The wiki is being retired!

Documentation is now handled by the same processes we use for code: Add something to the Documentation/ directory in the coreboot repo, and it will be rendered to https://doc.coreboot.org/. Contributions welcome!

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

Last update: 4.3-1004-gc1ae7e9

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.
COMMON_CBFS_SPI_WRAPPER	toplevel	bool		Use common wrapper to interface CBFS to SPI bootrom.
MULTIPLE_CBFS_INSTANCES	toplevel	bool	Multiple CBFS instances in the bootrom	Account for the firmware image containing more than one CBFS instance. Locations of instances are known at build time and are communicated between coreboot stages to make sure the next stage is loaded from the appropriate instance.
MULTIPLE_CBFS_INSTANCES	toplevel	bool	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.
SCONFIG_GENPARSER	toplevel	bool	Generate SCONFIG parser using flex and bison	Enable this option if you are working on the sconfig device tree parser and made changes to sconfig.l or sconfig.y. 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.
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
NO_XIP_EARLY_STAGES	toplevel	bool		Identify if --xip parameter needs to be passed into cbfstool for early stages.
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.
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.
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.
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	Cache the relocated ramstage outside of cbmem.	The relocated ramstage is saved in an area specified by the by the board and/or chipset.
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.
FLASHMAP_OFFSET	toplevel	hex	Flash Map Offset	Offset of flash map in firmware image
SKIP_MAX_REBOOT_CNT_CLEAR	toplevel	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.
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'
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.
BOARD_ID_AUTO	toplevel	bool		Mainboards that can read a board ID from the hardware straps (ie. GPIO) select this configuration option.
BOARD_ID_MANUAL	toplevel	bool		If you want to maintain a board ID, but the hardware does not have straps to automatically determine the ID, you can say Y here and add a file named 'board_id' to CBFS. If you don't know what this is about, say N.
BOARD_ID_STRING	toplevel	string	Board ID	This string is placed in the 'board_id' CBFS file for indicating board type.
RAM_CODE_SUPPORT	toplevel	bool		If enabled, coreboot discovers RAM configuration (value obtained by reading board straps) and stores it in coreboot table.
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.
ACPI_SATA_GENERATOR	acpi	bool		Use acpi sata port generator.
Menu: Mainboard
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.
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.
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
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).
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_MEDIA_SPI_BUS	mainboard/google/nyan_blaze	int	SPI bus with boot media ROM	Which SPI bus the boot media is connected to.
BOOT_MEDIA_SPI_CHIP_SELECT	mainboard/google/nyan_blaze	int	Chip select for SPI boot media	Which chip select to use for boot media.
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
MAINBOARD_PART_NUMBER	mainboard/google/rush_ryu	string	BCT boot media	Which boot media to configure the BCT for.
RUSH_RYU_BCT_CFG_SPI	mainboard/google/rush_ryu	bool	SPI	Configure the BCT for booting from SPI.
RUSH_RYU_BCT_CFG_EMMC	mainboard/google/rush_ryu	bool	eMMC	Configure the BCT for booting from eMMC.
BOOT_MEDIA_SPI_BUS	mainboard/google/rush_ryu	int	SPI bus with boot media ROM	Which SPI bus the boot media is connected to.
BOOT_MEDIA_SPI_CHIP_SELECT	mainboard/google/rush_ryu	int	Chip select for SPI boot media	Which chip select to use for boot media.
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_MEDIA_SPI_BUS	mainboard/google/smaug	int	SPI bus with boot media ROM	Which SPI bus the boot media is connected to.
BOOT_MEDIA_SPI_CHIP_SELECT	mainboard/google/smaug	int	Chip select for SPI boot media	Which chip select to use for boot media.
DRAM_SIZE_MB	mainboard/google/rush	int	BCT boot media	Which boot media to configure the BCT for.
RUSH_BCT_CFG_SPI	mainboard/google/rush	bool	SPI	Configure the BCT for booting from SPI.
RUSH_BCT_CFG_EMMC	mainboard/google/rush	bool	eMMC	Configure the BCT for booting from eMMC.
BOOT_MEDIA_SPI_BUS	mainboard/google/rush	int	SPI bus with boot media ROM	Which SPI bus the boot media is connected to.
BOOT_MEDIA_SPI_CHIP_SELECT	mainboard/google/rush	int	Chip select for SPI boot media	Which chip select to use for boot media.
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_MEDIA_SPI_BUS	mainboard/google/nyan_big	int	SPI bus with boot media ROM	Which SPI bus the boot media is connected to.
