/amd/pi/hudson	bool	Add IMC firmware	Add Hudson 2/3/4 IMC Firmware to support the onboard fan control
HUDSON_GEC_FWM	southbridge/amd/pi/hudson	bool		Add Hudson 2/3/4 GEC Firmware to support the onboard gigabit Ethernet MAC. Must be connected to a Broadcom B50610 or B50610M PHY on the motherboard.
HUDSON_SATA_MODE	southbridge/amd/pi/hudson	int	SATA Mode	Select the mode in which SATA should be driven. NATIVE AHCI, or RAID. The default is NATIVE. 0: NATIVE mode does not require a ROM. 1: RAID mode must have the two ROM files. 2: AHCI may work with or without AHCI ROM. It depends on the payload support. For example, seabios does not require the AHCI ROM. 3: LEGACY IDE 4: IDE to AHCI 5: AHCI7804: ROM Required, and AMD driver required in the OS. 6: IDE to AHCI7804: ROM Required, and AMD driver required in the OS.
		(comment)		NATIVE
		(comment)		RAID
		(comment)		AHCI
		(comment)		LEGACY IDE
		(comment)		IDE to AHCI
		(comment)		AHCI7804
		(comment)		IDE to AHCI7804
RAID_ROM_ID	southbridge/amd/pi/hudson	string	RAID device PCI IDs	1022,7802 for SATA NON-RAID5 module, 1022,7803 for SATA RAID5 mode
RAID_MISC_ROM_POSITION	southbridge/amd/pi/hudson	hex	RAID Misc ROM Position	The RAID ROM requires that the MISC ROM is located between the range 0xFFF0_0000 to 0xFFF0_FFFF. Also, it must 1K bytes aligned. The CONFIG_ROM_SIZE must be larger than 0x100000.
HUDSON_LEGACY_FREE	southbridge/amd/pi/hudson	bool	System is legacy free	Select y if there is no keyboard controller in the system. This sets variables in AGESA and ACPI.
AZ_PIN	southbridge/amd/pi/hudson	hex		bit 1,0 - pin 0 bit 3,2 - pin 1 bit 5,4 - pin 2 bit 7,6 - pin 3
AMDFW_OUTSIDE_CBFS	southbridge/amd/pi/hudson	hex		The AMDFW (PSP) is typically locatable in cbfs. Select this option to manually attach the generated amdfw.rom at an offset of 0x20000 from the bottom of the coreboot ROM image.
SERIRQ_CONTINUOUS_MODE	southbridge/amd/pi/hudson	bool		Set this option to y for serial IRQ in continuous mode. Otherwise it is in quiet mode.
HUDSON_ACPI_IO_BASE	southbridge/amd/pi/hudson	hex		Base address for the ACPI registers. This value must match the hardcoded value of AGESA.
HUDSON_UART	southbridge/amd/pi/hudson	bool	UART controller on Kern	There are two UART controllers in Kern. The UART registers are memory-mapped. UART controller 0 registers range from FEDC_6000h to FEDC_6FFFh. UART controller 1 registers range from FEDC_8000h to FEDC_8FFFh.
ENABLE_IDE_COMBINED_MODE	southbridge/amd/cimx/sb800	bool	Enable SATA IDE combined mode	If Combined Mode is enabled. IDE controller is exposed and SATA controller has control over Port0 through Port3, IDE controller has control over Port4 and Port5. If Combined Mode is disabled, IDE controller is hidden and SATA controller has full control of all 6 Ports when operating in non-IDE mode.
IDE_COMBINED_MODE	southbridge/amd/cimx/sb800	hex	SATA Mode	Select the mode in which SATA should be driven. NATIVE AHCI, or RAID. The default is AHCI.
SB800_SATA_IDE	southbridge/amd/cimx/sb800	bool	NATIVE	NATIVE does not require a ROM.
SB800_SATA_AHCI	southbridge/amd/cimx/sb800	bool	AHCI	AHCI is the default and may work with or without AHCI ROM. It depends on the payload support. For example, seabios does not require the AHCI ROM.
SB800_SATA_RAID	southbridge/amd/cimx/sb800	bool	RAID	sb800 RAID mode must have the two required ROM files.
RAID_ROM_ID	southbridge/amd/cimx/sb800	string	RAID device PCI IDs	1002,4392 for SATA NON-RAID5 module, 1002,4393 for SATA RAID5 mode
RAID_MISC_ROM_POSITION	southbridge/amd/cimx/sb800	hex	RAID Misc ROM Position	The RAID ROM requires that the MISC ROM is located between the range 0xFFF0_0000 to 0xFFF0_FFFF. Also, it must 1K bytes aligned. The CONFIG_ROM_SIZE must larger than 0x100000.
SB800_IMC_FWM	southbridge/amd/cimx/sb800	bool	Add IMC firmware	Add SB800 / Hudson 1 IMC Firmware to support the onboard fan control.
SB800_FWM_AT_FFFA0000	southbridge/amd/cimx/sb800	bool	0xFFFA0000	The IMC and GEC ROMs requires a 'signature' located at one of several fixed locations in memory. The location used shouldn't matter, just select an area that doesn't conflict with anything else.
SB800_FWM_AT_FFF20000	southbridge/amd/cimx/sb800	bool	0xFFF20000	The IMC and GEC ROMs requires a 'signature' located at one of several fixed locations in memory. The location used shouldn't matter, just select an area that doesn't conflict with anything else.
SB800_FWM_AT_FFE20000	southbridge/amd/cimx/sb800	bool	0xFFE20000	The IMC and GEC ROMs requires a 'signature' located at one of several fixed locations in memory. The location used shouldn't matter, just select an area that doesn't conflict with anything else.
SB800_FWM_AT_FFC20000	southbridge/amd/cimx/sb800	bool	0xFFC20000	The IMC and GEC ROMs requires a 'signature' located at one of several fixed locations in memory. The location used shouldn't matter, just select an area that doesn't conflict with anything else.
SB800_FWM_AT_FF820000	southbridge/amd/cimx/sb800	bool	0xFF820000	The IMC and GEC ROMs requires a 'signature' located at one of several fixed locations in memory. The location used shouldn't matter, just select an area that doesn't conflict with anything else.
EHCI_BAR	southbridge/amd/cimx/sb800	hex	Fan Control	Select the method of SB800 fan control to be used. None would be for either fixed maximum speed fans connected to the SB800 or for an external chip controlling the fan speeds. Manual control sets up the SB800 fan control registers. IMC fan control uses the SB800 IMC to actively control the fan speeds.
SB800_NO_FAN_CONTROL	southbridge/amd/cimx/sb800	bool	None	No SB800 Fan control - Do not set up the SB800 fan control registers.
SB800_MANUAL_FAN_CONTROL	southbridge/amd/cimx/sb800	bool	Manual	Configure the SB800 fan control registers in devicetree.cb.
SB800_IMC_FAN_CONTROL	southbridge/amd/cimx/sb800	bool	IMC Based	Set up the SB800 to use the IMC based Fan controller. This requires the IMC ROM from AMD. Configure the registers in devicetree.cb.
SATA_CONTROLLER_MODE	southbridge/amd/cimx/sb900	hex		0x0 = Native IDE mode. 0x1 = RAID mode. 0x2 = AHCI mode. 0x3 = Legacy IDE mode. 0x4 = IDE->AHCI mode. 0x5 = AHCI mode as 7804 ID (AMD driver). 0x6 = IDE->AHCI mode as 7804 ID (AMD driver).
PCIB_ENABLE	southbridge/amd/cimx/sb900	bool		n = Disable PCI Bridge Device 14 Function 4. y = Enable PCI Bridge Device 14 Function 4.
ACPI_SCI_IRQ	southbridge/amd/cimx/sb900	hex		Set SCI IRQ to 9.
EXT_CONF_SUPPORT	southbridge/amd/sr5650	bool	Enable PCI-E MMCONFIG support	Select to enable PCI-E MMCONFIG support on the SR5650.
EXT_CONF_SUPPORT	southbridge/amd/rs690	bool		Select if RS690 should be setup to support MMCONF.
HUDSON_XHCI_ENABLE	southbridge/amd/agesa/hudson	bool	Enable Hudson XHCI Controller	The XHCI controller must be enabled and the XHCI firmware must be added in order to have USB 3.0 support configured by coreboot. The OS will be responsible for enabling the XHCI controller if the the XHCI firmware is available but the XHCI controller is not enabled by coreboot.
HUDSON_XHCI_FWM	southbridge/amd/agesa/hudson	bool	Add xhci firmware	Add Hudson 2/3/4 XHCI Firmware to support the onboard USB 3.0
HUDSON_IMC_FWM	southbridge/amd/agesa/hudson	bool	Add imc firmware	Add Hudson 2/3/4 IMC Firmware to support the onboard fan control
HUDSON_GEC_FWM	southbridge/amd/agesa/hudson	bool		Add Hudson 2/3/4 GEC Firmware to support the onboard gigabit Ethernet MAC. Must be connected to a Broadcom B50610 or B50610M PHY on the motherboard.
HUDSON_SATA_MODE	southbridge/amd/agesa/hudson	int	SATA Mode	Select the mode in which SATA should be driven. NATIVE AHCI, or RAID. The default is NATIVE. 0: NATIVE mode does not require a ROM. 1: RAID mode must have the two ROM files. 2: AHCI may work with or without AHCI ROM. It depends on the payload support. For example, seabios does not require the AHCI ROM. 3: LEGACY IDE 4: IDE to AHCI 5: AHCI7804: ROM Required, and AMD driver required in the OS. 6: IDE to AHCI7804: ROM Required, and AMD driver required in the OS.
		(comment)		NATIVE
		(comment)		RAID
		(comment)		AHCI
		(comment)		LEGACY IDE
		(comment)		IDE to AHCI
		(comment)		AHCI7804
		(comment)		IDE to AHCI7804
RAID_ROM_ID	southbridge/amd/agesa/hudson	string	RAID device PCI IDs	1022,7802 for SATA NON-RAID5 module, 1022,7803 for SATA RAID5 mode
RAID_MISC_ROM_POSITION	southbridge/amd/agesa/hudson	hex	RAID Misc ROM Position	The RAID ROM requires that the MISC ROM is located between the range 0xFFF0_0000 to 0xFFF0_FFFF. Also, it must 1K bytes aligned. The CONFIG_ROM_SIZE must be larger than 0x100000.
HUDSON_LEGACY_FREE	southbridge/amd/agesa/hudson	bool	System is legacy free	Select y if there is no keyboard controller in the system. This sets variables in AGESA and ACPI.
AZ_PIN	southbridge/amd/agesa/hudson	hex		bit 1,0 - pin 0 bit 3,2 - pin 1 bit 5,4 - pin 2 bit 7,6 - pin 3
SOUTHBRIDGE_AMD_SB700_33MHZ_SPI	southbridge/amd/sb700	bool	Enable high speed SPI clock	When set, the SPI clock will run at 33MHz instead of the compatibility mode 16.5MHz. Note that not all ROMs are capable of 33MHz operation, so you will need to verify this option is appropriate for the ROM you are using.
NO_EARLY_SMBUS	southbridge/amd/cs5536	bool		Skip the CS5536 early SMBUS initialization.
EHCI_BAR	southbridge/amd/sb600	hex	SATA Mode	Select the mode in which SATA should be driven. IDE or AHCI. The default is IDE. config SATA_MODE_IDE bool "IDE" config SATA_MODE_AHCI bool "AHCI"
		(comment)		Super I/O
SUPERIO_ITE_ENV_CTRL_FAN16_CONFIG	superio/ite/common	bool		Enable extended, 16-bit wide tacho counters.
SUPERIO_ITE_ENV_CTRL_8BIT_PWM	superio/ite/common	bool		PWM duty cycles are set in 8-bit registers (instead of 7 bit).
SUPERIO_ITE_ENV_CTRL_PWM_FREQ2	superio/ite/common	bool		The second FAN controller has a separate frequency setting.
		(comment)		Embedded Controllers
EC_ACPI	ec/acpi	bool		ACPI Embedded Controller interface. Mostly found in laptops.
EC_GOOGLE_CHROMEEC	ec/google/chromeec	bool		Google's Chrome EC
EC_GOOGLE_CHROMEEC_ACPI_MEMMAP	ec/google/chromeec	bool		When defined, ACPI accesses EC memmap data on ports 66h/62h. When not defined, the memmap data is instead accessed on 900h-9ffh via the LPC bus.
EC_GOOGLE_CHROMEEC_ACPI_USB_PORT_POWER	ec/google/chromeec	bool		Expose methods for enabling and disabling port power on individual USB ports through the EC.
EC_GOOGLE_CHROMEEC_BOARDID	ec/google/chromeec	bool		Provides common routine for reading boardid from Chrome EC.
EC_GOOGLE_CHROMEEC_I2C	ec/google/chromeec	bool		Google's Chrome EC via I2C bus.
EC_GOOGLE_CHROMEEC_I2C_PROTO3	ec/google/chromeec	bool		Use only proto3 for i2c EC communication.
EC_GOOGLE_CHROMEEC_LPC	ec/google/chromeec	bool		Google Chrome EC via LPC bus.
EC_GOOGLE_CHROMEEC_MEC	ec/google/chromeec	bool		Microchip EC variant for LPC register access.
EC_GOOGLE_CHROMEEC_PD	ec/google/chromeec	bool		Indicates that Google's Chrome USB PD chip is present.
EC_GOOGLE_CHROMEEC_SPI	ec/google/chromeec	bool		Google's Chrome EC via SPI bus.
EC_GOOGLE_CHROMEEC_SPI_WAKEUP_DELAY_US	ec/google/chromeec	int		Force delay after asserting /CS to allow EC to wakeup.
EC_GOOGLE_CHROMEEC_BOARDNAME	ec/google/chromeec	string	Chrome EC board name for EC	The board name used in the Chrome EC code base to build the EC firmware. If set, the coreboot build with also build the EC firmware and add it to the image.
