reboots on NFS

alexfreed
I guess there is more than one MINI2440. This is what I have

http://armdesigner.com/MINI2440.html

It works fine with the bundled kernel 2.6.30 if the root is on NAND, but if
I try to set root on NFS server it mounts the NFS filesystem and executes
init, etc. but always reboots after about 15 seconds. Very consistent, like
a watchdog timer expiring.

Any ideas?

Thanks.