Kernel for Raspberry Pi 3 to boot Android 9 Pie

Setup build environment

Assuming you already downloaded Android 9 Pie source code and the device configuration files from https://github.com/brobwind/pie-device-brobwind-rpi3.

And already built the whole project.

Download source code

Download the source code from https://github.com/brobwind/pie-device-brobwind-rpi3-kernel-v4.14

$ git clone -b pie-device-brobwind-rpi3 https://github.com/brobwind/pie-device-brobwind-rpi3-kernel-v4.14 kernel-v4.14

Build

Assuming current path is kernel-v4.14, execute following commands will build a 64-bit kernel.

1. Run configuration

$ export INSTALL_ROOT=`pwd`/../device/brobwind/rpi3/boot/kernel-v4.14
$ export CROSS_COMPILE=`pwd`/../prebuilts/gcc/linux-x86/aarch64/aarch64-linux-android-4.9/bin/aarch64-linux-androidkernel-
$ INSTALL_PATH=${INSTALL_ROOT} INSTALL_MOD_PATH=${INSTALL_ROOT} ARCH=arm64 make bcmrpi3_defconfig

2. Build kernel image

$ INSTALL_PATH=${INSTALL_ROOT} INSTALL_MOD_PATH=${INSTALL_ROOT} ARCH=arm64 make -j 4

3. Build dtbs

$ INSTALL_PATH=${INSTALL_ROOT} INSTALL_MOD_PATH=${INSTALL_ROOT} ARCH=arm64 make -j 4 dtbs

Install target

The kernel image and the dtbs will be installed in device/brobwind/rpi3/boot/kernel-v4.14 after executing follow commands:

$ INSTALL_PATH=${INSTALL_ROOT} INSTALL_MOD_PATH=${INSTALL_ROOT} ARCH=arm64 make dtbs_install
$ INSTALL_PATH=${INSTALL_ROOT} INSTALL_MOD_PATH=${INSTALL_ROOT} ARCH=arm64 make install

NOTE: Install dtbs before kernel