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WeirdTreeThing/instructions.txt

Created October 8, 2025 02:51
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    make a directory to store everything
    ```
    mkdir ~/cros-ec
    cd ~/cros-ec
    ```

    build coreboot's arm toolchain as google also uses that
    ```
    git clone https://review.coreboot.org/coreboot.git
    cd coreboot
    make crossgcc-arm CPUS=$(nproc)
    ```

    setup a python venv
    ```
    python3 -m venv venv
    source venv/bin/activate
    pip install pyyaml setuptools pykwalify pylibfdt packaging pyelftools colorama
    ```

    clone all the repos
    ```
    mkdir -p src/platform
    mkdir -p src/third_party/zephyr

    git clone https://chromium.googlesource.com/chromiumos/platform/ec src/platform/ec -b stabilize-15964.9.B-main
    git clone https://chromium.googlesource.com/chromiumos/third_party/zephyr src/third_party/zephyr/main -b stabilize-15964.9.B
    git clone https://chromium.googlesource.com/chromiumos/third_party/zephyr/cmsis src/third_party/zephyr/cmsis -b stabilize-15964.9.B
    git clone https://chromium.googlesource.com/chromiumos/overlays/chromiumos-overlay src/third_party/chromiumos-overlay -b stabilize-15964.9.B
    # create .repo to trick the build system into thinking this is a full chromeos checkout
    mkdir .repo
    ```

    install zmake
    ```
    cd src/platform/ec
    pip install -e zephyr/zmake
    ```

    build the ec image

    ```
    export CROS_WORKON_SRCROOT=~/cros-ec
    export COREBOOT_SDK_ROOT=~/cros-ec/coreboot/util/crossgcc/xgcc

    zmake -j$(nproc) build <board>
    ```

    output binary is `build/zephyr/<board>/output/ec.bin`