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DM6446 boot problem with NFS

I am not able to boot my device DM6446 with NFS. I am getting following errors on minicom.

IP-Config: Complete:
      device=eth0, addr=192.168.1.180, mask=255.255.255.0, gw=192.168.1.1,
     host=192.168.1.180, domain=, nis-domain=(none),
     bootserver=192.168.1.157, rootserver=192.168.1.157, rootpath=
Looking up port of RPC 100003/3 on 192.168.1.157
Root-NFS: Unable to get nfsd port number from server, using default
Looking up port of RPC 100005/3 on 192.168.1.157
Root-NFS: Unable to get mountd port number from server, using default
Root-NFS: Server returned error -5 while mounting /home/rahul/aragotest
VFS: Unable to mount root fs via NFS, trying floppy.
VFS: Cannot open root device "nfs" or unknown-block(2,0)
Please append a correct "root=" boot option
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(2,0)

My bootargs are:-

bootargs mem=90M eth0=00:45:c3:72:a5:4f console=ttyS0,115200n8 ip=192.168.1.180:192.168.1.157:192.168.1.1:255.255.255.0:::off rw root=/dev/nfs nfsroot=192.168.1.157:/home/rahul/aragotest,v3,tcp,rsize=32768,wsize=32768