Board:lenovo/x1 carbon gen1: Difference between revisions

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== Code ==
== Code ==
{{MergedIntoMaster}}
{{MergedIntoMaster}}
Make sure to check out 3rd party blobs.
cd ./coreboot/3rdparty
git clone http://review.coreboot.org/p/blobs.git


Please have a  look at [[Build_HOWTO]]. Start compiling crossgcc right now! It will take a while. You will build coreboot itself at a later time.
Please have a  look at [[Build_HOWTO]]. Start compiling crossgcc right now! It will take a while. You will build coreboot itself at a later time.
Line 975: Line 979:


==== Flashing Coreboot Internally ====
==== Flashing Coreboot Internally ====


Use the layout file to flash only the BIOS flash region, leaving IFD, ME, and GBE alone. Use the full 12M coreboot.rom image.
Use the layout file to flash only the BIOS flash region, leaving IFD, ME, and GBE alone. Use the full 12M coreboot.rom image.


  flashrom -p internal:laptop=force_I_want_a_brick -l ./x1c.layout -i bios -w ./build/coreboot.rom
  flashrom -p internal:laptop=force_I_want_a_brick -l ./x1c.layout -i bios -w ./build/coreboot.rom
If you are receiving errors during flashing you most likely need to pass <code>iomem=relaxed</code> as a kernel parameter at boot time before using flashrom.


Successful flash output:
Successful flash output:

Latest revision as of 21:59, 4 October 2017

Status

Intel_Native_Raminit has it's own status page.

Thanks for your interest in the Lenovo X1 Carbon 1st gen port. The X1 Carbon 1st gen is very similar to the Lenovo X230. See Board:lenovo/x230.

Issues

  • Powered USB 2.0 port isn't powered in power-off state.
  • S3 Suspend when resuming may cause black screen when not using a VGA option rom.
  • SeaBIOS flickers when not using a VGA option rom.
  • Bluetooth fails to load firmware. Unknown if related to coreboot. Needs more testing.
  • Keyboard backlight (fn + spacebar) has 4 modes instead of three. Two modes do not illuminate the keyboard (should be one), the remaining two modes illuminate the keyboard with low and high brightness as expected.

Tested

  • S3 (Suspend to memory)
  • S4 (Suspend to disk)
  • USB (both 2.0 and 3.0 ports)
  • ThinkPad USB 3.0 Ethernet Adapter (Device ID 17ef:7205)
  • Video (internal)
  • Sound (integrated speakers, integrated mic, external headphones)
  • WLAN (Centrino Advanced-N 6205)
  • WLAN toggle switch
  • Linux Boot / Install (SeaBIOS)
  • SD card reader (Ricoh Co Ltd PCIe SDXC/MMC Host Controller [1180:e823] (rev 07))
  • Thermal management
  • Fingerprint reader (147e:2020 Upek TouchChip Fingerprint Coprocessor)
  • Webcam
  • Trackpoint
  • Touchpad
  • Fn hotkeys
  • Physical hotkeys (power, audio mute, mic mute, volume)
  • Nvramcui as secondary payload
  • Keyboard backlight
  • Screen backlight
  • mSATA

Untested

  • Displayport
  • WWAN

Proprietary Components Status

  • CPU Microcode
  • VGA Option ROM (optional): you need it if you want graphics in SeaBIOS but most payloads should work without it (text mode or corebootfb mode)
  • ME (Management Engine) => you do not have to touch it (just leave it where it is)
  • EC (Embedded Controller) => you do not have to touch it (just leave it where it is)

Code

{{ #if: | * [{{{review_url}}} The code has been merged into coreboot master]: | * The code has been merged into coreboot master:}} 

 $ git clone https://review.coreboot.org/coreboot.git


Make sure to check out 3rd party blobs. 

cd ./coreboot/3rdparty
git clone http://review.coreboot.org/p/blobs.git

Please have a look at Build_HOWTO. Start compiling crossgcc right now! It will take a while. You will build coreboot itself at a later time.

Preparation

Required Tools

  • External flash programmer. A CH341A flash programmer was used for this guide. You can purchase these for under $10.00 USD.
  • SOIC8 clip for externally reading and flashing. This eliminates the need for any soldering. You can purchase these for around $12.00 USD.
  • Secondary system with flashrom installed. Another laptop with Linux installed was used while constructing this guide.

Update BIOS

It is a good idea to make sure you're on the latest firmware from Lenovo before flashing coreboot. This guide was written using the 2.75 bios.

Highly suggested: Install Linux and configure SSH before flashing coreboot to your X1 Carbon. This will allow you to troubleshoot from a running system if your display does not initialize after flashing.

Hardware Teardown

Proceeds as follows:

  1. Turn off your laptop, remove AC adapter.
  2. Detach the keyboard bezel assembly. You can keep the ribbon cable connected and pivot the keyboard assembly against the lid of the laptop.
  3. Remove main battery conectoy and cmos battery connector.

Mainboard Flash Layout - MX25L3273E and MX25L6406E

The X1 Carbon 1st gen has two flash chips of 4M (MX25L3273E) and 8M (MX25L6406E). The flash chips are located just above the mSATA SSD. They're concatenated to one virtual flash chip of 12M which is itself subdivided in roughly in 3 parts:

  • Descriptor (12K)
  • ME firmware (5M-12K)
  • System flash (7M)

ME firmware is not readable. Vendor firmware locks the flash and so you need to flash externally until you re-flash unlocked firmware.

When flashing coreboot you technically only need to flash the 4M MX25L3273E flash chip. You could follow this guide and flash coreboot without ever reading or writing to the 8M MX25L6406E, however you will need to read the 8M chip if you intend to extract the VGA BIOS.

Lenovo Firmware Backup

Before building and flashing coreboot we need to make a copy of the existing firmware.

MX25L3273E Backup

Connect your SOIC clip to the MX25L3273E flash chip (the left one). Insert the CH341A flash programmer into a USB port. Read the stock firmware twice from the 4M MX25L3273E flash chip: 

flashrom -p ch341a_spi -c MX25L3273E -r x1c_MX25L3273E_original_bios_1.bin
flashrom -p ch341a_spi -c MX25L3273E -r x1c_MX25L3273E_original_bios_2.bin

Compare the two images to ensure a successful read. 

sha256sum x1c_MX25L3273E_original_bios_1.bin  x1c_MX25L3273E_original_bios_2.bin

sha256sum output: 

b5bc2c096d53ed15fdbfe99c41bbb7ae9311366329cc19f611ba3f743c09b8e4  x1c_MX25L3273E_original_bios_1.bin 
b5bc2c096d53ed15fdbfe99c41bbb7ae9311366329cc19f611ba3f743c09b8e4  x1c_MX25L3273E_original_bios_2.bin

The hashes should match. If not, repeat the above steps. Your SOIC clip may require slight downward pressure during read and write operations. You'll need to get a feel for the clip. Some are made better than others.