EC_GOOGLE_CHROMEEC_PD_BOARDNAME	ec/google/chromeec	string	Chrome EC board name for PD	The board name used in the Chrome EC code base to build the PD firmware. If set, the coreboot build with also build the EC firmware and add it to the image.
EC_GOOGLE_CHROMEEC_RTC	ec/google/chromeec	bool	Enable Chrome OS EC RTC	Enable support for the real-time clock on the Chrome OS EC. This uses the EC_CMD_RTC_GET_VALUE command to read the current time.
EC_GOOGLE_CHROMEEC_FIRMWARE_NONE	ec/google/chromeec	bool	No EC firmware is included	Disable building and including any EC firmware in the image. config EC_GOOGLE_CHROMEEC_FIRMWARE_EXTERNAL bool "External EC firmware is included" help Include EC firmware binary in the image from an external source. It is expected to be built externally. config EC_GOOGLE_CHROMEEC_FIRMWARE_BUILTIN bool "Builtin EC firmware is included" help Build and include EC firmware binary in the image.
EC_GOOGLE_CHROMEEC_FIRMWARE_FILE	ec/google/chromeec	string	Chrome EC firmware path and filename	The path and filename of the EC firmware file to use.
EC_GOOGLE_CHROMEEC_PD_FIRMWARE_NONE	ec/google/chromeec	bool	No PD firmware is included	Disable building and including any PD firmware in the image. config EC_GOOGLE_CHROMEEC_PD_FIRMWARE_EXTERNAL bool "External PD firmware is included" help Include PD firmware binary in the image from an external source. It is expected to be built externally. config EC_GOOGLE_CHROMEEC_PD_FIRMWARE_BUILTIN bool "Builtin PD firmware is included" help Build and include PD firmware binary in the image.
EC_GOOGLE_CHROMEEC_PD_FIRMWARE_FILE	ec/google/chromeec	string	Chrome EC firmware path and filename for PD	The path and filename of the PD firmware file to use.
EC_GOOGLE_CHROMEEC_SWITCHES	ec/google/chromeec	bool		Enable support for Chrome OS mode switches provided by the Chrome OS EC.
EC_QUANTA_IT8518	ec/quanta/it8518	bool		Interface to QUANTA IT8518 Embedded Controller.
EC_QUANTA_ENE_KB3940Q	ec/quanta/ene_kb3940q	bool		Interface to QUANTA ENE KB3940Q Embedded Controller.
EC_HP_KBC1126	ec/hp/kbc1126	bool		Interface to SMSC KBC1126 embedded controller in HP laptops.
		(comment)		Please select the following otherwise your laptop cannot be powered on.
KBC1126_FIRMWARE	ec/hp/kbc1126	bool	Add firmware images for KBC1126 EC	Select this option to add the two firmware blobs for KBC1126. You need these two blobs to power on your machine.
KBC1126_FW1	ec/hp/kbc1126	string	KBC1126 firmware #1 path and filename	The path and filename of the file to use as KBC1126 firmware #1. You can use util/kbc1126/kbc1126_ec_dump to dump it from the vendor firmware.
KBC1126_FW2	ec/hp/kbc1126	string	KBC1126 filename #2 path and filename	The path and filename of the file to use as KBC1126 firmware #2. You can use util/kbc1126/kbc1126_ec_dump to dump it from the vendor firmware.
H8_BEEP_ON_DEATH	ec/lenovo/h8	bool	Beep on fatal error	Beep when encountered a fatal error.
H8_FLASH_LEDS_ON_DEATH	ec/lenovo/h8	bool	Flash LEDs on fatal error	Flash all LEDs when encountered a fatal error.
H8_SUPPORT_BT_ON_WIFI	ec/lenovo/h8	bool	Support bluetooth on wifi cards	Disable BDC detection and assume bluetooth is installed. Required for bluetooth on wifi cards, as it's not possible to detect it in coreboot.
EC_RODA_IT8518	ec/roda/it8518	bool		Interface to IT8518 embedded controller in Roda notebooks.
EC_SMSC_MEC1308	ec/smsc/mec1308	bool		Shared memory mailbox interface to SMSC MEC1308 Embedded Controller.
EC_PURISM_LIBREM	ec/purism/librem	bool		Purism Librem EC
EC_COMPAL_ENE932	ec/compal/ene932	bool		Interface to COMPAL ENE932 Embedded Controller.
EC_KONTRON_IT8516E	ec/kontron/it8516e	bool		Kontron uses an ITE IT8516E on the KTQM77. Its firmware might come from Fintek (mentioned as Finte*c* somewhere in their Linux driver). The KTQM77 is an embedded board and the IT8516E seems to be only used for fan control and GPIO.
		(comment)		Intel FSP
HAVE_FSP_BIN	drivers/intel/fsp1_0	bool	Use Intel Firmware Support Package	Select this option to add an Intel FSP binary to the resulting coreboot image. Note: Without this binary, coreboot builds relying on the FSP will not boot
FSP_FILE	drivers/intel/fsp1_0	string	Intel FSP binary path and filename	The path and filename of the Intel FSP binary for this platform.
FSP_LOC	drivers/intel/fsp1_0	hex	Intel FSP Binary location in CBFS	The location in CBFS that the FSP is located. This must match the value that is set in the FSP binary. If the FSP needs to be moved, rebase the FSP with Intel's BCT (tool).
ENABLE_FSP_FAST_BOOT	drivers/intel/fsp1_0	bool	Enable Fast Boot	Enabling this feature will force the MRC data to be cached in NV storage to be used for speeding up boot time on future reboots and/or power cycles.
ENABLE_MRC_CACHE	drivers/intel/fsp1_0	bool		Enabling this feature will cause MRC data to be cached in NV storage. This can either be used for fast boot, or just because the FSP wants it to be saved.
MRC_CACHE_FMAP	drivers/intel/fsp1_0	bool	Use MRC Cache in FMAP	Use the region "RW_MRC_CACHE" in FMAP instead of "mrc.cache" in CBFS. You must define a region in your FMAP named "RW_MRC_CACHE".
MRC_CACHE_SIZE	drivers/intel/fsp1_0	hex	Fast Boot Data Cache Size	This is the amount of space in NV storage that is reserved for the fast boot data cache storage. WARNING: Because this area will be erased and re-written, the size should be a full sector of the flash ROM chip and nothing else should be included in CBFS in any sector that the fast boot cache data is in.
VIRTUAL_ROM_SIZE	drivers/intel/fsp1_0	hex	Virtual ROM Size	This is used to calculate the offset of the MRC data cache in NV Storage for fast boot. If in doubt, leave this set to the default which sets the virtual size equal to the ROM size. Example: Cougar Canyon 2 has two 8 MB SPI ROMs. When the SPI ROMs are loaded with a 4 MB coreboot image, the virtual ROM size is 8 MB. When the SPI ROMs are loaded with an 8 MB coreboot image, the virtual ROM size is 16 MB.
CACHE_ROM_SIZE_OVERRIDE	drivers/intel/fsp1_0	hex	Cache ROM Size	This is the size of the cachable area that is passed into the FSP in the early initialization. Typically this should be the size of the CBFS area, but the size must be a power of 2 whereas the CBFS size does not have this limitation.
USE_GENERIC_FSP_CAR_INC	drivers/intel/fsp1_0	bool		The chipset can select this to use a generic cache_as_ram.inc file that should be good for all FSP based platforms.
FSP_USES_UPD	drivers/intel/fsp1_0	bool		If this FSP uses UPD/VPD data regions, select this in the chipset Kconfig.
HAVE_INTEL_FIRMWARE	southbridge/intel/common/firmware	bool		Chipset uses the Intel Firmware Descriptor to describe the layout of the SPI ROM chip.
		(comment)		Intel Firmware
HAVE_IFD_BIN	southbridge/intel/common/firmware	bool	Add Intel descriptor.bin file	The descriptor binary
EM100	southbridge/intel/common/firmware	bool	Configure IFD for EM100 usage	Set SPI frequency to 20MHz and disable Dual Output Fast Read Support
HAVE_ME_BIN	southbridge/intel/common/firmware	bool	Add Intel ME/TXE firmware	The Intel processor in the selected system requires a special firmware for an integrated controller. This might be called the Management Engine (ME), the Trusted Execution Engine (TXE) or something else depending on the chip. This firmware might or might not be available in coreboot's 3rdparty/blobs repository. If it is not and if you don't have access to the firmware from elsewhere, you can still build coreboot without it. In this case however, you'll have to make sure that you don't overwrite your ME/TXE firmware on your flash ROM.
CHECK_ME	southbridge/intel/common/firmware	bool	Verify the integrity of the supplied ME/TXE firmware	Verify the integrity of the supplied Intel ME/TXE firmware before proceeding with the build, in order to prevent an accidental loading of a corrupted ME/TXE image.
USE_ME_CLEANER	southbridge/intel/common/firmware	bool	Strip down the Intel ME/TXE firmware	Use me_cleaner to remove all the non-fundamental code from the Intel ME/TXE firmware. The resulting Intel ME/TXE firmware will have only the code responsible for the very basic hardware initialization, leaving the ME/TXE subsystem essentially in a disabled state. Don't flash a modified ME/TXE firmware and a new coreboot image at the same time, test them in two different steps. WARNING: this tool isn't based on any official Intel documentation but only on reverse engineering and trial & error. See the project's page https://github.com/corna/me_cleaner or the wiki https://github.com/corna/me_cleaner/wiki/How-to-apply-me_cleaner https://github.com/corna/me_cleaner/wiki/How-does-it-work%3F https://github.com/corna/me_cleaner/wiki/me_cleaner-status for more info about this tool If unsure, say N.
		(comment)		Please test the modified ME/TXE firmware and coreboot in two steps
HAVE_GBE_BIN	southbridge/intel/common/firmware	bool	Add gigabit ethernet firmware	The integrated gigabit ethernet controller needs a firmware file. Select this if you are going to use the PCH integrated controller and have the firmware.
HAVE_EC_BIN	southbridge/intel/common/firmware	bool	Add EC firmware	The embedded controller needs a firmware file. Select this if you are going to use the PCH integrated controller and have the EC firmware. EC firmware will be added to final image through ifdtool.
BUILD_WITH_FAKE_IFD	southbridge/intel/common/firmware	bool	Build with a fake IFD	If you don't have an Intel Firmware Descriptor (descriptor.bin) for your board, you can select this option and coreboot will build without it. The resulting coreboot.rom will not contain all parts required to get coreboot running on your board. You can however write only the BIOS section to your board's flash ROM and keep the other sections untouched. Unfortunately the current version of flashrom doesn't support this yet. But there is a patch pending [1]. WARNING: Never write a complete coreboot.rom to your flash ROM if it was built with a fake IFD. It just won't work. [1] http://www.flashrom.org/pipermail/flashrom/2013-June/011083.html
IFD_BIOS_SECTION	southbridge/intel/common/firmware	string	BIOS Region Starting:Ending addresses within the ROM	The BIOS region is typically the size of the CBFS area, and is located at the end of the ROM space. For an 8MB ROM with a 3MB CBFS area, this would look like: 0x00500000:0x007fffff
IFD_ME_SECTION	southbridge/intel/common/firmware	string	ME/TXE Region Starting:Ending addresses within the ROM	The ME/TXE region typically starts at around 0x1000 and often fills the ROM space not used by CBFS. For an 8MB ROM with a 3MB CBFS area, this might look like: 0x00001000:0x004fffff
IFD_GBE_SECTION	southbridge/intel/common/firmware	string	GBE Region Starting:Ending addresses within the ROM	The Gigabit Ethernet ROM region is used when an Intel NIC is built into the Southbridge/SOC and the platform uses this device instead of an external PCIe NIC. It will be located between the ME/TXE and the BIOS region. Leave this empty if you're unsure.
IFD_PLATFORM_SECTION	southbridge/intel/common/firmware	string	Platform Region Starting:Ending addresses within the Rom	The Platform region is used for platform specific data. It will be located between the ME/TXE and the BIOS region. Leave this empty if you're unsure.
LOCK_MANAGEMENT_ENGINE	southbridge/intel/common/firmware	bool	Lock ME/TXE section	The Intel Firmware Descriptor supports preventing write accesses from the host to the ME or TXE section in the firmware descriptor. If the section is locked, it can only be overwritten with an external SPI flash programmer. You will want this if you want to increase security of your ROM image once you are sure that the ME/TXE firmware is no longer going to change. If unsure, say N.
CBFS_SIZE	southbridge/intel/common/firmware	hex		Reduce CBFS size to give room to the IFD blobs.
UDK_VERSION	vendorcode/intel	int		UEFI Development Kit version for Platform
Menu: AMD Platform Initialization
None	vendorcode/amd	None	AGESA source	Select the method for including the AMD Platform Initialization code into coreboot. Platform Initialization code is required for all AMD processors.
CPU_AMD_AGESA_BINARY_PI	vendorcode/amd	bool	binary PI	Use a binary PI package. Generally, these will be stored in the "3rdparty/blobs" directory. For some processors, these must be obtained directly from AMD Embedded Processors Group (http://www.amdcom/embedded).
CPU_AMD_AGESA_OPENSOURCE	vendorcode/amd	bool	open-source AGESA	Build the PI package ("AGESA") from source code in the "vendorcode" directory.
AGESA_BINARY_PI_VENDORCODE_PATH	vendorcode/amd/pi	string	AGESA PI directory path	Specify where to find the AGESA header files for AMD platform initialization.
AGESA_BINARY_PI_FILE	vendorcode/amd/pi	string	AGESA PI binary file name	Specify the binary file to use for AMD platform initialization.
AGESA_BINARY_PI_AS_STAGE	vendorcode/amd/pi	bool	AGESA Binary PI is added as stage to CBFS.	AGESA will be added as a stage utilizing --xip cbfstool options as needed relocating the image to the proper location in memory-mapped cpu address space. It's required that the file be in ELF format containing the relocations necessary for relocating at runtime.
