更新程序，对嵌入式linux，此程序能更新系统的内核和根文件系统，将此程序编译成cgi，通过boa服务器调用能方便地通过网页更新内核及根文件系统。-Update procedures, embedded linux, this procedure can update the system s kernel and root file system, this program is compiled into a cgi, server calls by boa can easily updat