I have Jade2 on DM500. NFS over UDP works well:
mount -t nfs -o rsize=8192,wsize=8192,rw,soft,intr,udp,nolock 192.168.1.1:/tmp/harddisk /media/hdd
But mounting NFS over TCP fails:
root@(none) ~ # mount -t nfs -o rsize=8192,wsize=8192,rw,soft,intr,tcp,nolock 192.168.1.1:/tmp/harddisk /media/hdd
mount: Mounting 192.168.1.1:/tmp/harddisk on /media/hdd failed: Input/output error