AGESA_SPLIT_MEMORY_FILES	vendorcode/amd/pi	bool	Split AGESA Binary PI into pre- and post-memory files.	Specifies that AGESA is split into two binaries for pre- and post-memory.
AGESA_PRE_MEMORY_BINARY_PI_FILE	vendorcode/amd/pi	string		Specify the binary file to use for pre-memory AMD platform initialization.
AGESA_POST_MEMORY_BINARY_PI_FILE	vendorcode/amd/pi	string		Specify the binary file to use for post-memory AMD platform initialization.
AGESA_BINARY_PI_LOCATION	vendorcode/amd/pi	hex	AGESA PI binary address in ROM	Specify the ROM address at which to store the binary Platform Initialization code.
Menu: ChromeOS
CHROMEOS	vendorcode/google/chromeos	bool	Build for ChromeOS	Enable ChromeOS specific features like the GPIO sub table in the coreboot table. NOTE: Enabling this option on an unsupported board will most likely break your build.
NO_TPM_RESUME	vendorcode/google/chromeos	bool		On some boards the TPM stays powered up in S3. On those boards, booting Windows will break if the TPM resume command is sent during an S3 resume.
HAVE_REGULATORY_DOMAIN	vendorcode/google/chromeos	bool	Add regulatory domain methods	This option is needed to add ACPI regulatory domain methods
CHROMEOS_DISABLE_PLATFORM_HIERARCHY_ON_RESUME	vendorcode/google/chromeos	bool		Disable the platform heirarchy on resume path if the firmware is involved in resume. The hierarchy is disabled prior to jumping to the OS. Note that this option is sepcific to TPM2 boards. This option is auto selected if CHROMEOS because it matches with vboot_reference model which disables the platform hierarchy in the boot loader. However, those operations need to be symmetric on normal boot as well as resume and coreboot is only involved in the resume piece w.r.t. the platform hierarchy.
GOOGLE_SMBIOS_MAINBOARD_VERSION	vendorcode/google	bool		Provide a common implementation for mainboard version, which returns a formatted 'rev%d' board_id() string.
ARCH_RISCV_COMPRESSED	arch/riscv	bool		Enable this option if your RISC-V processor supports compressed instructions (RVC). Currently, this enables RVC for all stages.
ARCH_ARMV8_EXTENSION	arch/arm64/armv8	int		Specify ARMv8 extension, for example '1' for ARMv8.1, to control the '-march' option passed into the compiler. Defaults to 0 for vanilla ARMv8 but may be overridden in the SoC's Kconfig. All ARMv8 implementations are downwards-compatible, so this does not need to be changed unless specific features (e.g. new instructions) are used by the SoC's coreboot code.
ARM64_SECURE_OS_FILE	arch/arm64	string	Secure OS binary file	Secure OS binary file.
ARM64_A53_ERRATUM_843419	arch/arm64	bool		Some early Cortex-A53 revisions had a hardware bug that results in incorrect address calculations in rare cases. This option enables a linker workaround to avoid those cases if your toolchain supports it. Should be selected automatically by SoCs that are affected.
USE_MARCH_586	arch/x86	bool		Allow a platform or processor to select to be compiled using the '-march=i586' option instead of the typical '-march=i686'
CBMEM_TOP_BACKUP	arch/x86	bool		Platform implements non-volatile storage to cache cbmem_top() over stage transitions and optionally also over S3 suspend.
LATE_CBMEM_INIT	arch/x86	bool		Enable this in chipset's Kconfig if northbridge does not implement early cbmem_top() call for romstage. CBMEM tables will be allocated late in ramstage, after PCI devices resources are known. WARNING: Late CBMEM initialization is deprecated. Platforms that don't support early CBMEM initialization will be removed after the release of coreboot 4.7.
PRERAM_CBMEM_CONSOLE_SIZE	arch/x86	hex		Increase this value if preram cbmem console is getting truncated
EARLY_EBDA_INIT	arch/x86	bool		Initialize BIOS EBDA area early in romstage to allow bootloader to use this region for storing data which can be available across various stages. If user is selecting this option then its users responsibility to perform EBDA initialization call during romstage.
BOOTBLOCK_DEBUG_SPINLOOP	arch/x86	bool		Add a spin (JMP .) in bootblock_crt0.S during early bootblock to wait for a JTAG debugger to break into the execution sequence.
BOOTBLOCK_SAVE_BIST_AND_TIMESTAMP	arch/x86	bool		Select this value to provide a routine to save the BIST and timestamp values. The default code places the BIST value in MM0 and the timestamp value in MM2:MM1. Another file is necessary when the CPU does not support the MMx register set.
VERSTAGE_DEBUG_SPINLOOP	arch/x86	bool		Add a spin (JMP .) in assembly_entry.S during early verstage to wait for a JTAG debugger to break into the execution sequence.
ROMSTAGE_DEBUG_SPINLOOP	arch/x86	bool		Add a spin (JMP .) in assembly_entry.S during early romstage to wait for a JTAG debugger to break into the execution sequence.
SKIP_MAX_REBOOT_CNT_CLEAR	arch/x86	bool	Do not clear reboot count after successful boot	Do not clear the reboot count immediately after successful boot. Set to allow the payload to control normal/fallback image recovery. Note that it is the responsibility of the payload to reset the normal boot bit to 1 after each successsful boot.
ACPI_CPU_STRING	arch/x86	string		Sets the ACPI name string in the processor scope as written by the acpigen function. Default is \_PR.CPxx. Note that you need the \ escape character in the string.
COLLECT_TIMESTAMPS_NO_TSC	arch/x86	bool		Use a non-TSC platform-dependent source for timestamps.
COLLECT_TIMESTAMPS_TSC	arch/x86	bool		Use the TSC as the timestamp source.
PAGING_IN_CACHE_AS_RAM	arch/x86	bool		Chipsets scan select this option to preallocate area in cache-as-ram for storing paging data structures. PAE paging is currently the only thing being supported.
NUM_CAR_PAGE_TABLE_PAGES	arch/x86	int		The number of 4KiB pages that should be pre-allocated for page tables.
Menu: Devices
HAVE_VGA_TEXT_FRAMEBUFFER	device	bool		Selected by graphics drivers that support legacy VGA text mode.
HAVE_VBE_LINEAR_FRAMEBUFFER	device	bool		Selected by graphics drivers that can set up a VBE linear-framebuffer mode.
HAVE_LINEAR_FRAMEBUFFER	device	bool		Selected by graphics drivers that can set up a generic linear framebuffer.
HAVE_FSP_GOP	device	bool		Selected by drivers that support to run a blob that implements the Graphics Output Protocol (GOP).
MAINBOARD_HAS_NATIVE_VGA_INIT	device	bool		Selected by mainboards / drivers that provide native graphics init within coreboot.
MAINBOARD_FORCE_NATIVE_VGA_INIT	device	bool		Selected by mainboards / chipsets whose graphics driver can't or shouldn't be disabled.
MAINBOARD_HAS_LIBGFXINIT	device	bool		Selected by mainboards that implement support for `libgfxinit`. Usually this requires a list of ports to be probed for displays.
MAINBOARD_DO_NATIVE_VGA_INIT	device	bool	Use native graphics init	Some mainboards, such as the Google Link, allow initializing the display without the need of a binary only VGA OPROM. Enabling this option may be faster, but also lacks flexibility in setting modes.
MAINBOARD_USE_LIBGFXINIT	device	bool	Use libgfxinit	Use the SPARK library `libgfxinit` for the native graphics initialization. This requires an Ada toolchain.
VGA_ROM_RUN	device	bool	Run VGA Option ROMs	Execute VGA Option ROMs in coreboot if found. This can be used to enable PCI/AGP/PCI-E video cards when not using a SeaBIOS payload. When using a SeaBIOS payload it runs all option ROMs with much more complete BIOS interrupt services available than coreboot, which some option ROMs require in order to function correctly.
RUN_FSP_GOP	device	bool	Run a GOP driver	Some platforms (e.g. Intel Braswell and Skylake/Kaby Lake) support to run a GOP blob. This option enables graphics initialization with such a blob.
NO_GFX_INIT	device	bool	None	Select this to not perform any graphics initialization in coreboot. This is useful if the payload (e.g. SeaBIOS) can initialize graphics or if pre-boot graphics are not required.
S3_VGA_ROM_RUN	device	bool	Re-run VGA Option ROMs on S3 resume	Execute VGA Option ROMs in coreboot when resuming from S3 suspend. When using a SeaBIOS payload it runs all option ROMs with much more complete BIOS interrupt services available than coreboot, which some option ROMs require in order to function correctly. If unsure, say N when using SeaBIOS as payload, Y otherwise.
ALWAYS_LOAD_OPROM	device	bool		Always load option ROMs if any are found. The decision to run the ROM is still determined at runtime, but the distinction between loading and not running comes into play for CHROMEOS. An example where this is required is that VBT (Video BIOS Tables) are needed for the kernel's display driver to know how a piece of hardware is configured to be used.
ALWAYS_RUN_OPROM	device	bool		Always uncondtionally run the option regardless of other policies.
ON_DEVICE_ROM_LOAD	device	bool	Load Option ROMs on PCI devices	Load Option ROMs stored on PCI/PCIe/AGP VGA devices in coreboot. If disabled, only Option ROMs stored in CBFS will be executed by coreboot. If you are concerned about security, you might want to disable this option, but it might leave your system in a state of degraded functionality. When using a SeaBIOS payload it runs all option ROMs with much more complete BIOS interrupt services available than coreboot, which some option ROMs require in order to function correctly. If unsure, say N when using SeaBIOS as payload, Y otherwise.
PCI_OPTION_ROM_RUN_REALMODE	device	bool	Native mode	If you select this option, PCI Option ROMs will be executed natively on the CPU in real mode. No CPU emulation is involved, so this is the fastest, but also the least secure option. (only works on x86/x64 systems)
PCI_OPTION_ROM_RUN_YABEL	device	bool	Secure mode	If you select this option, the x86emu CPU emulator will be used to execute PCI Option ROMs. This option prevents Option ROMs from doing dirty tricks with the system (such as installing SMM modules or hypervisors), but it is also significantly slower than the native Option ROM initialization method. This is the default choice for non-x86 systems.
YABEL_PCI_ACCESS_OTHER_DEVICES	device	bool	Allow Option ROMs to access other devices	Per default, YABEL only allows Option ROMs to access the PCI device that they are associated with. However, this causes trouble for some onboard graphics chips whose Option ROM needs to reconfigure the north bridge.
YABEL_PCI_FAKE_WRITING_OTHER_DEVICES_CONFIG	device	bool	Fake success on writing other device's config space	By default, YABEL aborts when the Option ROM tries to write to other devices' config spaces. With this option enabled, the write doesn't follow through, but the Option ROM is allowed to go on. This can create issues such as hanging Option ROMs (if it depends on that other register changing to the written value), so test for impact before using this option.
YABEL_VIRTMEM_LOCATION	device	hex	Location of YABEL's virtual memory	YABEL requires 1MB memory for its CPU emulation. This memory is normally located at 16MB.
YABEL_DIRECTHW	device	bool	Direct hardware access	YABEL consists of two parts: It uses x86emu for the CPU emulation and additionally provides a PC system emulation that filters bad device and memory access (such as PCI config space access to other devices than the initialized one). When choosing this option, x86emu will pass through all hardware accesses to memory and I/O devices to the underlying memory and I/O addresses. While this option prevents Option ROMs from doing dirty tricks with the CPU (such as installing SMM modules or hypervisors), they can still access all devices in the system. Enable this option for a good compromise between security and speed.
Menu: Display
FRAMEBUFFER_SET_VESA_MODE	device	bool	Set framebuffer graphics resolution	Set VESA/native framebuffer mode (needed for bootsplash and graphical framebuffer console)
FRAMEBUFFER_SET_VESA_MODE	device	bool	framebuffer graphics resolution	This option sets the resolution used for the coreboot framebuffer (and bootsplash screen).
BOOTSPLASH	device	bool	Show graphical bootsplash	This option shows a graphical bootsplash screen. The graphics are loaded from the CBFS file bootsplash.jpg. You can either specify the location and file name of the image in the 'General' section or add it manually to CBFS, using, for example, cbfstool.
VGA_TEXT_FRAMEBUFFER	device	bool	Legacy VGA text mode	If this option is enabled, coreboot will initialize graphics in legacy VGA text mode or, if a VGA BIOS is used and a VESA mode set, switch to text mode before handing control to a payload.
VBE_LINEAR_FRAMEBUFFER	device	bool	VESA framebuffer	This option keeps the framebuffer mode set after coreboot finishes execution. If this option is enabled, coreboot will pass a framebuffer entry in its coreboot table and the payload will need a compatible driver.
GENERIC_LINEAR_FRAMEBUFFER	device	bool	Linear \"high-resolution\" framebuffer	This option enables a high-resolution, linear framebuffer. If this option is enabled, coreboot will pass a framebuffer entry in its coreboot table and the payload will need a compatible driver.
PCIEXP_COMMON_CLOCK	device	bool	Enable PCIe Common Clock	Detect and enable Common Clock on PCIe links.
PCIEXP_ASPM	device	bool	Enable PCIe ASPM	Detect and enable ASPM (Active State Power Management) on PCIe links.
PCIEXP_CLK_PM	device	bool	Enable PCIe Clock Power Management	Detect and enable Clock Power Management on PCIe.
PCIEXP_L1_SUB_STATE	device	bool	Enable PCIe ASPM L1 SubState	Detect and enable ASPM on PCIe links.
EARLY_PCI_BRIDGE	device	bool	Early PCI bridge	While coreboot is executing code from ROM, the coreboot resource allocator has not been running yet. Hence PCI devices living behind a bridge are not yet visible to the system. This option enables static configuration for a single pre-defined PCI bridge function on bus 0.
SUBSYSTEM_VENDOR_ID	device	hex	Override PCI Subsystem Vendor ID	This config option will override the devicetree settings for PCI Subsystem Vendor ID.
SUBSYSTEM_DEVICE_ID	device	hex	Override PCI Subsystem Device ID	This config option will override the devicetree settings for PCI Subsystem Device ID.
