coreboot_glk

Hacky way to build functional Coreboot with Tianocore Payload for GeminiLake-based Chromebooks -- BOOT EFI OSes on Chromebook

USAGE: Works best [and very quickly] on Gitpod

Or, if you have to use your own system.

The startup.sh script does everything for you.

git clone https://github.com/jake5253/coreboot_glk && coreboot_glk/startup.sh

...OR: If you wish to do all the work yourself, follow these steps:

1. Install dependencies [debian,ubuntu,mint,etc.]:

build-essential gnat-10 flex bison libncurses5-dev wget zlib1g-dev sharutils e2fsprogs parted curl unzip ca-certificates

2. Clone Coreboot repo:

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

   cd coreboot_glk

   git submodule update --init --checkout

3. Build crossgcc:

make crossgcc-i386 CPUS=$(nproc)

YES. i386 IS correct -- its the only one that works NOTE: this step could take a while

4. Build cbfstool

cd util/cbfstool

make

sudo make install

5. Build ifdtool

cd ../ifdtool

make

sudo make install

6. Use my modified crosfirmware.sh script

cd ../../..

curl -O https://raw.githubusercontent.com/jake5253/coreboot_glk/main/crosfirmware.sh

chmod +x crosfirmware.sh

bash crosfirmware.sh octopus glk

Essentially, we download the full recovery image from Google, extract the root filesystem, copy out the firmware_update_tool, run firmware_update_tool locally -- in unpack-only mode, use cbfstool and ifdtool to extract the blobs we need from the firmware files, drop the blobs into coreboot, and finally tell coreboot where to find the files

7. Build Coreboot

curl -O https://raw.githubusercontent.com/jake5253/coreboot_glk/main/build.sh

chmod +x build.sh

bash build.sh