1.mkdir project
2.cd project
3.git clone https://gitlab.com/buildroot.org/buildroot.git
5.cd buildroot
6.make raspberrypi4_defconfig
7.Target option --->
Target Architecture (ARM (little endian)) --->
Target Architecture Variant (cortex-A72) --->
Target Binary Format (ELF) --->
8.Toolchain --->
\* Copy gdb server to target
9.System configuration --->
Root password (123456) 登录密码设置为123456
10.Kernel --->
\* Linux Kernel
Kernel version (Custom tarball)
11.Target Package --->
\* Show packages that are also provided by BusyBox
Networking applications --->
\* openssh
12.查看可用CPU核心数；
13.编译；
14.生成固件sdcard.img;
问题：ssh无法登录
1.vi /etc/network/interfaces
2.vi /etc/ssh/sshd_config
以上文件修改完之后保存再重启；
可以看到ssh打开成功。
