求助：在开发板和LINUX间用NFS挂载文件看不到？

自行goolge解决了，http://ubuntuforums.org/showthread.php?t=2198333
“ SOLVED! There is some incompatibility between the very old NFS client version and the new server version. Specifying 'nfsvers=2' on the client (in the mount options) solves the problem. ”
客户端和PC端版本不兼容问题，

man 5 nfs 查看了下nfsvers=n 的说明如下：
nfsvers=n The NFS protocol version number used to
contact the server's NFS service. If the
server does not support the requested ver‐
sion, the mount request fails. If this
option is not specified, the client negoti‐
ates a suitable version with the server,
trying version 4 first, version 3 second,
and version 2 last.
试到nfsvers=3 OK。