Consolidate and rename your extracted firmware images (MX25L3273E) 

rm x1c_MX25L3273E_original_bios_2.bin
mv x1c_MX25L3273E_original_bios_1.bin x1c_MX25L3273E_original_bios.bin

MX25L6406E Backup

Connect your SOIC clip to the MX25L6406E flash chip (the right one). Insert the CH341A flash programmer into a USB port. Read the stock firmware two separate times from the 8M MX25L6406E flash chip: 

flashrom -p ch341a_spi -c "MX25L6406E/MX25L6408E" -r x1c_MX25L6406E_original_bios1.bin
flashrom -p ch341a_spi -c "MX25L6406E/MX25L6408E" -r x1c_MX25L6406E_original_bios2.bin

Compare the two images to ensure a successful read. 

sha256sum x1c_MX25L6406E_original_bios1.bin x1c_MX25L6406E_original_bios2.bin

sha256sum output: 

affd1adb758e971650c81a495fff5c5cfd88a206e2da6cf81a1032835a5d52c7  x1c_MX25L6406E_original_bios1.bin
affd1adb758e971650c81a495fff5c5cfd88a206e2da6cf81a1032835a5d52c7  x1c_MX25L6406E_original_bios2.bin

The hashes should match. If not, repeat the above steps.

Consolidate and rename your extracted firmware images (MX25L6406E) 

rm x1c_MX25L6406E_original_bios2.bin
mv x1c_MX25L6406E_original_bios1.bin x1c_MX25L6406E_original_bios.bin

12M Virtual Flash Image

After successfully extracting the firmware from both flash chips, combine the 4M and 8M firmware images into the full 12M virtual flash image. 

cat x1c_MX25L3273E_original_bios.bin x1c_MX25L6406E_original_bios.bin > x1c_original_bios.bin

Extract VGA BIOS - UEFITool

Pleaes see VGA_support.

Use git to clone the UEFITool repository and build UEFITool. Requires qt5base-devel package in Ubuntu 16.04. See the included README. 

git clone https://github.com/LongSoft/UEFITool.git
cd ./UEFITool

Build UEFITool 

/usr/lib/x86_64-linux-gnu/qt5/bin/qmake /uefitool.pro
make release

Launch UEFITool

  1. Open the 12M combined bios file (x1c_original_bios.bin) - File -> Open image file…
  2. Search for text "VGA Compatible BIOS" (uncheck unicode) - File -> Search
  3. Double click search the search result. This will highlight the raw section.
  4. Right click highlighted raw section and select Extract Body.... Save the extracted file. This is your extracted vga bios - 'x1c_vga_bios.img'.


Run sha256sum to calculate the checksum: 

sha256sum x1c_vga_bios.img

Output: 

2ffad3deec22bde663721c496de5792a0429f5732145f0782bb389dda3ac7ed6  x1c_vga_bios.img

We’ll come back to this vga bios file when it’s time to build coreboot.

Build Coreboot

Building Firmware

Please have a look at Intel_Sandybridge_Build_Tutorial.

In the coreboot directory you can configure the build-time options of coreboot with nconfig. 

make nconfig

Expand this to view recommended nconfig options: 

General Setup

[*] Use CMOS for configuration values
[*] Compress ramstage with LZMA
[*] Include the coreboot .config file into the ROM image 

Mainboard

Mainboard vendor (Lenovo)
Mainboard model (ThinkPad X1 carbon gen 1)
ROM chip size (12288 KB (12 MB))
(0x100000) Size of CBFS filesystem in ROM

Chipset

[*] Enable VMX for virtualization 
[*]   Set lock bit after configuring VMX
[*]   Build with a fake IFD

Devices

[ ] Use native graphics initialization
[ ] Run VGA Option ROMs 
[*] Enable PCIe Clock Power Management
[*] Enable PCIe ASPM L1 SubState
[*] Add a VGA BIOS image
   (x1c_vga_bios.img) VGA BIOS path and filename
   (8086,0166) VGA device PCI IDs

Generic Drivers

[*] Support Intel PCI-e WiFi adapters
[*] PS/2 keyboard init

Console (Defaults)

[*] Squelch AP CPUs from early console.
[*] Send console output to a CBMEM buffer
(0x20000) Room allocated for console output in CBMEM
[*] Send POST codes to an external device
[*] Send POST codes to an IO port
(0x80)IO port for POST codes 

System Tables

[*] Generate SMBIOS tables   

Payload

Add a payload (SeaBIOS)
   SeaBIOS version (master)
   (10) PS/2 keyboard controller initialization timeout (milliseconds)
[*] Use LZMA compression for payloads
   Secondary Payloads--->
      [*] Load nvramcui as a secondary payload

Recommended '.config' file included for reference with the above configuration (SeaBios, nvramcui, VGA BIOS image).

Expand this to view .config contents: 

#
# Automatically generated file; DO NOT EDIT.
# coreboot configuration
#

#
# General setup
#
CONFIG_COREBOOT_BUILD=y
CONFIG_LOCALVERSION=""
CONFIG_CBFS_PREFIX="fallback"
CONFIG_COMPILER_GCC=y
# CONFIG_COMPILER_LLVM_CLANG is not set
# CONFIG_ANY_TOOLCHAIN is not set
# CONFIG_CCACHE is not set
# CONFIG_FMD_GENPARSER is not set
# CONFIG_UTIL_GENPARSER is not set
CONFIG_USE_OPTION_TABLE=y
# CONFIG_STATIC_OPTION_TABLE is not set
CONFIG_COMPRESS_RAMSTAGE=y
CONFIG_INCLUDE_CONFIG_FILE=y
# CONFIG_COLLECT_TIMESTAMPS is not set
# CONFIG_USE_BLOBS is not set
# CONFIG_COVERAGE is not set
CONFIG_RELOCATABLE_RAMSTAGE=y
# CONFIG_UPDATE_IMAGE is not set
# CONFIG_BOOTSPLASH_IMAGE is not set