BOOT_MEDIA_SPI_CHIP_SELECT	mainboard/google/nyan_big	int	Chip select for SPI boot media	Which chip select to use for boot media.
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_MEDIA_SPI_BUS	mainboard/google/foster	int	SPI bus with boot media ROM	Which SPI bus the boot media is connected to.
BOOT_MEDIA_SPI_CHIP_SELECT	mainboard/google/foster	int	Chip select for SPI boot media	Which chip select to use for boot media.
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_MEDIA_SPI_BUS	mainboard/google/nyan	int	SPI bus with boot media ROM	Which SPI bus the boot media is connected to.
BOOT_MEDIA_SPI_CHIP_SELECT	mainboard/google/nyan	int	Chip select for SPI boot media	Which chip select to use for boot media.
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_ASUS_F2A85_M_LE_DDR3_VOLT_135	mainboard/asus/f2a85-m_le	bool	1.35V	Set DRR3 memory voltage to 1.35V
BOARD_ASUS_F2A85_M_LE_DDR3_VOLT_150	mainboard/asus/f2a85-m_le	bool	1.50V	Set DRR3 memory voltage to 1.50V
BOARD_ASUS_F2A85_M_LE_DDR3_VOLT_165	mainboard/asus/f2a85-m_le	bool	1.65V	Set DRR3 memory voltage to 1.65V
DRIVERS_PS2_KEYBOARD	mainboard/purism/librem13	None		Default PS/2 Keyboard to enabled on this board.
DRIVERS_UART_8250IO	mainboard/purism/librem13	None		This platform does not have any way to get standard serial output so disable it by default.
NO_POST	mainboard/purism/librem13	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.
Menu: On-Chip Device Power Down Control
Menu: Watchdog Timer setting
Menu: IDE controller setting
IDE_STANDARD_COMPATIBLE	mainboard/dmp/vortex86ex	bool	Standard IDE Compatible	Built-in IDE controller PCI vendor/device ID is 17F3:1012, which is not recognized by some OSes. This option can change IDE controller PCI vendor/device ID to other value for software compatibility.
IDE_COMPATIBLE_SELECTION	mainboard/dmp/vortex86ex	hex	IDE Compatible Selection	IDE controller PCI vendor/device ID value setting. Higher 16-bit is vendor ID, lower 16-bit is device ID.
Menu: GPIO setting
Menu: UART setting
Menu: LPT setting
		(comment)		see under vendor LiPPERT
BOARD_ROMSIZE_KB_16384	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_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.
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.
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
MAINBOARD_DO_DSI_INIT	soc/nvidia/tegra132	bool	Use dsi graphics interface	Initialize dsi display
MAINBOARD_DO_SOR_INIT	soc/nvidia/tegra132	bool	Use dp graphics interface	Initialize dp display
MTS_DIRECTORY	soc/nvidia/tegra132	string	Directory where MTS microcode files are located	Path to directory where MTS microcode files are located.
TRUSTZONE_CARVEOUT_SIZE_MB	soc/nvidia/tegra132	hex	Size of Trust Zone region	Size of Trust Zone area in MiB to reserve in memory map.
BOOTROM_SDRAM_INIT	soc/nvidia/tegra132	bool	SoC BootROM does SDRAM init with full BCT	Use during Ryu LPDDR3 bringup
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_BAYTRAIL_GFX_INIT	soc/intel/fsp_baytrail	bool		Enabling this option will activate graphics init code. With this init, the graphic power gate registers will be initialized before VBIOS is executed.
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_BRASWELL	soc/intel/braswell	bool		Braswell M/D part support.
DCACHE_RAM_SIZE	soc/intel/braswell	hex	Temporary RAM Size	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_ROMSTAGE_STACK_SIZE	soc/intel/braswell	hex		The amount of anticipated stack usage from the data cache during pre-ram rom stage execution.
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_APOLLOLAKE	soc/intel/apollolake	bool		Intel Apollolake 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.
DCACHE_RAM_SIZE	soc/intel/apollolake	hex	Length in bytes of cache-as-RAM	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
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.
DCACHE_RAM_ROMSTAGE_STACK_SIZE	soc/intel/baytrail	hex		The amount of anticipated stack usage from the data cache during pre-RAM ROM stage execution.
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_QUARK	soc/intel/quark	bool		Intel Quark support
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	HSUART1 Base Address	Memory mapped MMIO of HSUART1.
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.
