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Building (the repo way)

This will help you on building kernels (12 or older)

Guide​

Cloning the needed manifest​

MSM kernels (Qualcomm)​

Clone the manifest, replace manifest.xml with actual one (e.g. AU_LINUX_KERNEL.PLATFORM.1.0.R1.00.00.00.000.189.xml), you can find the one you need by searching on Telegram with the board you base on (e.g. taro would use the manifest file above).

repo init -u https://git.codelinaro.org/clo/la/kernelplatform/manifest/ -b release -m <manifest.xml> --depth 1

AOSP​

Follow this guide for reference: https://source.android.com/docs/setup/build/building-kernels

Clone the manifest, replace <branch> with actual one (e.g. common-android12-5.10), you can find the one you need by searching https://android.googlesource.com/kernel/manifest/+refs

repo init -u https://android.googlesource.com/kernel/manifest -b <branch> --depth 1

Sync the sources​

repo sync -c -j$(nproc --all) --no-clone-bundle --no-tags

(Optional) Set optimized build environment variables​

export CC="ccache clang"
export LTO=thin

Build the kernel itself​

Replace BUILD_CONFIG value with the config you want to use but generally we'll be building for GKI platform

export BUILD_CONFIG=common/build.config.gki.aarch64
./build/build.sh

This will build a GKI kernel.