#
# Mainboard
#

#
# Important: Run 'make distclean' before switching boards
#
# CONFIG_VENDOR_A_TREND is not set
# CONFIG_VENDOR_AAEON is not set
# CONFIG_VENDOR_ABIT is not set
# CONFIG_VENDOR_ADI is not set
# CONFIG_VENDOR_ADLINK is not set
# CONFIG_VENDOR_ADVANSUS is not set
# CONFIG_VENDOR_AMD is not set
# CONFIG_VENDOR_AOPEN is not set
# CONFIG_VENDOR_APPLE is not set
# CONFIG_VENDOR_ARTECGROUP is not set
# CONFIG_VENDOR_ASROCK is not set
# CONFIG_VENDOR_ASUS is not set
# CONFIG_VENDOR_AVALUE is not set
# CONFIG_VENDOR_AZZA is not set
# CONFIG_VENDOR_BACHMANN is not set
# CONFIG_VENDOR_BAP is not set
# CONFIG_VENDOR_BCOM is not set
# CONFIG_VENDOR_BIFFEROS is not set
# CONFIG_VENDOR_BIOSTAR is not set
# CONFIG_VENDOR_BROADCOM is not set
# CONFIG_VENDOR_COMPAQ is not set
# CONFIG_VENDOR_CUBIETECH is not set
# CONFIG_VENDOR_DIGITALLOGIC is not set
# CONFIG_VENDOR_DMP is not set
# CONFIG_VENDOR_ECS is not set
# CONFIG_VENDOR_ELMEX is not set
# CONFIG_VENDOR_EMULATION is not set
# CONFIG_VENDOR_ESD is not set
# CONFIG_VENDOR_GETAC is not set
# CONFIG_VENDOR_GIGABYTE is not set
# CONFIG_VENDOR_GIZMOSPHERE is not set
# CONFIG_VENDOR_GOOGLE is not set
# CONFIG_VENDOR_HP is not set
# CONFIG_VENDOR_IBASE is not set
# CONFIG_VENDOR_IEI is not set
# CONFIG_VENDOR_INTEL is not set
# CONFIG_VENDOR_IWAVE is not set
# CONFIG_VENDOR_IWILL is not set
# CONFIG_VENDOR_JETWAY is not set
# CONFIG_VENDOR_KONTRON is not set
# CONFIG_VENDOR_LANNER is not set
CONFIG_VENDOR_LENOVO=y
# CONFIG_VENDOR_LINUTOP is not set
# CONFIG_VENDOR_LIPPERT is not set
# CONFIG_VENDOR_LOWRISC is not set
# CONFIG_VENDOR_MITAC is not set
# CONFIG_VENDOR_MSI is not set
# CONFIG_VENDOR_NEC is not set
# CONFIG_VENDOR_NOKIA is not set
# CONFIG_VENDOR_NVIDIA is not set
# CONFIG_VENDOR_PACKARDBELL is not set
# CONFIG_VENDOR_PCENGINES is not set
# CONFIG_VENDOR_PURISM is not set
# CONFIG_VENDOR_RCA is not set
# CONFIG_VENDOR_RODA is not set
# CONFIG_VENDOR_SAMSUNG is not set
# CONFIG_VENDOR_SAPPHIRE is not set
# CONFIG_VENDOR_SIEMENS is not set
# CONFIG_VENDOR_SOYO is not set
# CONFIG_VENDOR_SUNW is not set
# CONFIG_VENDOR_SUPERMICRO is not set
# CONFIG_VENDOR_TECHNEXION is not set
# CONFIG_VENDOR_THOMSON is not set
# CONFIG_VENDOR_TI is not set
# CONFIG_VENDOR_TRAVERSE is not set
# CONFIG_VENDOR_TYAN is not set
# CONFIG_VENDOR_VIA is not set
# CONFIG_VENDOR_WINENT is not set
# CONFIG_VENDOR_WYSE is not set
CONFIG_BOARD_SPECIFIC_OPTIONS=y
CONFIG_MAINBOARD_DIR="lenovo/x1_carbon_gen1"
CONFIG_MAINBOARD_PART_NUMBER="ThinkPad X1 carbon gen 1"
CONFIG_MAINBOARD_VENDOR="LENOVO"
CONFIG_MAX_CPUS=8
CONFIG_CACHE_ROM_SIZE_OVERRIDE=0x0
CONFIG_CBFS_SIZE=0x100000
CONFIG_PAYLOAD_CONFIGFILE=""
CONFIG_VGA_BIOS_ID="8086,0166"
# CONFIG_ONBOARD_VGA_IS_PRIMARY is not set
CONFIG_DIMM_SPD_SIZE=256
CONFIG_VGA_BIOS=y
CONFIG_DCACHE_RAM_BASE=0xfefe0000
CONFIG_DCACHE_RAM_SIZE=0x20000
CONFIG_VGA_BIOS_FILE="x1c_vga_bios.img"
CONFIG_MAINBOARD_PCI_SUBSYSTEM_VENDOR_ID=0x17aa
CONFIG_MAINBOARD_PCI_SUBSYSTEM_DEVICE_ID=0x21fa
# CONFIG_HAVE_IFD_BIN is not set
# CONFIG_HAVE_ME_BIN is not set
CONFIG_MMCONF_BASE_ADDRESS=0xf8000000
CONFIG_DRAM_RESET_GATE_GPIO=10
CONFIG_POST_IO=y
CONFIG_DEVICETREE="devicetree.cb"
CONFIG_MAX_REBOOT_CNT=3
# CONFIG_MAINBOARD_DO_NATIVE_VGA_INIT is not set
CONFIG_ID_SECTION_OFFSET=0x80
CONFIG_POST_DEVICE=y
CONFIG_USBDEBUG_HCD_INDEX=2
CONFIG_IFD_BIOS_SECTION=""
CONFIG_IFD_ME_SECTION=""
# CONFIG_VBOOT is not set
CONFIG_BOOT_DEVICE_SPI_FLASH_BUS=0
CONFIG_PRERAM_CBMEM_CONSOLE_SIZE=0xc00
# CONFIG_DRIVERS_UART_8250IO is not set
CONFIG_FMDFILE=""
CONFIG_IFD_GBE_SECTION=""
# CONFIG_BOARD_LENOVO_G505S is not set
# CONFIG_BOARD_LENOVO_L520 is not set
# CONFIG_BOARD_LENOVO_R400 is not set
# CONFIG_BOARD_LENOVO_S230U is not set
# CONFIG_BOARD_LENOVO_T400 is not set
# CONFIG_BOARD_LENOVO_T420 is not set
# CONFIG_BOARD_LENOVO_T420S is not set
# CONFIG_BOARD_LENOVO_T430S is not set
# CONFIG_BOARD_LENOVO_T500 is not set
# CONFIG_BOARD_LENOVO_T520 is not set
# CONFIG_BOARD_LENOVO_T530 is not set
# CONFIG_BOARD_LENOVO_T60 is not set
CONFIG_BOARD_LENOVO_X1_CARBON_GEN1=y
# CONFIG_BOARD_LENOVO_X200 is not set
# CONFIG_BOARD_LENOVO_X201 is not set
# CONFIG_BOARD_LENOVO_X220 is not set
# CONFIG_BOARD_LENOVO_X220I is not set
# CONFIG_BOARD_LENOVO_X230 is not set
# CONFIG_BOARD_LENOVO_X60 is not set
CONFIG_CPU_ADDR_BITS=36
CONFIG_DEFAULT_CONSOLE_LOGLEVEL=8
# CONFIG_USBDEBUG is not set
CONFIG_DRIVERS_PS2_KEYBOARD=y
# CONFIG_NO_POST is not set
CONFIG_BOARD_ROMSIZE_KB_12288=y
# CONFIG_COREBOOT_ROMSIZE_KB_64 is not set
# CONFIG_COREBOOT_ROMSIZE_KB_128 is not set
# CONFIG_COREBOOT_ROMSIZE_KB_256 is not set
# CONFIG_COREBOOT_ROMSIZE_KB_512 is not set
# CONFIG_COREBOOT_ROMSIZE_KB_1024 is not set
# CONFIG_COREBOOT_ROMSIZE_KB_2048 is not set
# CONFIG_COREBOOT_ROMSIZE_KB_4096 is not set
# CONFIG_COREBOOT_ROMSIZE_KB_8192 is not set
CONFIG_COREBOOT_ROMSIZE_KB_12288=y
# CONFIG_COREBOOT_ROMSIZE_KB_16384 is not set
# CONFIG_COREBOOT_ROMSIZE_KB_32768 is not set
# CONFIG_COREBOOT_ROMSIZE_KB_65536 is not set
CONFIG_COREBOOT_ROMSIZE_KB=12288
CONFIG_ROM_SIZE=0xc00000
# CONFIG_MAINBOARD_HAS_TPM2 is not set
CONFIG_SYSTEM_TYPE_LAPTOP=y
# CONFIG_CBFS_AUTOGEN_ATTRIBUTES is not set

