Created
October 8, 2025 02:51
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Cros EC Zephyr Build
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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` |
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