Linux kernel on Orange Pi 4

Using Linux kernel on an Orange Pi 4.

This page is focused just on building a kernel. For the related required components, see Linux on Orange Pi 4.

Prerequisite: U-Boot on Orange Pi 4

Next steps: rootfs on Orange Pi 4

TODO: THIS!

Overview

In order to build a Linux kernel you'll need:

1. Linux kernel source
2. (optional) Patches to add support for the specific hardware
3. Cross-compilation toolchain if building on a different device than Orange Pi 4

Setup

Linux kernel

TODO: Git clone

Kernel patches

TODO: Switch to a Mainline Linux. Right now we're using a BSP Linux kernel which already supports Orange Pi 4.

Cross-compilation

This is needed only if you're building on a different architecture, e.g. on an x86_64 computer.

TODO: Linaro + instructions?

CROSS_COMPILE=/path/to/toolchain/bin/aarch64-linux-gnu-

Compiling

TODO: compilation

Generate .config file

cd linux
make ARCH=arm64 CROSS_COMPILE=$CROSS_COMPILE rk3399_linux_defconfig

Compile the kernel

CORES=4 # number of CPU cores
make ARCH=arm64 CROSS_COMPILE=$CROSS_COMPILE -j${CORES} rk3399-orangepi.img

You should see something like this at the end of the compilation:

Pack to resource.img successed!
  Image:  resource.img (with rk3399-orangepi.dtb logo.bmp logo_kernel.bmp) is ready
  Image:  boot.img (with Image resource.img) is ready
  Image:  zboot.img (with Image.lz4 resource.img) is ready

TODO: Customize boot logo.

TODO: Modules? Img to flash? boot.img

Flashing

TODO: Building an SD Card image file would be better

dd if=boot.img of=sdb seek=32768

Related

• BSP Linux on Orange Pi 4

External Links

• Mainline Linux kernel [1]
  • Github mirror [2]
• Rockchip Kernel [3]
• Xunlong BSP kernel [4]
  • instructions for older Orange Pis [5]
  • compilation script [6]
• Armbian kernel patches [7]