VGA_BIOS	device	bool	Add a VGA BIOS image	Select this option if you have a VGA BIOS image that you would like to add to your ROM. You will be able to specify the location and file name of the image later.
VGA_BIOS_FILE	device	string	VGA BIOS path and filename	The path and filename of the file to use as VGA BIOS.
VGA_BIOS_ID	device	string	VGA device PCI IDs	The comma-separated PCI vendor and device ID that would associate your VGA BIOS to your video card. Example: 1106,3230 In the above example 1106 is the PCI vendor ID (in hex, but without the "0x" prefix) and 3230 specifies the PCI device ID of the video card (also in hex, without "0x" prefix). Under GNU/Linux you can run `lspci -nn` to list the IDs of your PCI devices.
INTEL_GMA_ADD_VBT_DATA_FILE	device	bool	Add a Video Bios Table (VBT) binary to CBFS	Add a VBT data file to CBFS. The VBT describes the integrated GPU and connections, and is needed by the GOP driver integrated into FSP and the OS driver in order to initialize the display.
INTEL_GMA_VBT_FILE	device	string	VBT binary path and filename	The path and filename of the VBT binary.
SOFTWARE_I2C	device	bool	Enable I2C controller emulation in software	This config option will enable code to override the i2c_transfer routine with a (simple) software emulation of the protocol. This may be useful for debugging or on platforms where a driver for the real I2C controller is not (yet) available. The platform code needs to provide bindings to manually toggle I2C lines.
Menu: Generic Drivers
ELOG	drivers/elog	bool	Support for flash based event log	Enable support for flash based event logging.
ELOG_CBMEM	drivers/elog	bool	Store a copy of ELOG in CBMEM	This option will have ELOG store a copy of the flash event log in a CBMEM region and export that address in SMBIOS to the OS. This is useful if the ELOG location is not in memory mapped flash, but it means that events added at runtime via the SMI handler will not be reflected in the CBMEM copy of the log.
ELOG_GSMI	drivers/elog	bool	SMI interface to write and clear event log	This interface is compatible with the linux kernel driver available with CONFIG_GOOGLE_GSMI and can be used to write kernel reset/shutdown messages to the event log.
ELOG_BOOT_COUNT	drivers/elog	bool	Maintain a monotonic boot number in CMOS	Store a monotonic boot number in CMOS and provide an interface to read the current value and increment the counter. This boot counter will be logged as part of the System Boot event.
ELOG_BOOT_COUNT_CMOS_OFFSET	drivers/elog	int	Offset in CMOS to store the boot count	This value must be greater than 16 bytes so as not to interfere with the standard RTC region. Requires 8 bytes.
USBDEBUG	drivers/usb	bool	USB 2.0 EHCI debug dongle support	This option allows you to use a so-called USB EHCI Debug device (such as the Ajays NET20DC, AMIDebug RX, or a system using the Linux "EHCI Debug Device gadget" driver found in recent kernel) to retrieve the coreboot debug messages (instead, or in addition to, a serial port). This feature is NOT supported on all chipsets in coreboot! It also requires a USB2 controller which supports the EHCI Debug Port capability. See https://www.coreboot.org/EHCI_Debug_Port for an up-to-date list of supported controllers. If unsure, say N.
USBDEBUG_IN_ROMSTAGE	drivers/usb	bool	Enable early (pre-RAM) usbdebug	Configuring USB controllers in system-agent binary may cause problems to usbdebug. Disabling this option delays usbdebug to be setup on entry to ramstage. If unsure, say Y.
USBDEBUG_HCD_INDEX	drivers/usb	int	Index for EHCI controller to use with usbdebug	Some boards have multiple EHCI controllers with possibly only one having the Debug Port capability on an external USB port. Mapping of this index to PCI device functions is southbridge specific and mainboard level Kconfig should already provide a working default value here.
USBDEBUG_DEFAULT_PORT	drivers/usb	int	Default USB port to use as Debug Port	Selects which physical USB port usbdebug dongle is connected to. Setting of 0 means to scan possible ports starting from 1. Intel platforms have hardwired the debug port location and this setting makes no difference there. Hence, if you select the correct port here, you can speed up your boot time. Which USB port number refers to which actual port on your mainboard (potentially also USB pin headers on your mainboard) is highly board-specific, and you'll likely have to find out by trial-and-error.
USBDEBUG_DONGLE_STD	drivers/usb	bool	USB gadget driver or Net20DC	Net20DC, BeagleBone Black, Raspberry Pi Zero W
USBDEBUG_DONGLE_BEAGLEBONE	drivers/usb	bool	BeagleBone	Use this to configure the USB hub on BeagleBone board. Do NOT select this for the BeagleBone Black.
USBDEBUG_DONGLE_FTDI_FT232H	drivers/usb	bool	FTDI FT232H UART	Use this with FT232H usb-to-uart. Configuration is hard-coded to use 8n1, no flow control.
USBDEBUG_DONGLE_FTDI_FT232H_BAUD	drivers/usb	int	FTDI FT232H baud rate	Select baud rate for FT232H in the range 733..12,000,000. Make sure that your receiving side supports the same setting and your connection works with it. Multiples of 115,200 seem to be a good choice, and EHCI debug usually can't saturate more than 576,000.
COMMON_CBFS_SPI_WRAPPER	drivers/spi	bool		Use common wrapper to interface CBFS to SPI bootrom.
SPI_FLASH	drivers/spi	bool		Select this option if your chipset driver needs to store certain data in the SPI flash.
BOOT_DEVICE_SPI_FLASH_BUS	drivers/spi	int		Which SPI bus the boot device is connected to.
BOOT_DEVICE_SPI_FLASH_RW_NOMMAP	drivers/spi	bool		Provide common implementation of the RW boot device that doesn't provide mmap() operations.
BOOT_DEVICE_SPI_FLASH_RW_NOMMAP_EARLY	drivers/spi	bool		Include the common implementation in all stages, including the early ones.
SPI_FLASH_SMM	drivers/spi	bool	SPI flash driver support in SMM	Select this option if you want SPI flash support in SMM.
SPI_FLASH_NO_FAST_READ	drivers/spi	bool	Disable Fast Read command	Select this option if your setup requires to avoid "fast read"s from the SPI flash parts.
SPI_FLASH_ADESTO	drivers/spi	bool		Select this option if your chipset driver needs to store certain data in the SPI flash and your SPI flash is made by Adesto Technologies.
SPI_FLASH_AMIC	drivers/spi	bool		Select this option if your chipset driver needs to store certain data in the SPI flash and your SPI flash is made by AMIC.
SPI_FLASH_ATMEL	drivers/spi	bool		Select this option if your chipset driver needs to store certain data in the SPI flash and your SPI flash is made by Atmel.
SPI_FLASH_EON	drivers/spi	bool		Select this option if your chipset driver needs to store certain data in the SPI flash and your SPI flash is made by EON.
SPI_FLASH_GIGADEVICE	drivers/spi	bool		Select this option if your chipset driver needs to store certain data in the SPI flash and your SPI flash is made by Gigadevice.
SPI_FLASH_MACRONIX	drivers/spi	bool		Select this option if your chipset driver needs to store certain data in the SPI flash and your SPI flash is made by Macronix.
SPI_FLASH_SPANSION	drivers/spi	bool		Select this option if your chipset driver needs to store certain data in the SPI flash and your SPI flash is made by Spansion.
SPI_FLASH_SST	drivers/spi	bool		Select this option if your chipset driver needs to store certain data in the SPI flash and your SPI flash is made by SST.
SPI_FLASH_STMICRO	drivers/spi	bool		Select this option if your chipset driver needs to store certain data in the SPI flash and your SPI flash is made by ST MICRO.
SPI_FLASH_WINBOND	drivers/spi	bool		Select this option if your chipset driver needs to store certain data in the SPI flash and your SPI flash is made by Winbond.
SPI_FLASH_FAST_READ_DUAL_OUTPUT_3B	drivers/spi	bool		Select this option if your SPI flash supports the fast read dual- output command (opcode 0x3b) where the opcode and address are sent to the chip on MOSI and data is received on both MOSI and MISO.
SPI_FLASH_HAS_VOLATILE_GROUP	drivers/spi	bool		Allows chipset to group write/erase operations under a single volatile group.
CACHE_MRC_SETTINGS	drivers/mrc_cache	bool		Save cached MRC settings
MRC_WRITE_NV_LATE	drivers/mrc_cache	bool		MRC settings are normally written to NVRAM at BS_DEV_ENUMERATE-EXIT. If a platform requires MRC settings written to NVRAM later than normal, select this item. This will cause the write to occur at BS_OS_RESUME_CHECK-ENTRY.
DIGITIZER_AUTODETECT	drivers/lenovo	bool	Autodetect	The presence of digitizer is inferred from model number stored in AT24RF chip.
DIGITIZER_PRESENT	drivers/lenovo	bool	Present	The digitizer is assumed to be present.
DIGITIZER_ABSENT	drivers/lenovo	bool	Absent	The digitizer is assumed to be absent.
UART_OVERRIDE_INPUT_CLOCK_DIVIDER	drivers/uart	boolean		Set to "y" when the platform overrides the uart_input_clock_divider routine.
UART_OVERRIDE_REFCLK	drivers/uart	boolean		Set to "y" when the platform overrides the uart_platform_refclk routine.
DRIVERS_UART_OXPCIE	drivers/uart	bool	Oxford OXPCIe952	Support for Oxford OXPCIe952 serial port PCIe cards. Currently only devices with the vendor ID 0x1415 and device ID 0xc158 or 0xc11b will work.
UART_USE_REFCLK_AS_INPUT_CLOCK	drivers/uart	bool		Use uart_platform_refclk to specify the input clock value.
UART_PCI_ADDR	drivers/uart	hex	UART's PCI bus, device, function address	Specify zero if the UART is connected to another bus type. For PCI based UARTs, build the value as: 1 << 31 - Valid bit, PCI UART in use Bus << 20 Device << 15 Function << 12
GIC	drivers/gic	None		This option enables GIC support, the ARM generic interrupt controller.
REALTEK_8168_RESET	drivers/net	bool		This forces a realtek 10ec:8168 card to reset to ensure power state is correct at boot.
REALTEK_8168_MACADDRESS	drivers/net	string	Realtek rt8168 mac address	This is a string to set the mac address on a Realtek rt8168 card. It must be in the form of "xx:xx:xx:xx:xx:xx", where x is a hexadecimal number for it to be valid. Failing to do so will result in the default macaddress being used.
RT8168_SET_LED_MODE	drivers/net	bool		This is to set a customized LED mode to distinguish 10/100/1000 link and speed status with limited LEDs avaiable on a board. Please refer to RTL811x datasheet section 7.2 Customizable LED Configuration for details. With this flag enabled, the customized_leds variable will be read from devicetree setting.
DRIVERS_PS2_KEYBOARD	drivers/pc80/pc	bool	PS/2 keyboard init	Enable this option to initialize PS/2 keyboards found connected to the PS/2 port. Some payloads (eg, filo) require this option. Other payloads (eg, GRUB 2, SeaBIOS, Linux) do not require it. Initializing a PS/2 keyboard can take several hundred milliseconds. If you know you will only use a payload which does not require this option, then you can say N here to speed up boot time. Otherwise say Y.
VGA	drivers/pc80/vga	bool		Include legacy VGA support code.
LPC_TPM	drivers/pc80/tpm	bool	Enable TPM support	Enable this option to enable LPC TPM support in coreboot. If unsure, say N.
TPM_TIS_BASE_ADDRESS	drivers/pc80/tpm	hex		This can be used to adjust the TPM memory base address. The default is specified by the TCG PC Client Specific TPM Interface Specification 1.2 and should not be changed unless the TPM being used does not conform to TPM TIS 1.2.
TPM_PIRQ	drivers/pc80/tpm	hex		This can be used to specify a PIRQ to use instead of SERIRQ, which is needed for SPI TPM interrupt support on x86.
TPM_INIT_FAILURE_IS_FATAL	drivers/pc80/tpm	bool		What to do if TPM init failed. If true, force a hard reset, otherwise just log error message to console.
SKIP_TPM_STARTUP_ON_NORMAL_BOOT	drivers/pc80/tpm	bool		Skip TPM init on normal boot. Useful if payload does TPM init.
TPM_DEACTIVATE	drivers/pc80/tpm	bool	Deactivate TPM	Deactivate TPM by issuing deactivate command.
TPM_RDRESP_NEED_DELAY	drivers/pc80/tpm	bool	Enable Delay Workaround for TPM	Certain TPMs seem to need some delay when reading response to work around a race-condition-related issue, possibly caused by ill-programmed TPM firmware.
PLATFORM_USES_FSP1_1	drivers/intel/fsp1_1	bool		Does the code require the Intel Firmware Support Package?
		(comment)		Intel FSP 1.1
HAVE_FSP_BIN	drivers/intel/fsp1_1	bool	Should the Intel FSP binary be added to the flash image	Select this option to add an Intel FSP binary to the resulting coreboot image. Note: Without this binary, coreboot builds relying on the FSP will not boot
CPU_MICROCODE_CBFS_LEN	drivers/intel/fsp1_1	hex	Microcode update region length in bytes	The length in bytes of the microcode update region.
CPU_MICROCODE_CBFS_LOC	drivers/intel/fsp1_1	hex	Microcode update base address in CBFS	The location (base address) in CBFS that contains the microcode update binary.
FSP_FILE	drivers/intel/fsp1_1	string	Intel FSP binary path and filename	The path and filename of the Intel FSP binary for this platform.
FSP_LOC	drivers/intel/fsp1_1	hex	Intel FSP Binary location in CBFS	The location in CBFS that the FSP is located. This must match the value that is set in the FSP binary. If the FSP needs to be moved, rebase the FSP with Intel's BCT (tool).
DISPLAY_UPD_DATA	drivers/intel/fsp1_1	bool	Display UPD data	Display the user specified product data prior to memory initialization.
