OK6410 NFS挂不上 实在崩溃

好几天了，搞了好几遍，NFS还是挂不上，都快骂娘了，谁给看看，十分感谢
宿主机IP：192.168.0.2
虚拟机内IP：192.168.0.231
宿主机ping192.168.0.231ping的通，重启板子，还是连不上，以下是显示信息：
IP-Config: Complete:
     device=eth0, addr=192.168.0.232, mask=255.255.255.0, gw=192.168.0.201,
     host=witech, domain=, nis-domain=com.cn,
     bootserver=192.168.0.231, rootserver=192.168.0.231, rootpath=
Looking up port of RPC 100003/2 on 192.168.0.231
hub 1-0:1.0: connect-debounce failed, port 2 disabled
hub 1-0:1.0: connect-debounce failed, port 2 disabled
hub 1-0:1.0: connect-debounce failed, port 2 disabled
hub 1-0:1.0: connect-debounce failed, port 2 disabled
hub 1-0:1.0: connect-debounce failed, port 2 disabled
hub 1-0:1.0: connect-debounce failed, port 2 disabled
hub 1-0:1.0: connect-debounce failed, port 2 disabled
hub 1-0:1.0: connect-debounce failed, port 2 disabled
hub 1-0:1.0: connect-debounce failed, port 2 disabled
usb 1-2: new full speed USB device using s3c2410-ohci and address 2
usb 1-2: device descriptor read/64, error -62
usb 1-2: device descriptor read/64, error -62
usb 1-2: new full speed USB device using s3c2410-ohci and address 3
usb 1-2: device descriptor read/64, error -62
usb 1-2: device descriptor read/64, error -62
usb 1-2: new full speed USB device using s3c2410-ohci and address 4
usb 1-2: device not accepting address 4, error -62
usb 1-2: new full speed USB device using s3c2410-ohci and address 5
usb 1-2: device not accepting address 5, error -62
hub 1-0:1.0: unable to enumerate USB device on port 2
rpcbind: server 192.168.0.231 not responding, timed out
Root-NFS: Unable to get nfsd port number from server, using default
Looking up port of RPC 100005/1 on 192.168.0.231
rpcbind: server 192.168.0.231 not responding, timed out
Root-NFS: Unable to get mountd port number from server, using default
Root-NFS: Server returned error -5 while mounting /dahai/root
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            3840 mtdblock1 (driver?)
1f02           81920 mtdblock2 (driver?)
1f03          962560 mtdblock3 (driver?)
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(2,0)

ubuntu的nfs也启动了

uboot pri看一下～
发上来～

NFS挂载需要注意的事项  已经多次在论坛中讨论
LZ和LS这次可以体验一下论坛的搜索功能

uboot你设置的参数，贴出来吧～