#
# Chipset
#

#
# SoC
#
# CONFIG_SOC_BROADCOM_CYGNUS is not set
CONFIG_BOOTBLOCK_CPU_INIT="cpu/intel/model_206ax/bootblock.c"
CONFIG_CPU_SPECIFIC_OPTIONS=y
CONFIG_C_ENV_BOOTBLOCK_SIZE=0x10000
CONFIG_X86_TOP4G_BOOTMEDIA_MAP=y
CONFIG_ROMSTAGE_ADDR=0x2000000
CONFIG_VERSTAGE_ADDR=0x2000000
CONFIG_HEAP_SIZE=0x4000
CONFIG_SPI_FLASH_INCLUDE_ALL_DRIVERS=y
CONFIG_SMM_TSEG_SIZE=0x800000
CONFIG_DCACHE_RAM_MRC_VAR_SIZE=0x0
CONFIG_BUILD_WITH_FAKE_IFD=y
CONFIG_BOOTBLOCK_NORTHBRIDGE_INIT="northbridge/intel/sandybridge/bootblock.c"
CONFIG_BOOTBLOCK_SOUTHBRIDGE_INIT="southbridge/intel/bd82x6x/bootblock.c"
CONFIG_CACHE_MRC_SIZE_KB=512
CONFIG_EHCI_BAR=0xfef00000
CONFIG_SERIRQ_CONTINUOUS_MODE=y
CONFIG_RAMTOP=0x200000
CONFIG_CONSOLE_CBMEM=y
CONFIG_UART_PCI_ADDR=0x0
CONFIG_HPET_MIN_TICKS=0x80
# CONFIG_SOC_INTEL_KABYLAKE is not set
# CONFIG_SOC_LOWRISC_LOWRISC is not set
# CONFIG_SOC_MARVELL_ARMADA38X is not set
# CONFIG_SOC_MARVELL_BG4CD is not set
# CONFIG_SOC_MARVELL_MVMAP2315 is not set
# CONFIG_SOC_MEDIATEK_MT8173 is not set
# CONFIG_SOC_NVIDIA_TEGRA124 is not set
# CONFIG_SOC_NVIDIA_TEGRA210 is not set
# CONFIG_SOC_QC_IPQ40XX is not set
# CONFIG_SOC_QC_IPQ806X is not set
# CONFIG_SOC_ROCKCHIP_RK3288 is not set
# CONFIG_SOC_ROCKCHIP_RK3399 is not set
# CONFIG_CPU_SAMSUNG_EXYNOS5250 is not set
# CONFIG_CPU_SAMSUNG_EXYNOS5420 is not set
# CONFIG_SOC_UCB_RISCV is not set

#
# CPU
#
# CONFIG_CPU_ALLWINNER_A10 is not set
CONFIG_SOCKET_SPECIFIC_OPTIONS=y
CONFIG_XIP_ROM_SIZE=0x20000
CONFIG_NUM_IPI_STARTS=2
# CONFIG_CPU_AMD_AGESA is not set
# CONFIG_CPU_AMD_PI is not set
# CONFIG_CPU_ARMLTD_CORTEX_A9 is not set
CONFIG_CPU_INTEL_MODEL_306AX=y
CONFIG_SSE2=y
CONFIG_CPU_INTEL_SOCKET_RPGA989=y
# CONFIG_CPU_INTEL_FIRMWARE_INTERFACE_TABLE is not set
# CONFIG_CPU_INTEL_TURBO_NOT_PACKAGE_SCOPED is not set
CONFIG_CPU_INTEL_COMMON=y
CONFIG_ENABLE_VMX=y
CONFIG_SET_VMX_LOCK_BIT=y
# CONFIG_CPU_TI_AM335X is not set
# CONFIG_PARALLEL_CPU_INIT is not set
# CONFIG_PARALLEL_MP is not set
# CONFIG_UDELAY_IO is not set
CONFIG_UDELAY_LAPIC=y
CONFIG_LAPIC_MONOTONIC_TIMER=y
# CONFIG_UDELAY_TSC is not set
# CONFIG_UDELAY_TIMER2 is not set
# CONFIG_TSC_SYNC_LFENCE is not set
CONFIG_TSC_SYNC_MFENCE=y
# CONFIG_NO_FIXED_XIP_ROM_SIZE is not set
CONFIG_LOGICAL_CPUS=y
CONFIG_SMM_TSEG=y
CONFIG_SMM_MODULE_HEAP_SIZE=0x4000
# CONFIG_SMM_LAPIC_REMAP_MITIGATION is not set
# CONFIG_SERIALIZED_SMM_INITIALIZATION is not set
# CONFIG_X86_AMD_FIXED_MTRRS is not set
# CONFIG_PLATFORM_USES_FSP1_0 is not set
# CONFIG_MIRROR_PAYLOAD_TO_RAM_BEFORE_LOADING is not set
# CONFIG_SOC_SETS_MSRS is not set
CONFIG_CACHE_AS_RAM=y
# CONFIG_NO_CAR_GLOBAL_MIGRATION is not set
CONFIG_SMP=y
CONFIG_AP_SIPI_VECTOR=0xfffff000
CONFIG_MMX=y
CONFIG_SSE=y
CONFIG_SUPPORT_CPU_UCODE_IN_CBFS=y
# CONFIG_USES_MICROCODE_HEADER_FILES is not set
CONFIG_CPU_MICROCODE_CBFS_GENERATE=y
# CONFIG_CPU_MICROCODE_CBFS_EXTERNAL_HEADER is not set
# CONFIG_CPU_MICROCODE_CBFS_NONE is not set
# CONFIG_CPU_MICROCODE_MULTIPLE_FILES is not set
CONFIG_CPU_UCODE_BINARIES=""