FSP_USES_UPD	drivers/intel/fsp1_1	bool		If this FSP uses UPD/VPD data regions, select this in the chipset Kconfig.
USE_GENERIC_FSP_CAR_INC	drivers/intel/fsp1_1	bool		The chipset can select this to use a generic cache_as_ram.inc file that should be good for all FSP based platforms.
INTEL_DDI	drivers/intel/gma	bool		helper functions for intel DDI operations
INTEL_GMA_SSC_ALTERNATE_REF	drivers/intel/gma	bool		Set when the SSC reference clock for LVDS runs at a different fre- quency than the general display reference clock. To be set by northbridge or mainboard Kconfig. For most platforms, there is no choice, i.e. for i945 and gm45 the SSC reference always differs from the display reference clock (i945: 66Mhz SSC vs. 48MHz DREF; gm45: 100MHz SSC vs. 96Mhz DREF), for Nehalem and newer, it's the same frequency for SSC/non-SSC (120MHz). The only, currently supported platform with a choice seems to be Pineview, where the alternative is 100MHz vs. the default 96MHz.
INTEL_GMA_SWSMISCI	drivers/intel/gma	bool		Select this option for Atom-based platforms which use the SWSMISCI register (0xe0) rather than the SWSCI register (0xe8).
GFX_GMA_ANALOG_I2C_PORT	drivers/intel/gma	string		Boards with a DVI-I connector share the I2C pins for both analog and digital displays. In that case, the EDID for a VGA display has to be read over the I2C interface of the coupled digital port.
DRIVERS_INTEL_MIPI_CAMERA	drivers/intel/mipi_camera	bool		MIPI CSI I2C camera SSDT generator. Generates SSDB and PWDB structures which are used by the Intel kernel drivers.
		(comment)		Intel FSP
HAVE_FSP_BIN	drivers/intel/fsp1_0	bool	Use Intel Firmware Support Package	Select this option to add an Intel FSP binary to the resulting coreboot image. Note: Without this binary, coreboot builds relying on the FSP will not boot
FSP_FILE	drivers/intel/fsp1_0	string	Intel FSP binary path and filename	The path and filename of the Intel FSP binary for this platform.
FSP_LOC	drivers/intel/fsp1_0	hex	Intel FSP Binary location in CBFS	The location in CBFS that the FSP is located. This must match the value that is set in the FSP binary. If the FSP needs to be moved, rebase the FSP with Intel's BCT (tool).
ENABLE_FSP_FAST_BOOT	drivers/intel/fsp1_0	bool	Enable Fast Boot	Enabling this feature will force the MRC data to be cached in NV storage to be used for speeding up boot time on future reboots and/or power cycles.
ENABLE_MRC_CACHE	drivers/intel/fsp1_0	bool		Enabling this feature will cause MRC data to be cached in NV storage. This can either be used for fast boot, or just because the FSP wants it to be saved.
MRC_CACHE_FMAP	drivers/intel/fsp1_0	bool	Use MRC Cache in FMAP	Use the region "RW_MRC_CACHE" in FMAP instead of "mrc.cache" in CBFS. You must define a region in your FMAP named "RW_MRC_CACHE".
MRC_CACHE_SIZE	drivers/intel/fsp1_0	hex	Fast Boot Data Cache Size	This is the amount of space in NV storage that is reserved for the fast boot data cache storage. WARNING: Because this area will be erased and re-written, the size should be a full sector of the flash ROM chip and nothing else should be included in CBFS in any sector that the fast boot cache data is in.
VIRTUAL_ROM_SIZE	drivers/intel/fsp1_0	hex	Virtual ROM Size	This is used to calculate the offset of the MRC data cache in NV Storage for fast boot. If in doubt, leave this set to the default which sets the virtual size equal to the ROM size. Example: Cougar Canyon 2 has two 8 MB SPI ROMs. When the SPI ROMs are loaded with a 4 MB coreboot image, the virtual ROM size is 8 MB. When the SPI ROMs are loaded with an 8 MB coreboot image, the virtual ROM size is 16 MB.
CACHE_ROM_SIZE_OVERRIDE	drivers/intel/fsp1_0	hex	Cache ROM Size	This is the size of the cachable area that is passed into the FSP in the early initialization. Typically this should be the size of the CBFS area, but the size must be a power of 2 whereas the CBFS size does not have this limitation.
USE_GENERIC_FSP_CAR_INC	drivers/intel/fsp1_0	bool		The chipset can select this to use a generic cache_as_ram.inc file that should be good for all FSP based platforms.
FSP_USES_UPD	drivers/intel/fsp1_0	bool		If this FSP uses UPD/VPD data regions, select this in the chipset Kconfig.
DRIVERS_INTEL_WIFI	drivers/intel/wifi	bool	Support Intel PCI-e WiFi adapters	When enabled, add identifiers in ACPI and SMBIOS tables to make OS drivers work with certain Intel PCI-e WiFi chipsets.
USE_SAR	drivers/intel/wifi	bool		Enable it when wifi driver uses SAR configuration feature. VPD entry "wifi_sar" is required to support it.
DSAR_SET_NUM	drivers/intel/wifi	hex	Number of SAR sets when D-SAR is enabled	There can be up to 3 optional SAR table sets.
PLATFORM_USES_FSP2_0	drivers/intel/fsp2_0	bool		Include FSP 2.0 wrappers and functionality
ADD_FSP_BINARIES	drivers/intel/fsp2_0	bool	Add Intel FSP 2.0 binaries to CBFS	Add the FSP-M and FSP-S binaries to CBFS. Currently coreboot does not use the FSP-T binary and it is not added.
DISPLAY_FSP_CALLS_AND_STATUS	drivers/intel/fsp2_0	bool	Display the FSP calls and status	Display the FSP call entry point and parameters prior to calling FSP and display the status upon return from FSP.
DISPLAY_FSP_HEADER	drivers/intel/fsp2_0	bool	Display the FSP header	Display the FSP header information when the FSP file is found.
DISPLAY_HOBS	drivers/intel/fsp2_0	bool	Display the hand-off-blocks	Display the FSP HOBs which are provided for coreboot.
DISPLAY_UPD_DATA	drivers/intel/fsp2_0	bool	Display UPD data	Display the user specified product data prior to memory initialization.
FSP_T_FILE	drivers/intel/fsp2_0	string	Intel FSP-T (temp ram init) binary path and filename	The path and filename of the Intel FSP-M binary for this platform.
FSP_M_FILE	drivers/intel/fsp2_0	string	Intel FSP-M (memory init) binary path and filename	The path and filename of the Intel FSP-M binary for this platform.
FSP_S_FILE	drivers/intel/fsp2_0	string	Intel FSP-S (silicon init) binary path and filename	The path and filename of the Intel FSP-S binary for this platform.
FSP_CAR	drivers/intel/fsp2_0	bool	Use FSP TempRamInit & TempRamExit APIs	Use FSP APIs to initialize & Tear Down the Cache-As-Ram
FSP_M_XIP	drivers/intel/fsp2_0	bool	Is FSP-M XIP	Select this value when FSP-M is execute-in-place.
VERIFY_HOBS	drivers/intel/fsp2_0	bool	Verify the FSP hand-off-blocks	Verify that the HOBs required by coreboot are returned by FSP and that the resource HOBs are in the correct order and position.
DISPLAY_FSP_VERSION_INFO	drivers/intel/fsp2_0	bool	Display Firmware Ingredient Version Information	Select this option to display Firmware version information.
FSP_PLATFORM_MEMORY_SETTINGS_VERSIONS	drivers/intel/fsp2_0	bool		This is selected by SoC or mainboard to supply their own concept of a version for the memory settings respectively. This allows deployed systems to bump their version number with the same FSP which will trigger a retrain of the memory.
DRIVERS_SIL_3114	drivers/sil/3114	bool	Silicon Image SIL3114	It sets PCI class to IDE compatible native mode, allowing SeaBIOS, FILO etc... to boot from it.
DRIVER_TI_TPS65090	drivers/ti/tps65090	bool		TI TPS65090
DRIVERS_EMULATION_QEMU_BOCHS	drivers/emulation/qemu	bool	bochs dispi interface vga driver	VGA driver for qemu emulated vga cards supporting the bochs dispi interface. This includes standard vga, vmware svga and qxl. The default vga (cirrus) is *not* supported, so you have to pick another one explicitly via 'qemu -vga $card'.
DRIVER_XPOWERS_AXP209	drivers/xpowers/axp209	bool		X-Powers AXP902 Power Management Unit
DRIVER_XPOWERS_AXP209_BOOTBLOCK	drivers/xpowers/axp209	bool		Make AXP209 functionality available in he bootblock.
DRIVER_PARADE_PS8640	drivers/parade/ps8640	bool		Parade PS8640 MIPI DSI to eDP Converter
DRIVER_PARADE_PS8625	drivers/parade/ps8625	bool		Parade ps8625 display port to lvds bridge
DRIVER_MAXIM_MAX77686	drivers/maxim/max77686	bool		Maxim MAX77686 power regulator
DRIVERS_I2C_PCA9538	drivers/i2c/pca9538	bool		Enable support for I2C I/O expander PCA9538.
DRIVERS_I2C_RX6110SA	drivers/i2c/rx6110sa	bool		Enable support for external RTC chip RX6110 SA.
DRIVERS_I2C_DESIGNWARE	drivers/i2c/designware	bool		Designware I2C support
DRIVERS_I2C_DESIGNWARE_CLOCK_MHZ	drivers/i2c/designware	int		The i2c ip block's clock.
DRIVERS_I2C_RTD2132	drivers/i2c/rtd2132	bool		Enable support for Realtek RTD2132 DisplayPort to LVDS bridge chip.
STORAGE_ERASE	commonlib/storage	bool	Support SD/MMC erase operations	Select to enable SD/MMC erase oprations
STORAGE_WRITE	commonlib/storage	bool	Support SD/MMC write operations	Select to enable SD/MMC write oprations
SD_MMC_DEBUG	commonlib/storage	bool	Debug SD/MMC card/devices operations	Display overview of SD/MMC card/device operations
SD_MMC_TRACE	commonlib/storage	bool	Trace SD/MMC card/device operations	Display details of SD/MMC card/device operations
SDHC_DEBUG	commonlib/storage	bool	Debug SD/MMC controller settings	Display clock speed and bus width settings
SDHC_TRACE	commonlib/storage	bool	Trace SD/MMC controller operations	Display the operations performed by the SD/MMC controller
SDHCI_ADMA_IN_BOOTBLOCK	commonlib/storage	bool		Determine if bootblock is able to use ADMA2 or ADMA64
SDHCI_ADMA_IN_ROMSTAGE	commonlib/storage	bool		Determine if romstage is able to use ADMA2 or ADMA64
SDHCI_ADMA_IN_VERSTAGE	commonlib/storage	bool		Determine if verstage is able to use ADMA2 or ADMA64
Menu: Security
Menu: Verified Boot (vboot)
VBOOT	security/vboot	bool	Verify firmware with vboot.	Enabling VBOOT will use vboot to verify the components of the firmware (stages, payload, etc).
VBOOT_VBNV_CMOS	security/vboot	bool		VBNV is stored in CMOS
VBOOT_VBNV_OFFSET	security/vboot	hex		CMOS offset for VbNv data. This value must match cmos.layout in the mainboard directory, minus 14 bytes for the RTC.
VBOOT_VBNV_CMOS_BACKUP_TO_FLASH	security/vboot	bool		Vboot non-volatile storage data will be backed up from CMOS to flash and restored from flash if the CMOS is invalid due to power loss.
VBOOT_VBNV_EC	security/vboot	bool		VBNV is stored in EC
VBOOT_VBNV_FLASH	security/vboot	bool		VBNV is stored in flash storage
VBOOT_STARTS_IN_BOOTBLOCK	security/vboot	bool		Firmware verification happens during the end of or right after the bootblock. This implies that a static VBOOT2_WORK() buffer must be allocated in memlayout.
VBOOT_STARTS_IN_ROMSTAGE	security/vboot	bool		Firmware verification happens during the end of romstage (after memory initialization). This implies that vboot working data is allocated in CBMEM.
VBOOT_MOCK_SECDATA	security/vboot	bool	Mock secdata for firmware verification	Enabling VBOOT_MOCK_SECDATA will mock secdata for the firmware verification to avoid access to a secdata storage (typically TPM). All operations for a secdata storage will be successful. This option can be used during development when a TPM is not present or broken. THIS SHOULD NOT BE LEFT ON FOR PRODUCTION DEVICES.
VBOOT_DISABLE_DEV_ON_RECOVERY	security/vboot	bool		When this option is enabled, the Chrome OS device leaves the developer mode as soon as recovery request is detected. This is handy on embedded devices with limited input capabilities.
VBOOT_SEPARATE_VERSTAGE	security/vboot	bool		If this option is set, vboot verification runs in a standalone stage that is loaded from the bootblock and exits into romstage. If it is not set, the verification code is linked directly into the bootblock or the romstage and runs as part of that stage (cf. related options VBOOT_STARTS_IN_BOOTBLOCK/_ROMSTAGE and VBOOT_RETURN_FROM_VERSTAGE).
VBOOT_RETURN_FROM_VERSTAGE	security/vboot	bool		If this is set, the verstage returns back to the calling stage instead of exiting to the succeeding stage so that the verstage space can be reused by the succeeding stage. This is useful if a RAM space is too small to fit both the verstage and the succeeding stage.
VBOOT_SAVE_RECOVERY_REASON_ON_REBOOT	security/vboot	bool		This option ensures that the recovery request is not lost because of reboots caused after vboot verification is run. e.g. reboots caused by FSP components on Intel platforms.
VBOOT_OPROM_MATTERS	security/vboot	bool		Set this option to indicate to vboot that this platform will skip its display initialization on a normal (non-recovery, non-developer) boot. Vboot calls this "oprom matters" because on x86 devices this traditionally meant that the video option ROM will not be loaded, but it works functionally the same for other platforms that can skip their native display initialization code instead.
