设置挂载NFS文件系统后，，开发板不能启动，，怎么再设置回挂载yaffs文件系统启动

设置了NFS文件系统，，但是
eth0: link down
IP-Config: Complete:
     device=eth0, addr=192.168.1.6, mask=255.255.255.0, gw=192.168.1.6,
     host=SKY2440, domain=, nis-domain=embedsky.net,
     bootserver=192.168.1.10, rootserver=192.168.1.10, rootpath=
Looking up port of RPC 100003/2 on 192.168.1.10
eth0: link up, 100Mbps, full-duplex, lpa 0xC5E1
rpcbind: server 192.168.1.10 not responding, timed out
Root-NFS: Unable to get nfsd port number from server, using default
Looking up port of RPC 100005/1 on 192.168.1.10
rpcbind: server 192.168.1.10 not responding, timed out
Root-NFS: Unable to get mountd port number from server, using default
Root-NFS: Server returned error -5 while mounting /opt/EmbedSky/root_nfs
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; here are the available partitions:
1f00             256 mtdblock0 (driver?)
1f01            3072 mtdblock1 (driver?)
1f02          257024 mtdblock2 (driver?)
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(2,0)
[<c0029ab4>] (unwind_backtrace+0x0/0xe8) from [<c02afc80>] (panic+0x44/0x124)
[<c02afc80>] (panic+0x44/0x124) from [<c0008fe0>] (mount_block_root+0x16c/0x224)

[<c0008fe0>] (mount_block_root+0x16c/0x224) from [<c0009284>] (prepare_namespace
+0x100/0x1bc)
[<c0009284>] (prepare_namespace+0x100/0x1bc) from [<c00085ac>] (kernel_init+0xc0
/0xec)
[<c00085ac>] (kernel_init+0xc0/0xec) from [<c0047ccc>] (do_exit+0x0/0x5fc)
[<c0047ccc>] (do_exit+0x0/0x5fc) from [<00000000>] (0x0)
不知道怎么回事，，，想设回原来的yaffs文件系统启动，，，怎么设置，
请教！！！！！！

1# wangpeihui123


命令 0 ，进入后选 2 ，就自然恢复你从nand 载入yaffs2文件系统