#
# Northbridge
#
# CONFIG_NORTHBRIDGE_AMD_AGESA is not set
# CONFIG_NO_MMCONF_SUPPORT is not set
# CONFIG_AMD_NB_CIMX is not set
# CONFIG_NORTHBRIDGE_AMD_CIMX_RD890 is not set
CONFIG_VIDEO_MB=0
# CONFIG_NORTHBRIDGE_AMD_PI is not set
CONFIG_RAMBASE=0x100000
CONFIG_NORTHBRIDGE_INTEL_COMMON_MRC_CACHE=y
CONFIG_MRC_CACHE_SIZE=0x10000
CONFIG_NORTHBRIDGE_INTEL_IVYBRIDGE=y
CONFIG_USE_NATIVE_RAMINIT=y
CONFIG_SANDYBRIDGE_IVYBRIDGE_LVDS=y
CONFIG_HPET_ADDRESS=0xfed00000
CONFIG_MAX_PIRQ_LINKS=4

#
# Southbridge
#
# CONFIG_AMD_SB_CIMX is not set
# CONFIG_SOUTHBRIDGE_AMD_CIMX_SB800 is not set
# CONFIG_SOUTHBRIDGE_AMD_CIMX_SB900 is not set
CONFIG_SOUTHBRIDGE_INTEL_C216=y
CONFIG_SOUTH_BRIDGE_OPTIONS=y
CONFIG_LOCK_SPI_ON_RESUME_NONE=y
# CONFIG_LOCK_SPI_ON_RESUME_RO is not set
# CONFIG_LOCK_SPI_ON_RESUME_NO_ACCESS is not set
CONFIG_SOUTHBRIDGE_INTEL_COMMON=y
CONFIG_SOUTHBRIDGE_INTEL_COMMON_GPIO=y
# CONFIG_LOCK_MANAGEMENT_ENGINE is not set

#
# Super I/O
#
# CONFIG_SUPERIO_NUVOTON_NCT6776_COM_A is not set

#
# Embedded Controllers
#
CONFIG_EC_ACPI=y
CONFIG_EC_LENOVO_H8=y
CONFIG_SEABIOS_PS2_TIMEOUT=10
CONFIG_EC_LENOVO_PMH7=y
CONFIG_HAVE_INTEL_FIRMWARE=y

#
# Intel Firmware
#
CONFIG_IFD_PLATFORM_SECTION=""

#
# Verified Boot (vboot)
#
# CONFIG_MAINBOARD_HAS_CHROMEOS is not set
# CONFIG_GOOGLE_SMBIOS_MAINBOARD_VERSION is not set
# CONFIG_UEFI_2_4_BINDING is not set
# CONFIG_UDK_2015_BINDING is not set
# CONFIG_USE_SIEMENS_HWILIB is not set
# CONFIG_ARCH_ARM is not set
# CONFIG_ARCH_BOOTBLOCK_ARM is not set
# CONFIG_ARCH_VERSTAGE_ARM is not set
# CONFIG_ARCH_ROMSTAGE_ARM is not set
# CONFIG_ARCH_RAMSTAGE_ARM is not set
# CONFIG_ARCH_BOOTBLOCK_ARMV4 is not set
# CONFIG_ARCH_VERSTAGE_ARMV4 is not set
# CONFIG_ARCH_ROMSTAGE_ARMV4 is not set
# CONFIG_ARCH_RAMSTAGE_ARMV4 is not set
# CONFIG_ARCH_BOOTBLOCK_ARMV7 is not set
# CONFIG_ARCH_VERSTAGE_ARMV7 is not set
# CONFIG_ARCH_ROMSTAGE_ARMV7 is not set
# CONFIG_ARCH_RAMSTAGE_ARMV7 is not set
# CONFIG_ARCH_BOOTBLOCK_ARMV7_M is not set
# CONFIG_ARCH_VERSTAGE_ARMV7_M is not set
# CONFIG_ARCH_BOOTBLOCK_ARMV7_R is not set
# CONFIG_ARCH_VERSTAGE_ARMV7_R is not set
# CONFIG_ARCH_ROMSTAGE_ARMV7_R is not set
# CONFIG_ARCH_RAMSTAGE_ARMV7_R is not set
# CONFIG_ARM_LPAE is not set
# CONFIG_ARCH_ARM64 is not set
# CONFIG_ARCH_BOOTBLOCK_ARM64 is not set
# CONFIG_ARCH_VERSTAGE_ARM64 is not set
# CONFIG_ARCH_ROMSTAGE_ARM64 is not set
# CONFIG_ARCH_RAMSTAGE_ARM64 is not set
# CONFIG_ARCH_BOOTBLOCK_ARMV8_64 is not set
# CONFIG_ARCH_VERSTAGE_ARMV8_64 is not set
# CONFIG_ARCH_ROMSTAGE_ARMV8_64 is not set
# CONFIG_ARCH_RAMSTAGE_ARMV8_64 is not set
# CONFIG_ARM64_A53_ERRATUM_843419 is not set
# CONFIG_ARCH_MIPS is not set
# CONFIG_ARCH_BOOTBLOCK_MIPS is not set
# CONFIG_ARCH_VERSTAGE_MIPS is not set
# CONFIG_ARCH_ROMSTAGE_MIPS is not set
# CONFIG_ARCH_RAMSTAGE_MIPS is not set
# CONFIG_ARCH_POWER8 is not set
# CONFIG_ARCH_BOOTBLOCK_POWER8 is not set
# CONFIG_ARCH_VERSTAGE_POWER8 is not set
# CONFIG_ARCH_ROMSTAGE_POWER8 is not set
# CONFIG_ARCH_RAMSTAGE_POWER8 is not set
# CONFIG_ARCH_RISCV is not set
# CONFIG_ARCH_BOOTBLOCK_RISCV is not set
# CONFIG_ARCH_VERSTAGE_RISCV is not set
# CONFIG_ARCH_ROMSTAGE_RISCV is not set
# CONFIG_ARCH_RAMSTAGE_RISCV is not set
CONFIG_ARCH_X86=y
CONFIG_ARCH_BOOTBLOCK_X86_32=y
CONFIG_ARCH_VERSTAGE_X86_32=y
CONFIG_ARCH_ROMSTAGE_X86_32=y
CONFIG_ARCH_RAMSTAGE_X86_32=y
# CONFIG_ARCH_BOOTBLOCK_X86_64 is not set
# CONFIG_ARCH_VERSTAGE_X86_64 is not set
# CONFIG_ARCH_ROMSTAGE_X86_64 is not set
# CONFIG_ARCH_RAMSTAGE_X86_64 is not set
# CONFIG_USE_MARCH_586 is not set
# CONFIG_AP_IN_SIPI_WAIT is not set
# CONFIG_SIPI_VECTOR_IN_ROM is not set
# CONFIG_ROMCC is not set
# CONFIG_LATE_CBMEM_INIT is not set
CONFIG_PC80_SYSTEM=y
# CONFIG_BOOTBLOCK_DEBUG_SPINLOOP is not set
# CONFIG_BOOTBLOCK_SAVE_BIST_AND_TIMESTAMP is not set
CONFIG_HAVE_CMOS_DEFAULT=y
CONFIG_CMOS_DEFAULT_FILE="src/mainboard/$(MAINBOARDDIR)/cmos.default"
CONFIG_IOAPIC_INTERRUPTS_ON_FSB=y
# CONFIG_IOAPIC_INTERRUPTS_ON_APIC_SERIAL_BUS is not set
# CONFIG_POSTCAR_STAGE is not set
# CONFIG_VERSTAGE_DEBUG_SPINLOOP is not set
# CONFIG_ROMSTAGE_DEBUG_SPINLOOP is not set
CONFIG_BOOTBLOCK_SIMPLE=y
# CONFIG_BOOTBLOCK_NORMAL is not set
CONFIG_BOOTBLOCK_SOURCE="bootblock_simple.c"

