说明：  当你重新编译了EM85XX的交叉编译工具以支持SUNRPC时，你发现你的内核和应用程序还是无法访问局域网中的NFS，FTP，此时你应该还要一个工具，它的名字叫PORTMAP,这个工具用来映射端口的。
(When you recompiled EM85XX cross-compiler tools to support SUNRPC, you find that you have the kernel and applications are still unable to access LAN NFS, FTP, at this time you should also a tool, its name is PORTMAP, this tools used to map ports.)