ENABLE_DEBUG_LED_FINDFSP	soc/intel/quark	bool	SD LED indicates fsp.bin file was found	Indicate that fsp.bin was found.
ENABLE_DEBUG_LED_TEMPRAMINIT	soc/intel/quark	bool	SD LED indicates TempRamInit was successful	Indicate that TempRamInit was successful.
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_IMAGE_ID_STRING	soc/intel/quark	string	8 byte platform string identifying the FSP platform	8 ASCII character byte signature string that will help match the FSP binary to a supported hardware configuration.
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_FSP_PDAT_FILE	soc/intel/quark	bool	Should the PDAT binary be added to the flash image?	The PDAT file is required for the FSP 1.1 binary
FSP_PDAT_FILE	soc/intel/quark	string		The path and filename of the Intel Galileo platform-data-patch (PDAT) binary. This binary file is generated by the platform-data-patch.py script released with the Quark BSP and contains the Ethernet address.
FSP_PDAT_LOC	soc/intel/quark	hex		The location in CBFS that the PDAT is located. It must match the PCD PcdPlatformDataBaseAddress of Quark SoC FSP.
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.
SOC_INTEL_COMMON	soc/intel/common	bool		common code for Intel SOCs
SOC_SETS_MTRRS	soc/intel/common	bool		The SoC needs uses different access methods for reading and writing the MTRRs. Use SoC specific routines to handle the MTRR access.
MMA	soc/intel/common	bool	enable MMA (Memory Margin Analysis) support	Set this option to y to enable MMA (Memory Margin Analysis) support
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.
DRIVERS_UART_8250IO	soc/intel/fsp_broadwell_de	bool	Serial port on SuperIO (Broadwell-DE's UART ports unselected)	Select to choose SuperIO's serial port for console output. CANNOT select if intend to use SoC integrated serial ports.
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.
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.
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.
DCACHE_RAM_ROMSTAGE_STACK_SIZE	soc/intel/broadwell	hex		The amount of anticipated stack usage from the data cache during pre-ram rom stage execution.
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_SKYLAKE	soc/intel/skylake	bool		Intel Skylake support
DCACHE_RAM_SIZE	soc/intel/skylake	hex	Length in bytes of cache-as-RAM	The size of the cache-as-ram region required during bootblock and/or romstage.
EXCLUDE_NATIVE_SD_INTERFACE	soc/intel/skylake	bool		If you set this option to n, will not use native SD controller.
MONOTONIC_TIMER_MSR	soc/intel/skylake	hex		Provide a monotonic timer using the 24MHz MSR counter.
PRE_GRAPHICS_DELAY	soc/intel/skylake	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.
SERIRQ_CONTINUOUS_MODE	soc/intel/skylake	bool		If you set this option to y, the serial IRQ machine will be operated in continuous mode.
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_SSM4567	soc/intel/skylake	bool		Include DSP firmware settings for ssm4567 smart amplifier.
SKIP_FSP_CAR	soc/intel/skylake	bool	Skip cache as RAM setup in FSP	Skip Cache as RAM setup in FSP.
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 message	This option enables additional DRAM related debug messages.
DEBUG_I2C	soc/mediatek/mt8173	bool	Output verbose I2C related debug message	This option enables I2C related debug message.
DEBUG_PMIC	soc/mediatek/mt8173	bool	Output verbose PMIC related debug message	This option enables PMIC related debug message.
DEBUG_PMIC_WRAP	soc/mediatek/mt8173	bool	Output verbose PMIC WRAP related debug message	This option enables PMIC WRAP related debug message.
BOOTBLOCK_CPU_INIT	soc/marvell/armada38x	string		CPU/SoC-specific bootblock code. This is useful if the bootblock must load microcode or copy data from ROM before searching for the 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.
		(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
GEODE_VSA_FILE	cpu/amd/geode_gx2	bool	Add a VSA image	Select this option if you have an AMD Geode GX2 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_gx2	string	AMD Geode GX2 VSA path and filename	The path and filename of the file to use as VSA.
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.
REDIRECT_IDS_HDT_CONSOLE_TO_SERIAL	cpu/amd/agesa/family10	bool	Redirect AGESA IDS_HDT_CONSOLE to serial console	This Option allows you to redirect the AMD AGESA IDS_HDT_CONSOLE debug information to the serial console. Warning: Only enable this option when debuging or tracing AMD AGESA code.