#
# Devices
#
CONFIG_MAINBOARD_HAS_NATIVE_VGA_INIT=y
CONFIG_MAINBOARD_HAS_NATIVE_VGA_INIT_TEXTMODECFG=y
CONFIG_MAINBOARD_HAS_LIBGFXINIT=y
# CONFIG_VGA_ROM_RUN is not set
# CONFIG_ON_DEVICE_ROM_LOAD is not set
# CONFIG_MULTIPLE_VGA_ADAPTERS is not set
# CONFIG_SMBUS_HAS_AUX_CHANNELS is not set
CONFIG_PCI=y
CONFIG_MMCONF_SUPPORT=y
# CONFIG_HYPERTRANSPORT_PLUGIN_SUPPORT is not set
CONFIG_PCIX_PLUGIN_SUPPORT=y
CONFIG_CARDBUS_PLUGIN_SUPPORT=y
# CONFIG_AZALIA_PLUGIN_SUPPORT is not set
CONFIG_PCIEXP_PLUGIN_SUPPORT=y
CONFIG_PCIEXP_COMMON_CLOCK=y
CONFIG_PCIEXP_ASPM=y
CONFIG_PCIEXP_CLK_PM=y
CONFIG_PCIEXP_L1_SUB_STATE=y
# CONFIG_EARLY_PCI_BRIDGE is not set
CONFIG_SUBSYSTEM_VENDOR_ID=0x0000
CONFIG_SUBSYSTEM_DEVICE_ID=0x0000
# CONFIG_SOFTWARE_I2C is not set

#
# Generic Drivers
#
# CONFIG_DRIVERS_AS3722_RTC is not set
# CONFIG_GIC is not set
# CONFIG_IPMI_KCS is not set
# CONFIG_DRIVERS_LENOVO_WACOM is not set
# CONFIG_DRIVERS_LENOVO_HYBRID_GRAPHICS is not set
CONFIG_SPI_FLASH=y
CONFIG_BOOT_DEVICE_SPI_FLASH_RW_NOMMAP=y
# CONFIG_BOOT_DEVICE_SPI_FLASH_RW_NOMMAP_EARLY is not set
# CONFIG_SPI_FLASH_SMM is not set
# CONFIG_SPI_FLASH_NO_FAST_READ is not set
CONFIG_SPI_FLASH_ADESTO=y
CONFIG_SPI_FLASH_AMIC=y
CONFIG_SPI_FLASH_ATMEL=y
CONFIG_SPI_FLASH_EON=y
CONFIG_SPI_FLASH_GIGADEVICE=y
CONFIG_SPI_FLASH_MACRONIX=y
CONFIG_SPI_FLASH_SPANSION=y
CONFIG_SPI_FLASH_SST=y
CONFIG_SPI_FLASH_STMICRO=y
CONFIG_SPI_FLASH_WINBOND=y
# CONFIG_SPI_FLASH_FAST_READ_DUAL_OUTPUT_3B is not set
# CONFIG_SPI_FLASH_HAS_VOLATILE_GROUP is not set
# CONFIG_HAVE_SPI_CONSOLE_SUPPORT is not set
# CONFIG_DRIVERS_STORAGE is not set
# CONFIG_DRIVERS_UART is not set
CONFIG_NO_UART_ON_SUPERIO=y
# CONFIG_UART_OVERRIDE_INPUT_CLOCK_DIVIDER is not set
# CONFIG_UART_OVERRIDE_REFCLK is not set
# CONFIG_DRIVERS_UART_8250MEM is not set
# CONFIG_DRIVERS_UART_8250MEM_32 is not set
# CONFIG_HAVE_UART_SPECIAL is not set
# CONFIG_DRIVERS_UART_OXPCIE is not set
# CONFIG_DRIVERS_UART_PL011 is not set
# CONFIG_UART_USE_REFCLK_AS_INPUT_CLOCK is not set
CONFIG_HAVE_USBDEBUG=y
CONFIG_HAVE_USBDEBUG_OPTIONS=y
CONFIG_SMBIOS_PROVIDED_BY_MOBO=y
# CONFIG_DRIVERS_I2C_MAX98927 is not set
# CONFIG_DRIVERS_I2C_PCF8523 is not set
# CONFIG_DRIVERS_I2C_RTD2132 is not set
# CONFIG_DRIVERS_I2C_RX6110SA is not set
# CONFIG_MAINBOARD_HAS_I2C_TPM_ATMEL is not set
# CONFIG_MAINBOARD_HAS_I2C_TPM_CR50 is not set
# CONFIG_INTEL_DP is not set
# CONFIG_INTEL_DDI is not set
# CONFIG_INTEL_EDID is not set
CONFIG_INTEL_INT15=y
CONFIG_INTEL_GMA_ACPI=y
# CONFIG_INTEL_GMA_SSC_ALTERNATE_REF is not set
CONFIG_GFX_GMA=y
CONFIG_GFX_GMA_CPU="Ivybridge"
CONFIG_GFX_GMA_CPU_VARIANT="Normal"
# CONFIG_GFX_GMA_INTERNAL_IS_EDP is not set
CONFIG_GFX_GMA_INTERNAL_IS_LVDS=y
CONFIG_GFX_GMA_INTERNAL_PORT="LVDS"
# CONFIG_GFX_GMA_ANALOG_I2C_HDMI_B is not set
# CONFIG_GFX_GMA_ANALOG_I2C_HDMI_C is not set
# CONFIG_GFX_GMA_ANALOG_I2C_HDMI_D is not set
CONFIG_GFX_GMA_ANALOG_I2C_PORT="PCH_DAC"
# CONFIG_DRIVER_INTEL_I210 is not set
# CONFIG_DRIVERS_INTEL_MIPI_CAMERA is not set
CONFIG_DRIVERS_INTEL_WIFI=y
# CONFIG_USE_SAR is not set
# CONFIG_DRIVER_MAXIM_MAX77686 is not set
# CONFIG_DRIVER_PARADE_PS8625 is not set
# CONFIG_DRIVER_PARADE_PS8640 is not set
CONFIG_DRIVERS_MC146818=y
CONFIG_MAINBOARD_HAS_LPC_TPM=y
# CONFIG_LPC_TPM is not set
CONFIG_DRIVERS_RICOH_RCE822=y
# CONFIG_DRIVER_SIEMENS_NC_FPGA is not set
# CONFIG_DRIVERS_SIL_3114 is not set
# CONFIG_MAINBOARD_HAS_SPI_TPM_CR50 is not set
# CONFIG_DRIVER_TI_TPS65090 is not set
# CONFIG_DRIVERS_TI_TPS65913 is not set
# CONFIG_DRIVERS_TI_TPS65913_RTC is not set
# CONFIG_DRIVER_XPOWERS_AXP209 is not set
CONFIG_ACPI_SATA_GENERATOR=y
CONFIG_ACPI_INTEL_HARDWARE_SLEEP_VALUES=y
# CONFIG_BOOT_DEVICE_NOT_SPI_FLASH is not set
CONFIG_BOOT_DEVICE_SPI_FLASH=y
CONFIG_BOOT_DEVICE_MEMORY_MAPPED=y
# CONFIG_BOOT_DEVICE_SUPPORTS_WRITES is not set
CONFIG_RTC=y
# CONFIG_TPM is not set
# CONFIG_MAINBOARD_HAS_TPM_CR50 is not set
CONFIG_STACK_SIZE=0x1000