VBOOT_HAS_REC_HASH_SPACE	security/vboot	bool		Set this option to indicate to vboot that recovery data hash space is present in TPM.
VBOOT_EC_SOFTWARE_SYNC	security/vboot	bool	Enable EC software sync	EC software sync is a mechanism where the AP helps the EC verify its firmware similar to how vboot verifies the main system firmware. This option selects whether vboot should support EC software sync.
VBOOT_EC_SLOW_UPDATE	security/vboot	bool		Whether the EC (or PD) is slow to update and needs to display a screen that informs the user the update is happening.
VBOOT_EC_EFS	security/vboot	bool		CrosEC can support EFS: Early Firmware Selection. If it's enabled, software sync need to also support it. This setting tells vboot to perform EFS software sync.
VBOOT_PHYSICAL_DEV_SWITCH	security/vboot	bool		Whether this platform has a physical developer switch. Note that this disables virtual dev switch functionality (through secdata). Operation where both a physical pin and the virtual switch get sampled is not supported by coreboot.
VBOOT_PHYSICAL_REC_SWITCH	security/vboot	bool		Whether this platform has a physical recovery switch.
VBOOT_LID_SWITCH	security/vboot	bool		Whether this platform has a lid switch. If it does, vboot will not decrement try counters for boot failures if the lid is closed.
VBOOT_WIPEOUT_SUPPORTED	security/vboot	bool		When this option is enabled, the firmware provides the ability to signal the application the need for factory reset (a.k.a. wipe out) of the device
VBOOT_FWID_MODEL	security/vboot	string	Firmware ID model	This is the first part of the FWID written to various regions of a vboot firmware image to identify its version.
VBOOT_FWID_VERSION	security/vboot	string	Firmware ID version	This is the second part of the FWID written to various regions of a vboot firmware image to identify its version.
VBOOT_NO_BOARD_SUPPORT	security/vboot	bool	Allow the use of vboot without board support	Enable weak functions for get_write_protect_state and get_recovery_mode_switch in order to proceed with refactoring of the vboot2 code base. Later on this code is removed and replaced by interfaces.
RO_REGION_ONLY	security/vboot	string	Additional files that should not be copied to RW	Add a space delimited list of filenames that should only be in the RO section.
Menu: GBB configuration
Menu: Vboot Keys
Menu: Trusted Platform Module
TPM	security/tpm	bool		Enable this option to enable TPM support in coreboot. If unsure, say N.
TPM2	security/tpm	bool		Enable this option to enable TPM2 support in coreboot. If unsure, say N.
DEBUG_TPM	security/tpm	bool	Output verbose TPM debug messages	This option enables additional TPM related debug messages.
POWER_OFF_ON_CR50_UPDATE	security/tpm	bool		Power off machine while waiting for CR50 update to take effect.
MAINBOARD_HAS_LPC_TPM	security/tpm	bool		Board has TPM support
MAINBOARD_HAS_TPM2	security/tpm	bool		There is a TPM device installed on the mainboard, and it is compliant with version 2 TCG TPM specification. Could be connected over LPC, SPI or I2C.
ACPI_SATA_GENERATOR	acpi	bool		Use ACPI SATA port generator.
ACPI_INTEL_HARDWARE_SLEEP_VALUES	acpi	bool		Provide common definitions for Intel hardware PM1_CNT register sleep values.
ACPI_AMD_HARDWARE_SLEEP_VALUES	acpi	bool		Provide common definitions for AMD hardware PM1_CNT register sleep values.
BOOT_DEVICE_MEMORY_MAPPED	toplevel	bool		Inform system if SPI is memory-mapped or not.
BOOT_DEVICE_SUPPORTS_WRITES	toplevel	bool		Indicate that the platform has writable boot device support.
Menu: Console
BOOTBLOCK_CONSOLE	console	bool	Enable early (bootblock) console output.	Use console during the bootblock if supported
POSTCAR_CONSOLE	console	bool	Enable console output during postcar.	Use console during the postcar if supported
SQUELCH_EARLY_SMP	console	bool	Squelch AP CPUs from early console.	When selected only the BSP CPU will output to early console. Console drivers have unpredictable behaviour if multiple threads attempt to share the same resources without a spinlock. If unsure, say Y.
CONSOLE_SERIAL	console	bool	Serial port console output	Send coreboot debug output to a serial port. The type of serial port driver selected based on your configuration is shown on the following menu line. Supporting multiple different types of UARTs in one build is not supported.
		(comment)		I/O mapped, 8250-compatible
		(comment)		memory mapped, 8250-compatible
		(comment)		device-specific UART
UART_FOR_CONSOLE	console	int	Index for UART port to use for console	Select an I/O port to use for serial console: 0 = 0x3f8, 1 = 0x2f8, 2 = 0x3e8, 3 = 0x2e8
TTYS0_BASE	console	hex		Map the COM port number to the respective I/O port.
		(comment)		Serial port base address = 0x3f8
		(comment)		Serial port base address = 0x2f8
		(comment)		Serial port base address = 0x3e8
		(comment)		Serial port base address = 0x2e8
UART_OVERRIDE_BAUDRATE	console	boolean		Set to "y" when the platform overrides the baudrate by providing a get_uart_baudrate routine.
CONSOLE_SERIAL_921600	console	bool	921600	Set serial port Baud rate to 921600.
CONSOLE_SERIAL_460800	console	bool	460800	Set serial port Baud rate to 460800.
CONSOLE_SERIAL_230400	console	bool	230400	Set serial port Baud rate to 230400.
CONSOLE_SERIAL_115200	console	bool	115200	Set serial port Baud rate to 115200.
CONSOLE_SERIAL_57600	console	bool	57600	Set serial port Baud rate to 57600.
CONSOLE_SERIAL_38400	console	bool	38400	Set serial port Baud rate to 38400.
CONSOLE_SERIAL_19200	console	bool	19200	Set serial port Baud rate to 19200.
CONSOLE_SERIAL_9600	console	bool	9600	Set serial port Baud rate to 9600.
TTYS0_BAUD	console	int		Map the Baud rates to an integer.
SPKMODEM	console	bool	spkmodem (console on speaker) console output	Send coreboot debug output through speaker
CONSOLE_USB	console	bool	USB dongle console output	Send coreboot debug output to USB. Configuration for USB hardware is under menu Generic Drivers.
ONBOARD_VGA_IS_PRIMARY	console	bool	Use onboard VGA as primary video device	If not selected, the last adapter found will be used.
CONSOLE_NE2K	console	bool	Network console over NE2000 compatible Ethernet adapter	Send coreboot debug output to a Ethernet console, it works same way as Linux netconsole, packets are received to UDP port 6666 on IP/MAC specified with options bellow. Use following netcat command: nc -u -l -p 6666
CONSOLE_NE2K_DST_MAC	console	string	Destination MAC address of remote system	Type in either MAC address of logging system or MAC address of the router.
CONSOLE_NE2K_DST_IP	console	string	Destination IP of logging system	This is IP address of the system running for example netcat command to dump the packets.
CONSOLE_NE2K_SRC_IP	console	string	IP address of coreboot system	This is the IP of the coreboot system
CONSOLE_NE2K_IO_PORT	console	hex	NE2000 adapter fixed IO port address	This is the IO port address for the IO port on the card, please select some non-conflicting region, 32 bytes of IO spaces will be used (and align on 32 bytes boundary, qemu needs broader align)
CONSOLE_CBMEM	console	bool	Send console output to a CBMEM buffer	Enable this to save the console output in a CBMEM buffer. This would allow to see coreboot console output from Linux space.
CONSOLE_CBMEM_BUFFER_SIZE	console	hex	Room allocated for console output in CBMEM	Space allocated for console output storage in CBMEM. The default value (128K or 0x20000 bytes) is large enough to accommodate even the BIOS_SPEW level.
CONSOLE_CBMEM_DUMP_TO_UART	console	bool	Dump CBMEM console on resets	Enable this to have CBMEM console buffer contents dumped on the serial output in case serial console is disabled and the device resets itself while trying to boot the payload.
CONSOLE_SPI_FLASH	console	bool	SPI Flash console output	Send coreboot debug output to the SPI Flash in the FMAP CONSOLE area This option can cause premature wear on the SPI flash and should not be used as a normal means of debugging. It is only to be enabled and used when porting a new motherboard which has no other console available (no UART, no POST, no cbmem access(non bootable)). Since a non bootable machine will require the use of an external SPI Flash programmer, the developer can grab the console log at the same time. The flash console will not be erased on reboot, so once it is full, the flashconsole driver will stop writing to it. This is to avoid wear on the flash, and to avoid erasing sectors (which may freeze the SPI controller on skylake). The 'CONSOLE' area can be extracted from the FMAP with : cbfstool rom.bin read -r CONSOLE -f console.log
CONSOLE_SPI_FLASH_BUFFER_SIZE	console	hex	Room allocated for console output in FMAP	Space allocated for console output storage in FMAP. The default value (128K or 0x20000 bytes) is large enough to accommodate even the BIOS_SPEW level.
CONSOLE_QEMU_DEBUGCON	console	bool	QEMU debug console output	Send coreboot debug output to QEMU's isa-debugcon device: qemu-system-x86_64 \ -chardev file,id=debugcon,path=/dir/file.log \ -device isa-debugcon,iobase=0x402,chardev=debugcon
SPI_CONSOLE	console	bool	SPI debug console output	Enable support for the debug console on the Dediprog EM100Pro. This is currently working only in ramstage due to how the spi drivers are written.
CONSOLE_OVERRIDE_LOGLEVEL	console	boolean		Set to "y" when the platform overrides the loglevel by providing a get_console_loglevel routine.
DEFAULT_CONSOLE_LOGLEVEL_8	console	bool	8: SPEW	Way too many details.
DEFAULT_CONSOLE_LOGLEVEL_7	console	bool	7: DEBUG	Debug-level messages.
DEFAULT_CONSOLE_LOGLEVEL_6	console	bool	6: INFO	Informational messages.
DEFAULT_CONSOLE_LOGLEVEL_5	console	bool	5: NOTICE	Normal but significant conditions.
DEFAULT_CONSOLE_LOGLEVEL_4	console	bool	4: WARNING	Warning conditions.
DEFAULT_CONSOLE_LOGLEVEL_3	console	bool	3: ERR	Error conditions.
DEFAULT_CONSOLE_LOGLEVEL_2	console	bool	2: CRIT	Critical conditions.
DEFAULT_CONSOLE_LOGLEVEL_1	console	bool	1: ALERT	Action must be taken immediately.
DEFAULT_CONSOLE_LOGLEVEL_0	console	bool	0: EMERG	System is unusable.
DEFAULT_CONSOLE_LOGLEVEL	console	int		Map the log level config names to an integer.
CMOS_POST	console	bool	Store post codes in CMOS for debugging	If enabled, coreboot will store post codes in CMOS and switch between two offsets on each boot so the last post code in the previous boot can be retrieved. This uses 3 bytes of CMOS.
CMOS_POST_OFFSET	console	hex	Offset into CMOS to store POST codes	If CMOS_POST is enabled then an offset into CMOS must be provided. If CONFIG_HAVE_OPTION_TABLE is enabled then it will use the value defined in the mainboard option table.
CMOS_POST_EXTRA	console	bool	Store extra logging info into CMOS	This will enable extra logging of work that happens between post codes into CMOS for debug. This uses an additional 8 bytes of CMOS.
CONSOLE_POST	console	bool	Show POST codes on the debug console	If enabled, coreboot will additionally print POST codes (which are usually displayed using a so-called "POST card" ISA/PCI/PCI-E device) on the debug console.
POST_IO	console	bool	Send POST codes to an IO port	If enabled, POST codes will be written to an IO port.
POST_IO_PORT	console	hex	IO port for POST codes	POST codes on x86 are typically written to the LPC bus on port 0x80. However, it may be desirable to change the port number depending on the presence of coprocessors/microcontrollers or if the platform does not support IO in the conventional x86 manner.
NO_EARLY_BOOTBLOCK_POSTCODES	console	hex		Some chipsets require that the routing for the port 80h POST code be configured before any POST codes are sent out. This can be done in the boot block, but there are a couple of POST codes that go out before the chipset's bootblock initialization can happen. This option suppresses those POST codes.
ACPI_HUGE_LOWMEM_BACKUP	toplevel	bool		On S3 resume path, backup low memory from RAMBASE..RAMTOP in CBMEM.
RESUME_PATH_SAME_AS_BOOT	toplevel	bool		This option indicates that when a system resumes it takes the same path as a regular boot. e.g. an x86 system runs from the reset vector at 0xfffffff0 on both resume and warm/cold boot.
HAVE_HARD_RESET	toplevel	bool		This variable specifies whether a given board has a hard_reset function, no matter if it's provided by board code or chipset code.
HAVE_ROMSTAGE_NVRAM_CBFS_SPINLOCK	toplevel	bool		This should be enabled on certain plaforms, such as the AMD SR565x, that cannot handle concurrent CBFS accesses from multiple APs during early startup.
HAVE_MONOTONIC_TIMER	toplevel	bool		The board/chipset provides a monotonic timer.
GENERIC_UDELAY	toplevel	bool		The board/chipset uses a generic udelay function utilizing the monotonic timer.
TIMER_QUEUE	toplevel	bool		Provide a timer queue for performing time-based callbacks.
COOP_MULTITASKING	toplevel	bool		Cooperative multitasking allows callbacks to be multiplexed on the main thread of ramstage. With this enabled it allows for multiple execution paths to take place when they have udelay() calls within their code.
NUM_THREADS	toplevel	int		How many execution threads to cooperatively multitask with.
HAVE_OPTION_TABLE	toplevel	bool		This variable specifies whether a given board has a cmos.layout file containing NVRAM/CMOS bit definitions. It defaults to 'n' but can be selected in mainboard/*/Kconfig.
GFXUMA	toplevel	bool		Enable Unified Memory Architecture for graphics.
HAVE_ACPI_TABLES	toplevel	bool		This variable specifies whether a given board has ACPI table support. It is usually set in mainboard/*/Kconfig.
