How uConsole CM4 OS Image Is Made
This guide explains how to create an OS image for the uConsole CM4 module.
uConsole_CM4_v2.0_64bit.img.7z
Since v2.0, cm4 os image is made by pi-gen
just clone pi-gen repo, branch uconsole_arm64
run sudo ./build.sh in ubuntu linux PC
- kernel source:
9a1e3adc9d
here is kernel compiling commands:
export KERNEL=kernel8
export ARCH=arm64
export CROSS_COMPILE=aarch64-linux-gnu-
make bcm2711_defconfig
make -j4
mkdir -p ../modules
rm -rf ../modules/*
INSTALL_MOD_PATH=../modules make modules_install
mkdir -p ../firmware
rm -rf ../firmware/*
mkdir -p ../firmware/overlays
cp arch/arm64/boot/Image ../firmware/$KERNEL.img
cp arch/arm64/boot/dts/broadcom/*.dtb ../firmware
cp arch/arm64/boot/dts/overlays/*.dtb* ../firmware/overlays/
cp arch/arm64/boot/dts/overlays/README ../firmware/overlays/
KERNEL_VER=$(make kernelrelease)
cp arch/arm64/boot/Image.gz ../vmlinuz-${KERNEL_VER}
cp System.map ../System.map-${KERNEL_VER}
cp .config ../config-${KERNEL_VER}
mkdir -p ../linux-headers-${KERNEL_VER}
make headers_install INSTALL_HDR_PATH=../linux-headers-${KERNEL_VER}
- In pi-gen , we added some modifcations:
- Pull up gpio9 at boot,so that screen will turn on right away when Power on
- Set default lcd backlight to 3
- Set default desktop to be large screen
- No wallpaper, only black color
- Fn+<> to adjust lcd backlight