3. Compile Source

❶ Unzip the source.

1tar xvf ROCKCHIP_ANDROID12.0_SDK_RELEASE.tar.gz
2cd ROCKCHIP_ANDROID12.0_SDK_RELEASE

❷ Compile uboot.

1cd u-boot
2./make.sh rk3568

❸ Compile kernel.

1cd kernel-4.19/
2make ARCH=arm64 rockchip_defconfig android-11.config
3make ARCH=arm64 rk3568-evb2-lp4x-v10.img -j24

kernel.img and resource.img are included in boot.img.

If only update kernel, complie as follow. After compiling, user can directly flash the boot.img under kernel directory.

1make ARCH=arm64 rockchip_defconfig android-11.config
2make ARCH=arm64 BOOT_IMG=../rockdev/Image-rk3568_s/boot.img rk3568-evb2-lp4x-v10.img -j24

❹ Compile Android.

1source build/envsetup.sh
2lunch rk3568_r-userdebug
3make -j12

❺ Generated image file.

1./mkimage.sh
2./build.sh -u     //package update.img
3cd rockdev
4ls

Images and update.img are generated in current directory.