HAVE_MP_TABLE	toplevel	bool		This variable specifies whether a given board has MP table support. It is usually set in mainboard/*/Kconfig. Whether or not the MP table is actually generated by coreboot is configurable by the user via GENERATE_MP_TABLE.
HAVE_PIRQ_TABLE	toplevel	bool		This variable specifies whether a given board has PIRQ table support. It is usually set in mainboard/*/Kconfig. Whether or not the PIRQ table is actually generated by coreboot is configurable by the user via GENERATE_PIRQ_TABLE.
MAX_PIRQ_LINKS	toplevel	int		This variable specifies the number of PIRQ interrupt links which are routable. On most chipsets, this is 4, INTA through INTD. Some chipsets offer more than four links, commonly up to INTH. They may also have a separate link for ATA or IOAPIC interrupts. When the PIRQ table specifies links greater than 4, pirq_route_irqs will not function properly, unless this variable is correctly set.
ACPI_NHLT	toplevel	bool		Build support for NHLT (non HD Audio) ACPI table generation.
Menu: System tables
GENERATE_MP_TABLE	toplevel	bool	Generate an MP table	Generate an MP table (conforming to the Intel MultiProcessor specification 1.4) for this board. If unsure, say Y.
GENERATE_PIRQ_TABLE	toplevel	bool	Generate a PIRQ table	Generate a PIRQ table for this board. If unsure, say Y.
GENERATE_SMBIOS_TABLES	toplevel	bool	Generate SMBIOS tables	Generate SMBIOS tables for this board. If unsure, say Y.
MAINBOARD_SERIAL_NUMBER	toplevel	string	SMBIOS Serial Number	The Serial Number to store in SMBIOS structures.
MAINBOARD_VERSION	toplevel	string	SMBIOS Version Number	The Version Number to store in SMBIOS structures.
MAINBOARD_SMBIOS_MANUFACTURER	toplevel	string	SMBIOS Manufacturer	Override the default Manufacturer stored in SMBIOS structures.
MAINBOARD_SMBIOS_PRODUCT_NAME	toplevel	string	SMBIOS Product name	Override the default Product name stored in SMBIOS structures.
SMBIOS_ENCLOSURE_TYPE	toplevel	hex		System Enclosure or Chassis Types as defined in SMBIOS specification. The default value is SMBIOS_ENCLOSURE_DESKTOP (0x03) or SMBIOS_ENCLOSURE_LAPTOP (0x09) if SYSTEM_TYPE_LAPTOP is set.
Menu: Payload
PAYLOAD_NONE	payloads	bool	None	Select this option if you want to create an "empty" coreboot ROM image for a certain mainboard, i.e. a coreboot ROM image which does not yet contain a payload. For such an image to be useful, you have to use 'cbfstool' to add a payload to the ROM image later.
PAYLOAD_ELF	payloads	bool	An ELF executable payload	Select this option if you have a payload image (an ELF file) which coreboot should run as soon as the basic hardware initialization is completed. You will be able to specify the location and file name of the payload image later.
PAYLOAD_BAYOU	payloads	bool	Bayou	Select this option if you want to set bayou as your primary payload.
PAYLOAD_UBOOT	payloads/external/U-Boot.name	bool	U-Boot (Experimental)	Select this option if you want to build a coreboot image with a U-Boot payload. See https://coreboot.org/Payloads and U-Boot's documentation at http://git.denx.de/?p=u-boot.git;a=blob;f=doc/README.x86 for more information.
PAYLOAD_SEABIOS	payloads/external/SeaBIOS.name	bool	SeaBIOS	Select this option if you want to build a coreboot image with a SeaBIOS payload. If you don't know what this is about, just leave it enabled. See https://coreboot.org/Payloads for more information.
PAYLOAD_FILO	payloads/external/FILO.name	bool	FILO	Select this option if you want to build a coreboot image with a FILO payload. If you don't know what this is about, just leave it enabled. See https://coreboot.org/Payloads for more information.
PAYLOAD_LINUX	payloads/external/linux.name	bool	A Linux payload	Select this option if you have a Linux bzImage which coreboot should run as soon as the basic hardware initialization is completed. You will be able to specify the location and file name of the payload image later.
PAYLOAD_TIANOCORE	payloads/external/tianocore.name	bool	Tianocore coreboot payload package	Select this option if you want to build a coreboot image with a Tianocore payload. If you don't know what this is about, just leave it enabled. See https://coreboot.org/Payloads for more information.
PAYLOAD_GRUB2	payloads/external/GRUB2.name	bool	GRUB2	Select this option if you want to build a coreboot image with a GRUB2 payload. If you don't know what this is about, just leave it enabled. See https://coreboot.org/Payloads for more information.
PAYLOAD_DEPTHCHARGE	payloads/external/depthcharge.name	bool	Depthcharge	Select this option if you want to build a coreboot image with a depthcharge payload. See https://coreboot.org/Payloads for more information.
UBOOT_STABLE	payloads/external/U-Boot	bool	v2016.1	Stable U-Boot version
UBOOT_MASTER	payloads/external/U-Boot	bool	master	Newest U-Boot version
PAYLOAD_CONFIGFILE	payloads/external/U-Boot	string	U-Boot config file	This option allows a platform to set Kconfig options for a basic U-Boot payload. In general, if the option is used, the default would be "$(top)/src/mainboard/$(MAINBOARDDIR)/config_uboot" for a config stored in the coreboot mainboard directory, or "$(project_dir)/configs/coreboot-x86_defconfig" to use a config from the U-Boot config directory
SEABIOS_STABLE	payloads/external/SeaBIOS	bool	1.11.1	Stable SeaBIOS version
SEABIOS_MASTER	payloads/external/SeaBIOS	bool	master	Newest SeaBIOS version
SEABIOS_REVISION	payloads/external/SeaBIOS	bool	git revision	Select this option if you have a specific commit or branch that you want to use as the revision from which to build SeaBIOS. You will be able to specify the name of a branch or a commit id later.
SEABIOS_REVISION_ID	payloads/external/SeaBIOS	string	Insert a commit's SHA-1 or a branch name	The commit's SHA-1 or branch name of the revision to use.
SEABIOS_PS2_TIMEOUT	payloads/external/SeaBIOS	int	PS/2 keyboard controller initialization timeout (milliseconds)	Some PS/2 keyboard controllers don't respond to commands immediately after powering on. This specifies how long SeaBIOS will wait for the keyboard controller to become ready before giving up.
SEABIOS_THREAD_OPTIONROMS	payloads/external/SeaBIOS	bool	Hardware init during option ROM execution	Allow hardware init to run in parallel with optionrom execution. This can reduce boot time, but can cause some timing variations during option ROM code execution. It is not known if all option ROMs will behave properly with this option.
SEABIOS_VGA_COREBOOT	payloads/external/SeaBIOS	bool	Include generated option rom that implements legacy VGA BIOS compatibility	coreboot can initialize the GPU of some mainboards. After initializing the GPU, the information about it can be passed to the payload. Provide an option rom that implements this legacy VGA BIOS compatibility requirement.
PAYLOAD_CONFIGFILE	payloads/external/SeaBIOS	string	SeaBIOS config file	This option allows a platform to set Kconfig options for a basic SeaBIOS payload. In general, if the option is used, the default would be "$(top)/src/mainboard/$(MAINBOARDDIR)/config_seabios"
SEABIOS_BOOTORDER_FILE	payloads/external/SeaBIOS	string	SeaBIOS bootorder file	Add a SeaBIOS bootorder file. From the wiki: "The bootorder file may be used to configure the boot up order. The file should be ASCII text and contain one line per boot method. The description of each boot method follows an Open Firmware device path format. SeaBIOS will attempt to boot from each item in the file - first line of the file first." See: https://www.coreboot.org/SeaBIOS#Configuring_boot_order If used, a typical value would be: $(top)/src/mainboard/$(MAINBOARDDIR)/bootorder
SEABIOS_DEBUG_LEVEL	payloads/external/SeaBIOS	int	SeaBIOS debug level (verbosity)	The higher the number, the more verbose SeaBIOS will be. See the table below for the current values corresponding to various items as of SeaBIOS version 1.10.1. Set this value to -1 to use SeaBIOS' default. Output at various SeaBIOS log levels: level 0 - Logging disabled level 1 - Basic output, interrupts 5, 18h, 19h, 40h, SMP, PNP, PMM level 2 - AHCI, Floppy, Basic ps2, interrupts 11h, 12h, 14h, 17h level 3 - bootsplash, initializations, SeaBIOS VGA BIOS interrupts level 4 - bios tables, more optionrom level 5 - Extra bootsplash, more XHCI level 6 - ATA commands, extra optionrom level 7 - extra ps2 commands, more OHCI & EHCI level 8 - extra malloc info, more AHCI level 9 - interrupts 15h, 16h, 1ah, APM, PCI, SMIs, PCIBIOS, USB-HID commands, SDcard commands, Floppy commands level 10 - interrupt 13h (Drives other than floppy) level 20 - interrupt 10h (Display)
		(comment)		Using default SeaBIOS log level
		(comment)		SeaBIOS logging disabled
Menu: PXE Options
PXE_ROM	payloads/external/iPXE	bool	Add an existing PXE ROM image	Select this option if you have a PXE ROM image that you would like to add to your ROM.
BUILD_IPXE	payloads/external/iPXE	bool	Build and add an iPXE ROM	Select this option to fetch and build a ROM from the iPXE project.
IPXE_STABLE	payloads/external/iPXE	bool	2017.3	iPXE uses a rolling release with no stable version, for reproducibility, use the last commit of a given month as the 'stable' version. This is iPXE from the end of March, 2017.
IPXE_MASTER	payloads/external/iPXE	bool	master	Newest iPXE version.
PXE_ROM_FILE	payloads/external/iPXE	string	PXE ROM filename	The path and filename of the file to use as PXE ROM.
PXE_ROM_ID	payloads/external/iPXE	string	network card PCI IDs	The comma-separated PCI vendor and device ID that would associate your PXE ROM to your network card. Example: 10ec,8168 In the above example 10ec is the PCI vendor ID (in hex, but without the "0x" prefix) and 8168 specifies the PCI device ID of the network card (also in hex, without "0x" prefix). Under GNU/Linux you can run `lspci -nn` to list the IDs of your PCI devices.
FILO_STABLE	payloads/external/FILO	bool	0.6.0	Stable FILO version
FILO_MASTER	payloads/external/FILO	bool	HEAD	Newest FILO version
PAYLOAD_FILE	payloads/external/linux	string	Linux path and filename	The path and filename of the bzImage kernel to use as payload.
LINUX_COMMAND_LINE	payloads/external/linux	string	Linux command line	A command line to add to the Linux kernel.
LINUX_INITRD	payloads/external/linux	string	Linux initrd	An initrd image to add to the Linux kernel.
PAYLOAD_FILE	payloads/external/tianocore	string	Tianocore binary	The result of a corebootPkg build
PAYLOAD_FILE	payloads/external/tianocore	string	Tianocore version	Select which version of Tianocore to build (default is to build stable) stable: a version of Tianocore that builds without any errors master: most recent version from upstream Tianocore repository revision: use specific commit or branch to build Tianocore (specified by user)
TIANOCORE_STABLE	payloads/external/tianocore	bool	stable	Select this option to build the stable tianocore version i.e. a version of Tianocore that builds without any errors
TIANOCORE_MASTER	payloads/external/tianocore	bool	master	Select this option to build the master tianocore version i.e. most recent version from upstream Tianocore repository
TIANOCORE_REVISION	payloads/external/tianocore	bool	git revision	Select this option if you have a specific commit or branch that you want to use as the revision from which to build Tianocore. You will be able to specify the name of a branch or a commit id later.
TIANOCORE_REVISION_ID	payloads/external/tianocore	string	Insert a commit's SHA-1 or a branch name	The commit's SHA-1 or branch name of the revision to use.
TIANOCORE_REVISION_ID	payloads/external/tianocore	string	Target architecture	The Tianocore coreboot Payload Package binary can be built for either only IA32 or both X64 and IA32 architectures. Select which architecture(s) to build for; default is to build for both X64 and IA32.
TIANOCORE_TARGET_IA32	payloads/external/tianocore	bool	IA32	By selecting this option, the target architecture will be built for only IA32.
TIANOCORE_TARGET_X64	payloads/external/tianocore	bool	X64	By selecting this option, the target architecture will be built for X64 and IA32.
TIANOCORE_TARGET_X64	payloads/external/tianocore	bool	Tianocore build	Select whether to generate a debug or release build for Tianocore; default is to generate a release build.
TIANOCORE_DEBUG	payloads/external/tianocore	bool	Generate Tianocore debug build	Generate a debug build.
TIANOCORE_RELEASE	payloads/external/tianocore	bool	Generate Tianocore release build	Generate a release build.
GRUB2_STABLE	payloads/external/GRUB2	bool	2.02	Stable GRUB2 version
GRUB2_MASTER	payloads/external/GRUB2	bool	HEAD	Newest GRUB2 version
GRUB2_REVISION	payloads/external/GRUB2	bool	git revision	Select this option if you have a specific commit or branch that you want to use as the revision from which to build GRUB2. You will be able to specify the name of a branch or a commit id later.
GRUB2_REVISION_ID	payloads/external/GRUB2	string	Insert a commit's SHA-1 or a branch name	The commit's SHA-1 or branch name of the revision to use.
GRUB2_EXTRA_MODULES	payloads/external/GRUB2	string	Extra modules to include in GRUB image	Space-separated list of additional modules to include. Few common ones: bsd for *BSD png/jpg for PNG/JPG images gfxmenu for graphical menus (you'll need a theme as well) gfxterm_background for setting background
GRUB2_INCLUDE_RUNTIME_CONFIG_FILE	payloads/external/GRUB2	bool	Include GRUB2 runtime config file into ROM image	The GRUB2 payload reads its runtime configuration file from etc/grub.cfg stored in the CBFS on the flash ROM chip. Without that, it’ll just drop into a rescue shell. This configuration may need to be coreboot specific. Select this option, if you want to include the GRUB2 runtime configuration file into CBFS as `etc/grub.cfg` automatically. You will be able to specify the path of the configuration file later. Without this option you would need to add this file manually with build/cbfstool build/coreboot.rom add -f grub.cfg -n etc/grub.cfg -t raw
GRUB2_RUNTIME_CONFIG_FILE	payloads/external/GRUB2	string	Path of grub.cfg	The path of the GRUB2 runtime configuration file to be added to CBFS.
