参考文档

https://www.raspberrypi.org/documentation/linux/kernel/building.md

代码下载

git clone https://github.com/raspberrypi/linux

64bit image下载

https://downloads.raspberrypi.org/raspios_lite_arm64/images/raspios_lite_arm64-2020-08-24/

代码用树莓派自己的，别用ubuntu的，没搞明白代码怎么下载
---------------------- I am splitter ----------------------------

两种方法，一是apt命令，二是ubuntu官网的release

apt 命令

apt-cache search linux-source

jimmy@jimmy-desktop:/usr/local/src$ apt-cache search linux-source
linux-source - Linux kernel source with Ubuntu patches
linux-source-5.8.0 - Linux kernel source for version 5.8.0 with Ubuntu patches
linux-source-5.7.0 - Linux kernel source for version 5.7.0 with Ubuntu patches

sudo apt-get install linux-source-5.8.0

cd /usr/src

release

http://cdimage.ubuntu.com/releases/20.10/release/source/