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       [[rockpi4 | ROCK Pi 4]] > [[rockpi4/dev | Development]] > [[rockpi4/dev/compile-a-kernel-module-on-rockpi4 | Compile a kernel module on ROCK Pi 4]]

=== Description ===

This guide is for  compiling a kernel module for ROCK Pi 4 on ROCK Pi 4 board. You can use system images [https://dl.radxa.com/rockpi4/images/debian/ Debian] and [https://dl.radxa.com/rockpi4/images/ubuntu/ Ubuntu].

=== Software Support ===

For kernel, you need to upgrade to at least '''4.4.154-98-rockchip''' version.

Note that the latest U-boot and Kernel packages are in '''Radxa APT''' '''stretch-testing''' and '''bionic-testing''' repositories.

Also, you need to update rockchip-fstab, rockchip-overlay, u-boot packages. And [[rockpi4/radxa-apt | Radxa APT]] helps.

=== Example: r8152 device driver===

Here take r8152 device driver as an example.

Install necessary packages.

  $ sudo apt-get install -y libssl-dev build-essential

Recompile dependent libraries.

  $ cd /usr/src/linux-headers-$(uname -r)
  $ make scripts

Download [https://github.com/wget/realtek-r8152-linux/archive/master.zip r8152 driver source code] to ROCK Pi 4 and extract it to home directory.

Go to the top-level directory of the source code

  $ cd realtek-r8152-linux-master
  $ ls
  50-usb-realtek-net.rules  compatibility.h  Makefile  r8152.c  ReadMe.txt

Generate r8152.ko file.

  $ make

Check kernel release and processor
  $ uname -rp
  4.4.154-98-rockchip-gcbc3da2ca32c aarch64

Check r8152 ko information

  $ modinfo r8152.ko 
  filename:       /home/rock/r8152_2.12.0/r8152.ko
  version:        v2.12.0 (2019/04/29)
  license:        GPL
  description:    Realtek RTL8152/RTL8153 Based USB Ethernet Adapters
  author:         Realtek nic sw <nic_swsd@realtek.com>
  srcversion:     576F778ECF92A5E23120A75
  ...
  depends:        
  vermagic:       4.4.154-98-rockchip-gcbc3da2ca32c SMP mod_unload aarch64

The vermagic of module should be the same as current kernel release version like 4.4.154-98-rockchip-gcbc3da2ca32c.

Install driver module to kernel.

  $ sudo make install

Remove driver module.

  $ sudo rmmod r8152

=== FAQs ===


=== Troubleshooting ===

If you have issue with compiling a kernel module on ROCK Pi 4, start a new post on the forum. https://forum.radxa.com/c/dev