CPU_AMD_SOCKET_G34	cpu/amd/agesa/family15	bool		AMD G34 Socket
CPU_AMD_SOCKET_C32	cpu/amd/agesa/family15	bool		AMD C32 Socket
CPU_AMD_SOCKET_AM3R2	cpu/amd/agesa/family15	bool		AMD AM3r2 Socket
REDIRECT_IDS_HDT_CONSOLE_TO_SERIAL	cpu/amd/agesa/family15	bool	Redirect AGESA IDS_HDT_CONSOLE to serial console	This Option allows you to redirect the AMD AGESA IDS_HDT_CONSOLE debug information to the serial console. Warning: Only enable this option when debuging or tracing AMD AGESA code.
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.
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.
BOOT_MEDIA_SPI_BUS	cpu/x86	int		Most x86 systems which boot from SPI flash boot using bus 0.
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.
		(comment)		Northbridge
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.
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
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.
REDIRECT_NBCIMX_TRACE_TO_SERIAL	northbridge/amd/cimx/rd890	bool	Redirect AMD Northbridge CIMX Trace to serial console	This Option allows you to redirect the AMD Northbridge CIMX Trace debug information to the serial console. Warning: Only enable this option when debuging or tracing AMD CIMX code.
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
HAVE_CMC	southbridge/intel/sch	bool	Add a CMC state machine binary	Select this option to add a CMC state machine binary to the resulting coreboot image. Note: Without this binary coreboot will not work
CMC_FILE	southbridge/intel/sch	string	Intel CMC path and filename	The path and filename of the file to use as CMC state machine binary.
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_ON_RESUME_RO	southbridge/intel/bd82x6x	bool	Lock all flash ROM sections on S3 resume	If the flash ROM shall be protected against write accesses from the operating system (OS), the locking procedure has to be repeated after each resume from S3. Select this if you never want to update the flash ROM from within your OS. Notice: Even with this option, the write lock has still to be enabled on the normal boot path (e.g. by the payload).
LOCK_SPI_ON_RESUME_NO_ACCESS	southbridge/intel/bd82x6x	bool	Lock and disable reads all flash ROM sections on S3 resume	If the flash ROM shall be protected against all accesses from the operating system (OS), the locking procedure has to be repeated after each resume from S3. Select this if you never want to update the flash ROM from within your OS. Notice: Even with this option, the lock has still to be enabled on the normal boot path (e.g. by the payload).
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.
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_FWM_POSITION	southbridge/amd/pi/hudson	hex	Hudson Firmware ROM Position	Hudson requires the firmware MUST be located at a specific address (ROM start address + 0x20000), otherwise xhci host Controller can not find or load the xhci firmware. The firmware start address is dependent on the ROM chip size. The default offset is 0x20000 from the ROM start address, namely 0xFFF20000 if flash chip size is 1M 0xFFE20000 if flash chip size is 2M 0xFFC20000 if flash chip size is 4M 0xFF820000 if flash chip size is 8M 0xFF020000 if flash chip size is 16M
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
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.
SATA_CONTROLLER_MODE	southbridge/amd/cimx/sb700	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/sb700	bool		n = Disable PCI Bridge Device 14 Function 4. y = Enable PCI Bridge Device 14 Function 4.
ACPI_SCI_IRQ	southbridge/amd/cimx/sb700	hex		Set SCI IRQ to 9.
REDIRECT_SBCIMX_TRACE_TO_SERIAL	southbridge/amd/cimx/sb700	bool	Redirect AMD Southbridge CIMX Trace to serial console	This Option allows you to redirect the AMD Southbridge CIMX Trace debug information to the serial console. Warning: Only enable this option when debuging or tracing AMD CIMX code.
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_FWM_POSITION	southbridge/amd/agesa/hudson	hex	Hudson Firmware ROM Position	Hudson requires the firmware MUST be located at a specific address (ROM start address + 0x20000), otherwise xhci host Controller can not find or load the xhci firmware. The firmware start address is dependent on the ROM chip size. The default offset is 0x20000 from the ROM start address, namely 0xFFF20000 if flash chip size is 1M 0xFFE20000 if flash chip size is 2M 0xFFC20000 if flash chip size is 4M 0xFF820000 if flash chip size is 8M 0xFF020000 if flash chip size is 16M
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
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
		(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_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_EXTERNAL_FIRMWARE	ec/google/chromeec	hex		Disable building EC firmware if it's already built externally (and added manually.)
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_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_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 Fintec 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.
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.
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.
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_LOCATION	vendorcode/amd/pi	string	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.
VBNV_OFFSET	vendorcode/google/chromeos	hex		CMOS offset for VbNv data. This value must match cmos.layout in the mainboard directory, minus 14 bytes for the RTC.
