Disable write protection by following the Chromium OS wiki
flashrom --wp-disable Check out corebootgit clone http://review.coreboot.org/p/coreboot cd coreboot Extract BIOS from running systemThe BIOS from the running system will contain some specific data in GBB and VPD regions that are unique. It is recommended to extract and save this BIOS in case you want to restore to previous unique device information. Without a valid HWID the system will be unable to recover or receive updates. flashrom -r device_bios.bin Extract BIOS from Firmware Update utility on the deviceThe BIOS extracted from a running system does not contain the Management Engine firmware as that region is not readable from the host. The firmware update utility contains a raw BIOS update image which will contain the Management Engine binary. Copy /usr/sbin/chromeos-firwmwareupdate from device, execute, and copy bios.bin to coreboot root. chromeos-firwmareupdate --sb_extract /tmp cp /tmp/bios.bin . Extract SPI Descriptor and Management Engine binaryifdtool -x bios.bin Extract MRC binarycbfstool bios.bin extract -n mrc.bin -f mrc.bin Extract VBIOS binarySave as PCI Device ID 0x0a06 to make SeaBIOS happycbfstool bios.bin extract -n pci8086,0406.rom -f pci8086,0a06.rom Configure Corebootmake menuconfig Suggested Settings> Mainboard -> Mainboard Vendor -> Google > Mainboard -> Mainboard Model -> Falco > Chipset -> Add a System Agent binary -> mrc.bin > VGA BIOS -> Add a VGA BIOS image -> pci8086,0a06.rom > VGA BIOS -> VGA device PCI IDs -> 8086,0a06 > Console -> Serial port console output -> DISABLE > Payload -> Add a payload -> SeaBIOS > Payload -> SeaBIOS version -> master > ChromeOS -> Build for ChromeOS -> DISABLE Build Coreboot and SeaBIOSmake Configure SeaBIOS to use ESC key instead of F12echo -ne "\x01" > boot-menu-key echo -e "\nPress ESC for boot menu.\n" > boot-menu-message cbfstool build/coreboot.rom add -f boot-menu-key -n etc/boot-menu-key -t raw cbfstool build/coreboot.rom add -f boot-menu-message -n etc/boot-menu-message -t raw If setting a boot splash screen: cbfstool build/coreboot.rom add -f bootsplash.jpg -n bootsplash.jpg -t raw Add SPI Descriptordd if=flashregion_0_flashdescriptor.bin of=build/coreboot.rom conv=notrunc Add Management Engineifdtool -i me:flashregion_2_intel_me.bin build/coreboot.rom mv build/coreboot.rom.new build/coreboot.rom |