IMX6ULL - Linux根文件系统(rootfs)构建

Author: zzssdd2

E-mail: [email protected]

一、Ubuntu-base20.04.3

Ubuntu官方已经制作好了各架构、各版本的base版根文件系统，只需下载下来做少许改动即可。

1. 下载Ubuntu Base 20.04.3 LTS (Focal Fossa)

   ubuntu-base-20.04.3-base-armhf.tar.gz	2021-08-19 10:56	22M
   

2. 解压

   mkdir rootfs
   sudo chmod 777 rootfs
   tar -zxvf ubuntu-base-20.04.3-base-armhf.tar.gz -C rootfs
   #避免后面更新软件报错
   sudo chmod 777 ./rootfs/tmp/
   

3. 安装工具

   sudo apt-get install qemu-user-static
   sudo cp /usr/bin/qemu-arm-static ./rootfs/usr/bin/
   

4. 拷贝主机DNS

   sudo cp /etc/resolv.conf ./rootfs/etc/resolv.conf
   

5. 更换下载源

   cp ./rootfs/etc/apt/source.list ./rootfs/etc/apt/source.list.bak
   vim ./rootfs/etc/apt/source.list
   `Esc` + `:`
   %s/ports.ubuntu.com/mirror.tuna.tsinghua.edu.cn/g
   `Enter`
   

6. 创建挂载脚本vim mount.sh

   内容如下：

   #!/bin/bash
   mnt() {
        
   	echo "MOUNTING"
   	sudo mount -t proc /proc ${2}proc
   	sudo mount -t sysfs /sys ${2}sys
   	sudo mount -o bind /dev ${2}dev
   	sudo mount -o bind /dev/pts ${2}dev/pts
   	sudo chroot ${2}
   }
   umnt() {
        
   	echo "UNMOUNTING"
   	sudo umount ${2}proc
   	sudo umount ${2}sys
   	sudo umount ${2}dev/pts
   	sudo umount ${2}dev
   }
   
   if [ "$1" == "-m" ] && [ -n "$2" ] ;
   then
   	mnt $1 $2
   elif [ "$1" == "-u" ] && [ -n "$2" ];
   then
   	umnt $1 $2
   else
   	echo ""
   	echo "Either 1'st, 2'nd or both parameters were missing"
   	echo ""
   	echo "1'st para