CHROMEOS_VBNV_CMOS	vendorcode/google/chromeos	bool	Vboot non-volatile storage in CMOS.	VBNV is stored in CMOS
CHROMEOS_VBNV_CMOS_BACKUP_TO_FLASH	vendorcode/google/chromeos	bool	Back up Vboot non-volatile storage from CMOS to flash.	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.
CHROMEOS_VBNV_EC	vendorcode/google/chromeos	bool	Vboot non-volatile storage in EC.	VBNV is stored in EC
CHROMEOS_VBNV_FLASH	vendorcode/google/chromeos	bool		VBNV is stored in flash storage
EC_SOFTWARE_SYNC	vendorcode/google/chromeos	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 depthcharge should support EC software sync.
VBOOT_EC_SLOW_UPDATE	vendorcode/google/chromeos	bool	EC is slow to update	Whether the EC (or PD) is slow to update and needs to display a screen that informs the user the update is happening.
VBOOT_OPROM_MATTERS	vendorcode/google/chromeos	bool	Video option ROM matters	Whether the video option ROM has run matters on this platform.
VIRTUAL_DEV_SWITCH	vendorcode/google/chromeos	bool	Virtual developer switch support	Whether this platform has a virtual developer switch.
VBOOT_VERIFY_FIRMWARE	vendorcode/google/chromeos	bool	Verify firmware with vboot.	Enabling VBOOT_VERIFY_FIRMWARE will use vboot to verify the components of the firmware (stages, payload, etc).
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.
PHYSICAL_REC_SWITCH	vendorcode/google/chromeos	bool	Physical recovery switch is present	Whether this platform has a physical recovery switch
LID_SWITCH	vendorcode/google/chromeos	bool	Lid switch is present	Whether this platform has a lid switch
WIPEOUT_SUPPORTED	vendorcode/google/chromeos	bool	User is able to request factory reset	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
HAVE_REGULATORY_DOMAIN	vendorcode/google/chromeos	bool	Add regulatory domain methods	This option is needed to add ACPI regulatory domain methods
VBOOT_STARTS_IN_BOOTBLOCK	vendorcode/google/chromeos/vboot2	bool	Vboot starts verifying in bootblock	Firmware verification happens during or at the end of bootblock.
VBOOT_STARTS_IN_ROMSTAGE	vendorcode/google/chromeos/vboot2	bool	Vboot starts verifying in romstage	Firmware verification happens during or at the end of romstage.
VBOOT2_MOCK_SECDATA	vendorcode/google/chromeos/vboot2	bool	Mock secdata for firmware verification	Enabling VBOOT2_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	vendorcode/google/chromeos/vboot2	bool	Disable dev mode on recovery requests	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.
RETURN_FROM_VERSTAGE	vendorcode/google/chromeos/vboot2	bool	The separate verification stage returns to its caller	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.
CHIPSET_PROVIDES_VERSTAGE_MAIN_SYMBOL	vendorcode/google/chromeos/vboot2	bool	The chipset provides the main() entry point for verstage	The chipset code provides their own main() entry point.
VBOOT_DYNAMIC_WORK_BUFFER	vendorcode/google/chromeos/vboot2	bool	Vboot's work buffer is dynamically allocated.	This option is used when there isn't enough pre-main memory ram to allocate the vboot work buffer. That means vboot verification is after memory init and requires main memory to back the work buffer.
Menu: GBB configuration
Menu: Vboot Keys
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'
LATE_CBMEM_INIT	arch/x86	bool		Enable this in chipset's Kconfig if northbridge does not implement early get_top_of_ram() call for romstage. CBMEM tables will be allocated late in ramstage, after PCI devices resources are known.
Menu: Devices
MAINBOARD_DO_NATIVE_VGA_INIT	device	bool	Use native graphics initialization	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. If unsure, say N.
VGA_ROM_RUN	device	bool	Run VGA Option ROMs	Execute VGA Option ROMs in coreboot if found. This is required 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. If unsure, say N when using SeaBIOS as payload, Y otherwise.
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.
ON_DEVICE_ROM_LOAD	device	bool	Load Option ROMs on PCI devices	Load Option ROMs stored on PCI/PCIe/AGP 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.
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 on PCIe links.
PCIEXP_CLK_PM	device	bool	Enable PCIe Clock Power Management	Detect and enable Clock Power Management on PCIe.
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.
PCIEXP_L1_SUB_STATE	device	bool	Enable PCIe ASPM L1 SubState	Detect and enable ASPM on PCIe links.
