用GNU 等免费工具开发ARM系统，英文系统，写于2007年，跟最新版本软件稍微有些出入，但是仔细对照后可以成功安装。-Using GNU tools such as free ARM systems, the English system, written in 2007 with the latest version of the software is slightly different from that slightly, but after careful control can be successfully installed.