#
# Console
#
CONFIG_SQUELCH_EARLY_SMP=y
# CONFIG_SPKMODEM is not set
# CONFIG_CONSOLE_NE2K is not set
CONFIG_CONSOLE_CBMEM_BUFFER_SIZE=0x20000
# CONFIG_CONSOLE_CBMEM_DUMP_TO_UART is not set
CONFIG_DEFAULT_CONSOLE_LOGLEVEL_8=y
# CONFIG_DEFAULT_CONSOLE_LOGLEVEL_7 is not set
# CONFIG_DEFAULT_CONSOLE_LOGLEVEL_6 is not set
# CONFIG_DEFAULT_CONSOLE_LOGLEVEL_5 is not set
# CONFIG_DEFAULT_CONSOLE_LOGLEVEL_4 is not set
# CONFIG_DEFAULT_CONSOLE_LOGLEVEL_3 is not set
# CONFIG_DEFAULT_CONSOLE_LOGLEVEL_2 is not set
# CONFIG_DEFAULT_CONSOLE_LOGLEVEL_1 is not set
# CONFIG_DEFAULT_CONSOLE_LOGLEVEL_0 is not set
# CONFIG_CMOS_POST is not set
# CONFIG_CONSOLE_POST is not set
CONFIG_POST_DEVICE_NONE=y
# CONFIG_POST_DEVICE_LPC is not set
# CONFIG_POST_DEVICE_PCI_PCIE is not set
CONFIG_POST_IO_PORT=0x80
# CONFIG_NO_EARLY_BOOTBLOCK_POSTCODES is not set
CONFIG_HWBASE_DEBUG_CB=y
CONFIG_HAVE_ACPI_RESUME=y
# CONFIG_ACPI_HUGE_LOWMEM_BACKUP is not set
CONFIG_RESUME_PATH_SAME_AS_BOOT=y
CONFIG_HAVE_HARD_RESET=y
# CONFIG_HAVE_ROMSTAGE_CONSOLE_SPINLOCK is not set
# CONFIG_HAVE_ROMSTAGE_NVRAM_CBFS_SPINLOCK is not set
# CONFIG_HAVE_ROMSTAGE_MICROCODE_CBFS_SPINLOCK is not set
CONFIG_HAVE_MONOTONIC_TIMER=y
# CONFIG_GENERIC_UDELAY is not set
# CONFIG_TIMER_QUEUE is not set
CONFIG_HAVE_OPTION_TABLE=y
# CONFIG_PIRQ_ROUTE is not set
CONFIG_HAVE_SMI_HANDLER=y
# CONFIG_PCI_IO_CFG_EXT is not set
CONFIG_IOAPIC=y
CONFIG_USE_WATCHDOG_ON_BOOT=y
CONFIG_VGA=y
# CONFIG_GFXUMA is not set
CONFIG_HAVE_ACPI_TABLES=y
CONFIG_COMMON_FADT=y
# CONFIG_ACPI_NHLT is not set

#
# System tables
#
# CONFIG_GENERATE_MP_TABLE is not set
# CONFIG_GENERATE_PIRQ_TABLE is not set
CONFIG_GENERATE_SMBIOS_TABLES=y

#
# Payload
#
# CONFIG_PAYLOAD_NONE is not set
# CONFIG_PAYLOAD_ELF is not set
# CONFIG_PAYLOAD_BAYOU is not set
# CONFIG_PAYLOAD_FILO is not set
# CONFIG_PAYLOAD_GRUB2 is not set
CONFIG_PAYLOAD_SEABIOS=y
# CONFIG_PAYLOAD_UBOOT is not set
# CONFIG_PAYLOAD_LINUX is not set
# CONFIG_PAYLOAD_TIANOCORE is not set
CONFIG_PAYLOAD_FILE="payloads/external/SeaBIOS/seabios/out/bios.bin.elf"
# CONFIG_SEABIOS_STABLE is not set
CONFIG_SEABIOS_MASTER=y
# CONFIG_SEABIOS_REVISION is not set
# CONFIG_SEABIOS_THREAD_OPTIONROMS is not set
CONFIG_SEABIOS_BOOTORDER_FILE=""
CONFIG_SEABIOS_DEBUG_LEVEL=-1