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_MBI	device	bool	Add an MBI image	Select this option if you have an Intel MBI 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.
MBI_FILE	device	string	Intel MBI path and filename	The path and filename of the file to use as VGA BIOS.
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: 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).
FRAMEBUFFER_KEEP_VESA_MODE	device	bool	Keep 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 framebuffer driver. If this option is disabled, coreboot will switch back to text mode before handing control to a payload.
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.
Menu: Generic Drivers
ELOG	drivers/elog	bool	Support for flash based event log	Enable support for flash based event logging.
ELOG_FLASH_BASE	drivers/elog	hex	Event log offset into flash	Offset into the flash chip for the ELOG block. This should be allocated in the FMAP.
ELOG_AREA_SIZE	drivers/elog	hex	Size of Event Log area in flash	This should be a multiple of flash block size. Default is 4K.
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.	Use "select HAVE_USBDEBUG" on southbridges which have Debug Port code.
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 http://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_BEAGLEBONE	drivers/usb	bool	BeagleBone	Use this to configure the USB hub on BeagleBone board.
USBDEBUG_DONGLE_BEAGLEBONE_BLACK	drivers/usb	bool	BeagleBone Black	Use this with 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 115200, 8n1, no flow control.
SPI_FLASH	drivers/spi	bool		Select this option if your chipset driver needs to store certain data in the SPI flash.
SPI_ATOMIC_SEQUENCING	drivers/spi	bool		Select this option if the SPI controller uses "atomic sequencing." Atomic sequencing is when the sequence of commands is pre-programmed in the SPI controller. Hardware manages the transaction instead of software. This is common on x86 platforms.
SPI_FLASH_MEMORY_MAPPED	drivers/spi	bool		Inform system if SPI is memory-mapped or not.
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.
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.
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.
GIC	drivers/gic	None		This option enables GIC support, the ARM generic interrupt controller.
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.
MAINBOARD_HAS_LPC_TPM	drivers/pc80/tpm	bool		Board has TPM support
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.
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_IMAGE_ID_STRING	drivers/intel/fsp1_1	string	8 byte platform string identifying the FSP platform	8 ASCII character byte signature string that will help match the FSP binary to a supported hardware configuration.
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_DP	drivers/intel/gma	bool		helper functions for intel display port operations
INTEL_DDI	drivers/intel/gma	bool		helper functions for intel DDI operations
		(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.
PLATFORM_USES_FSP2_0	drivers/intel/fsp2_0	bool		Include FSP 2.0 wrappers and functionality
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_RTD2132	drivers/i2c/rtd2132	bool		Enable support for Realtek RTD2132 DisplayPort to LVDS bridge chip.
TPM	toplevel	bool		Enable this option to enable TPM support in coreboot. If unsure, say N.
Menu: Console
BOOTBLOCK_CONSOLE	console	bool	Enable early (bootblock) console output.	Use console during the bootblock 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
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_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.
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.
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.
VGA	toplevel	bool		Build board-specific VGA code.
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.
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_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 http://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 http://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 http://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	Tiano Core	Select this option if you want to build a coreboot image with a Tiano Core payload. If you don't know what this is about, just leave it enabled. See http://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 http://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 http://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	1.9.1	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"
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	2016.2	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 February, 2016.
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 firmware volume	The result of a corebootPkg build
GRUB2_MASTER	payloads/external/GRUB2	bool	HEAD	Newest GRUB2 version
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
PAYLOAD_FILE	payloads	string	Payload path and filename	The path and filename of the ELF executable file to use as payload.
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.
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
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.
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	If enabled, coreboot will wait for a GDB connection.
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_TPM	toplevel	bool	Output verbose TPM debug messages	This option enables additional TPM related debug messages.
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.
IASL_WARNINGS_ARE_ERRORS	toplevel	bool		Select to Fail the build if a IASL generates a warning. This will be defaulted to disabled for the platforms that currently fail. This allows the REST of the platforms to have this check enabled while we're working to get those boards fixed. DO NOT ADD TO ANY ADDITIONAL PLATFORMS INSTEAD OF FIXING THE ASL.
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.
CBFS_SIZE	toplevel	hex		This is the part of the ROM actually managed by CBFS. Set it to be equal to the full rom size if that hasn't been overridden by the chipset or mainboard.
DEBUG_BOOT_STATE	toplevel	bool		Control debugging of the boot state machine. When selected displays the state boundaries in ramstage.

Coreboot Options

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