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TFTP boot and NFS root file system

I am very tired of finding out the problem!!!

I got tftp boot my at91rm9200dk board with following kernel command line
Kernel command line: mem=16M root=/dev/nfs nfsroot=192.168.3.151:/home/nlksg/development/rootfs ip=192.168.3.177:192.168.3.151:192.168.3.1:255.255.255.0::eth0:

My /etc/exports set to
/home/nlksg/development/rootfs 192.168.3.177(rw,no_root_squash) 192.168.3.100(rw,no_root_squash)
/home/nlksg/development 192.168.3.100(rw,no_root_squash) 192.168.3.177(rw,no_root_squash)
What more!!! I got following boot msg.
VFS: Mounted root (nfs filesystem) readonly.
Freeing init memory: 92K
INIT: version 2.74 booting
can't create lock file /etc/mtab~~: Read-only file system (use -n flag to override)
I can't understand! This dam thing still not working! I have to do reading and hunting forum post tonight about this issue!

I hope to solve it by tomorrow!!

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