#
# Using default SeaBIOS log level
#
CONFIG_PAYLOAD_OPTIONS=""
# CONFIG_PXE is not set
CONFIG_COMPRESSED_PAYLOAD_LZMA=y
# CONFIG_PAYLOAD_IS_FLAT_BINARY is not set

#
# Secondary Payloads
#
# CONFIG_COREINFO_SECONDARY_PAYLOAD is not set
# CONFIG_MEMTEST_SECONDARY_PAYLOAD is not set
CONFIG_NVRAMCUI_SECONDARY_PAYLOAD=y
# CONFIG_TINT_SECONDARY_PAYLOAD is not set

#
# Debugging
#
# CONFIG_FATAL_ASSERTS is not set
# CONFIG_DEBUG_CBFS is not set
CONFIG_HAVE_DEBUG_RAM_SETUP=y
# CONFIG_DEBUG_RAM_SETUP is not set
# CONFIG_HAVE_DEBUG_CAR is not set
# CONFIG_HAVE_DEBUG_SMBUS is not set
# CONFIG_DEBUG_SMI is not set
# CONFIG_DEBUG_SMM_RELOCATION is not set
# CONFIG_DEBUG_MALLOC is not set
# CONFIG_DEBUG_ACPI is not set
# CONFIG_DEBUG_SPI_FLASH is not set
# CONFIG_TRACE is not set
# CONFIG_DEBUG_BOOT_STATE is not set
# CONFIG_DEBUG_ADA_CODE is not set
# CONFIG_ENABLE_APIC_EXT_ID is not set
CONFIG_WARNINGS_ARE_ERRORS=y
# CONFIG_POWER_BUTTON_DEFAULT_ENABLE is not set
# CONFIG_POWER_BUTTON_DEFAULT_DISABLE is not set
# CONFIG_POWER_BUTTON_FORCE_ENABLE is not set
# CONFIG_POWER_BUTTON_FORCE_DISABLE is not set
# CONFIG_POWER_BUTTON_IS_OPTIONAL is not set
# CONFIG_REG_SCRIPT is not set
# CONFIG_CREATE_BOARD_CHECKLIST is not set
# CONFIG_MAKE_CHECKLIST_PUBLIC is not set
# CONFIG_RAMSTAGE_ADA is not set
# CONFIG_RAMSTAGE_LIBHWBASE is not set
CONFIG_HWBASE_DYNAMIC_MMIO=y
# CONFIG_NO_XIP_EARLY_STAGES is not set
CONFIG_EARLY_CBMEM_INIT=y
# CONFIG_EARLY_CBMEM_LIST is not set
CONFIG_RELOCATABLE_MODULES=y
# CONFIG_BOARD_ID_AUTO is not set
# CONFIG_BOARD_ID_MANUAL is not set
CONFIG_BOOTBLOCK_CUSTOM=y

Build coreboot rom using make. 

make

The coreboot rom is saved to ./build/coreboot.rom.

Flashing Coreboot

First we need to split the coreboot.rom file. Remember, you only need to flash coreboot to the 4M MX25L3273E (left) flash chip. Since you have to write only top 4M, split the file with dd: 

dd of=./x1_carbon_MX25L3273E_coreboot.rom bs=1M if=./build/coreboot.rom skip=8

Connect your SOIC clip to the MX25L3273E flash chip (the left one). Insert the CH341A flash programmer into a USB port. Flash the 4M coreboot rom: 

flashrom -p ch341a_spi -c MX25L3273E -w ./x1_carbon_MX25L3273E_coreboot.rom

Congrats! You can now boot your X1 Carbon from coreboot!

If you're successful you will be greeted by SeaBIOS (or your preferred payload).

Internal Flashing

Please see Intel_Sandybridge_Build_Tutorial#Flashing_coreboot.

Unlock and Re-Flash MX25L6406E

Unlocking the 8M MX25L6406E flash image enables you to use flashrom internally without resorting to the SOIC clip and external flash programmer.

Build ifdtool. 

cd ./coreboot/util/ifdtool
make

Use ifdtool to unlock the 8M bios image. Your paths may be slightly different. 

./ifdtool -u ../x1c_MX25L6406E_original_bios.bin ../x1c_MX25L6406E_original_bios_unlocked.bin

Flash the unlocked 8M image back to the MX25L6406E. 

sudo flashrom -p ch341a_spi -c "MX25L6406E/MX25L6408E" -w x1c_MX25L6406E_original_bios_unlocked.bin

Get X1 Carbon Flash Layout

Extract the flash layout using ifdtool on the 8M MX25L6406E backup image. 

./util/ifdtool/ifdtool -f ./x1c.layout ./x1_carbon_MX25L6406E_original_bios.bin

It creates a layout file with the following contents: 

00000000:00000fff fd
00500000:007fffff bios
00003000:004fffff me
00001000:00002fff gbe

Flashing Coreboot Internally

Use the layout file to flash only the BIOS flash region, leaving IFD, ME, and GBE alone. Use the full 12M coreboot.rom image. 

flashrom -p internal:laptop=force_I_want_a_brick -l ./x1c.layout -i bios -w ./build/coreboot.rom

If you are receiving errors during flashing you most likely need to pass iomem=relaxed as a kernel parameter at boot time before using flashrom.

Successful flash output: 

flashrom v0.9.9-rc1-r1942 on Linux 4.8.0-52-generic (x86_64)
flashrom is free software, get the source code at https://flashrom.org

Using region: "bios".
Calibrating delay loop... OK.
coreboot table found at 0xbff5e000.
========================================================================
WARNING! You seem to be running flashrom on an unsupported laptop.
Laptops, notebooks and netbooks are difficult to support and we
recommend to use the vendor flashing utility. The embedded controller
(EC) in these machines often interacts badly with flashing.
See the manpage and https://flashrom.org/Laptops for details.

If flash is shared with the EC, erase is guaranteed to brick your laptop
and write may brick your laptop.
Read and probe may irritate your EC and cause fan failure, backlight
failure and sudden poweroff.
You have been warned.
========================================================================
Proceeding anyway because user forced us to.
Found chipset "Intel QS77".
This chipset is marked as untested. If you are using an up-to-date version
of flashrom *and* were (not) able to successfully update your firmware with it,
then please email a report to flashrom@flashrom.org including a verbose (-V) log.
Thank you!
Enabling flash write... Enabling hardware sequencing due to multiple flash chips detected.
OK.
Found Programmer flash chip "Opaque flash chip" (12288 kB, Programmer-specific) mapped at physical address 0x0000000000000000.
Reading old flash chip contents... done.
Erasing and writing flash chip... Erase/write done.
Verifying flash... VERIFIED.
Retrieved from "https://www.coreboot.org/index.php?title=Board:lenovo/x1_carbon_gen1&oldid=29056"