DEPTHCHARGE_STABLE	payloads/external/depthcharge	bool	stable	Latest stable version.
DEPTHCHARGE_MASTER	payloads/external/depthcharge	bool	master	Newest Depthcharge version.
DEPTHCHARGE_REVISION	payloads/external/depthcharge	bool	git revision	Select this option if you have a specific commit or branch that you want to use as the revision from which to build Depthcharge. You will be able to specify the name of a branch or a commit SHA later.
DEPTHCHARGE_REVISION_ID	payloads/external/depthcharge	string	Insert a commit's SHA-1 or a branch name	The commit's SHA-1 or branch name of the revision to use.
LP_DEFCONFIG_OVERRIDE	payloads/external/depthcharge	bool	Use default libpayload config	The Depthcharge makefile looks for a file config.<boardname> in the libpayload/configs directory. Say Y here to use the file defconfig instead. This is can be a convenience for development purposes, or if the defaults in defconfig are sufficient for your system.
PAYLOAD_FILE	payloads	string	Payload path and filename	The path and filename of the ELF executable file to use as payload.
PAYLOAD_FILE	payloads	string	Payload compression algorithm	Choose the compression algorithm for the chosen payloads. You can choose between LZMA and LZ4.
COMPRESSED_PAYLOAD_LZMA	payloads	bool	Use LZMA compression for payloads	In order to reduce the size payloads take up in the ROM chip coreboot can compress them using the LZMA algorithm.
COMPRESSED_PAYLOAD_LZ4	payloads	bool	Use LZ4 compression for payloads	In order to reduce the size payloads take up in the ROM chip coreboot can compress them using the LZ4 algorithm.
PAYLOAD_OPTIONS	payloads	string		Additional cbfstool options for the payload
PAYLOAD_IS_FLAT_BINARY	payloads	string		Add the payload to cbfs as a flat binary type instead of as an elf payload
COMPRESS_SECONDARY_PAYLOAD	payloads	bool	Use LZMA compression for secondary payloads	In order to reduce the size secondary payloads take up in the ROM chip they can be compressed using the LZMA algorithm.
Menu: Secondary Payloads
COREINFO_SECONDARY_PAYLOAD	payloads	bool	Load coreinfo as a secondary payload	coreinfo can be loaded as a secondary payload under SeaBIOS, GRUB, or any other payload that can load additional payloads.
MEMTEST_SECONDARY_PAYLOAD	payloads	bool	Load Memtest86+ as a secondary payload	Memtest86+ can be loaded as a secondary payload under SeaBIOS, GRUB, or any other payload that can load additional payloads.
MEMTEST_STABLE	payloads	bool	Stable	Stable Memtest86+ version. For reproducible builds, this option must be selected.
MEMTEST_MASTER	payloads	bool	Master	Newest Memtest86+ version. This option will fetch the newest version of the Memtest86+ code, updating as new changes are committed. This makes the build non-reproducible, as it can fetch different code each time.
NVRAMCUI_SECONDARY_PAYLOAD	payloads	bool	Load nvramcui as a secondary payload	nvramcui can be loaded as a secondary payload under SeaBIOS, GRUB, or any other payload that can load additional payloads.
TINT_SECONDARY_PAYLOAD	payloads	bool	Load tint as a secondary payload	tint can be loaded as a secondary payload under SeaBIOS, GRUB, or any other payload that can load additional payloads.
Menu: Debugging
GDB_STUB	toplevel	bool	GDB debugging support	If enabled, you will be able to set breakpoints for gdb debugging. See src/arch/x86/lib/c_start.S for details.
GDB_WAIT	toplevel	bool	Wait for a GDB connection in the ramstage	If enabled, coreboot will wait for a GDB connection in the ramstage.
FATAL_ASSERTS	toplevel	bool	Halt when hitting a BUG() or assertion error	If enabled, coreboot will call hlt() on a BUG() or failed ASSERT().
DEBUG_CBFS	toplevel	bool	Output verbose CBFS debug messages	This option enables additional CBFS related debug messages.
DEBUG_RAM_SETUP	toplevel	bool	Output verbose RAM init debug messages	This option enables additional RAM init related debug messages. It is recommended to enable this when debugging issues on your board which might be RAM init related. Note: This option will increase the size of the coreboot image. If unsure, say N.
DEBUG_CAR	toplevel	bool	Output verbose Cache-as-RAM debug messages	This option enables additional CAR related debug messages.
DEBUG_PIRQ	toplevel	bool	Check PIRQ table consistency	If unsure, say N.
DEBUG_SMBUS	toplevel	bool	Output verbose SMBus debug messages	This option enables additional SMBus (and SPD) debug messages. Note: This option will increase the size of the coreboot image. If unsure, say N.
DEBUG_SMI	toplevel	bool	Output verbose SMI debug messages	This option enables additional SMI related debug messages. Note: This option will increase the size of the coreboot image. If unsure, say N.
DEBUG_SMM_RELOCATION	toplevel	bool	Debug SMM relocation code	This option enables additional SMM handler relocation related debug messages. Note: This option will increase the size of the coreboot image. If unsure, say N.
DEBUG_MALLOC	toplevel	bool	Output verbose malloc debug messages	This option enables additional malloc related debug messages. Note: This option will increase the size of the coreboot image. If unsure, say N.
DEBUG_ACPI	toplevel	bool	Output verbose ACPI debug messages	This option enables additional ACPI related debug messages. Note: This option will slightly increase the size of the coreboot image. If unsure, say N.
REALMODE_DEBUG	toplevel	bool	Enable debug messages for option ROM execution	This option enables additional x86emu related debug messages. Note: This option will increase the time to emulate a ROM. If unsure, say N.
X86EMU_DEBUG	toplevel	bool	Output verbose x86emu debug messages	This option enables additional x86emu related debug messages. Note: This option will increase the size of the coreboot image. If unsure, say N.
X86EMU_DEBUG_JMP	toplevel	bool	Trace JMP/RETF	Print information about JMP and RETF opcodes from x86emu. Note: This option will increase the size of the coreboot image. If unsure, say N.
X86EMU_DEBUG_TRACE	toplevel	bool	Trace all opcodes	Print _all_ opcodes that are executed by x86emu. WARNING: This will produce a LOT of output and take a long time. Note: This option will increase the size of the coreboot image. If unsure, say N.
X86EMU_DEBUG_PNP	toplevel	bool	Log Plug&Play accesses	Print Plug And Play accesses made by option ROMs. Note: This option will increase the size of the coreboot image. If unsure, say N.
X86EMU_DEBUG_DISK	toplevel	bool	Log Disk I/O	Print Disk I/O related messages. Note: This option will increase the size of the coreboot image. If unsure, say N.
X86EMU_DEBUG_PMM	toplevel	bool	Log PMM	Print messages related to POST Memory Manager (PMM). Note: This option will increase the size of the coreboot image. If unsure, say N.
X86EMU_DEBUG_VBE	toplevel	bool	Debug VESA BIOS Extensions	Print messages related to VESA BIOS Extension (VBE) functions. Note: This option will increase the size of the coreboot image. If unsure, say N.
X86EMU_DEBUG_INT10	toplevel	bool	Redirect INT10 output to console	Let INT10 (i.e. character output) calls print messages to debug output. Note: This option will increase the size of the coreboot image. If unsure, say N.
X86EMU_DEBUG_INTERRUPTS	toplevel	bool	Log intXX calls	Print messages related to interrupt handling. Note: This option will increase the size of the coreboot image. If unsure, say N.
X86EMU_DEBUG_CHECK_VMEM_ACCESS	toplevel	bool	Log special memory accesses	Print messages related to accesses to certain areas of the virtual memory (e.g. BDA (BIOS Data Area) or interrupt vectors) Note: This option will increase the size of the coreboot image. If unsure, say N.
X86EMU_DEBUG_MEM	toplevel	bool	Log all memory accesses	Print memory accesses made by option ROM. Note: This also includes accesses to fetch instructions. Note: This option will increase the size of the coreboot image. If unsure, say N.
X86EMU_DEBUG_IO	toplevel	bool	Log IO accesses	Print I/O accesses made by option ROM. Note: This option will increase the size of the coreboot image. If unsure, say N.
X86EMU_DEBUG_TIMINGS	toplevel	bool	Output timing information	Print timing information needed by i915tool. If unsure, say N.
DEBUG_SPI_FLASH	toplevel	bool	Output verbose SPI flash debug messages	This option enables additional SPI flash related debug messages.
DEBUG_USBDEBUG	toplevel	bool	Output verbose USB 2.0 EHCI debug dongle messages	This option enables additional USB 2.0 debug dongle related messages. Select this to debug the connection of usbdebug dongle. Note that you need some other working console to receive the messages.
DEBUG_INTEL_ME	toplevel	bool	Verbose logging for Intel Management Engine	Enable verbose logging for Intel Management Engine driver that is present on Intel 6-series chipsets.
TRACE	toplevel	bool	Trace function calls	If enabled, every function will print information to console once the function is entered. The syntax is ~0xaaaabbbb(0xccccdddd) the 0xaaaabbbb is the actual function and 0xccccdddd is EIP of calling function. Please note some printk related functions are omitted from trace to have good looking console dumps.
DEBUG_COVERAGE	toplevel	bool	Debug code coverage	If enabled, the code coverage hooks in coreboot will output some information about the coverage data that is dumped.
DEBUG_BOOT_STATE	toplevel	bool	Debug boot state machine	Control debugging of the boot state machine. When selected displays the state boundaries in ramstage.
DEBUG_ADA_CODE	toplevel	bool	Compile debug code in Ada sources	Add the compiler switch `-gnata` to compile code guarded by `pragma Debug`.
NO_EDID_FILL_FB	lib	bool		Don't include default fill_lb_framebuffer() implementation. Select this if your drivers uses MAINBOARD_DO_NATIVE_VGA_INIT but provides its own fill_lb_framebuffer() implementation.
RAMSTAGE_ADA	lib	bool		Selected by features that use Ada code in ramstage.
RAMSTAGE_LIBHWBASE	lib	bool		Selected by features that require `libhwbase` in ramstage.
FLATTENED_DEVICE_TREE	lib	bool		Selected by features that require to parse and manipulate a flattened devicetree in ramstage.
POWER_BUTTON_DEFAULT_ENABLE	toplevel	bool		Select when the board has a power button which can optionally be disabled by the user.
POWER_BUTTON_DEFAULT_DISABLE	toplevel	bool		Select when the board has a power button which can optionally be enabled by the user, e.g. when the board ships with a jumper over the power switch contacts.
POWER_BUTTON_FORCE_ENABLE	toplevel	bool		Select when the board requires that the power button is always enabled.
POWER_BUTTON_FORCE_DISABLE	toplevel	bool		Select when the board requires that the power button is always disabled, e.g. when it has been hardwired to ground.
POWER_BUTTON_IS_OPTIONAL	toplevel	bool		Internal option that controls ENABLE_POWER_BUTTON visibility.
REG_SCRIPT	toplevel	bool		Internal option that controls whether we compile in register scripts.
MAX_REBOOT_CNT	toplevel	int		Internal option that sets the maximum number of bootblock executions allowed with the normal image enabled before assuming the normal image is defective and switching to the fallback image.
CREATE_BOARD_CHECKLIST	toplevel	bool		When selected, creates a webpage showing the implementation status for the board. Routines highlighted in green are complete, yellow are optional and red are required and must be implemented. A table is produced for each stage of the boot process except the bootblock. The red items may be used as an implementation checklist for the board.
MAKE_CHECKLIST_PUBLIC	toplevel	bool		When selected, build/$(CONFIG_MAINBOARD_PART_NUMBER)_checklist.html is copied into the Documentation/$(CONFIG_MAINBOARD_VENDOR)/Board directory.
CHECKLIST_DATA_FILE_LOCATION	toplevel	string		Location of the <stage>_complete.dat and <stage>_optional.dat files that are consumed during checklist processing. <stage>_complete.dat contains the symbols that are expected to be in the resulting image. <stage>_optional.dat is a subset of <stage>_complete.dat and contains a list of weak symbols which the resulting image may consume. Other symbols contained only in <stage>_complete.dat will be flagged as required and not implemented if a weak implementation is found in the resulting image.
NO_XIP_EARLY_STAGES	toplevel	bool		Identify if early stages are eXecute-In-Place(XIP).
EARLY_CBMEM_LIST	toplevel	bool		Enable display of CBMEM during romstage and postcar.
RELOCATABLE_MODULES	toplevel	bool		If RELOCATABLE_MODULES is selected then support is enabled for building relocatable modules in the RAM stage. Those modules can be loaded anywhere and all the relocations are handled automatically.
NO_STAGE_CACHE	toplevel	bool		Do not save any component in stage cache for resume path. On resume, all components would be read back from CBFS again.
GENERIC_GPIO_LIB	toplevel	bool		If enabled, compile the generic GPIO library. A "generic" GPIO implies configurability usually found on SoCs, particularly the ability to control internal pull resistors.
GENERIC_SPD_BIN	toplevel	bool		If enabled, add support for adding spd.hex files in cbfs as spd.bin and locating it runtime to load SPD. Additionally provide provision to fetch SPD over SMBus.
DIMM_MAX	toplevel	int		Total number of memory DIMM slots available on motherboard. It is multiplication of number of channel to number of DIMMs per channel
DIMM_SPD_SIZE	toplevel	int		Total SPD size that will be used for DIMM. Ex: DDR3 256, DDR4 512.