挂载nfs文件系统出现问题，求救啊

做挂载网络文件系统时出现这个问题，完全按照手册上讲的来搞得
TCP cubic registered
RPC: Registered udp transport module.
RPC: Registered tcp transport module.
lib80211: common routines for IEEE802.11 drivers
s3c2410-rtc s3c2410-rtc: setting system clock to 2010-01-18 15:23:32 UTC (126382
8212)
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 0xCDE1
Looking up port of RPC 100005/1 on 192.168.1.10

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            2048 mtdblock1 (driver?)
1f02          257536 mtdblock2 (driver?)
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(2,0)
Backtrace:
[<c0039fd4>] (dump_backtrace+0x0/0x10c) from [<c02b14b8>] (dump_stack+0x18/0x1c)

r7:c380a0cb r6:c03bdee0 r5:c380a000 r4:c381df40
[<c02b14a0>] (dump_stack+0x0/0x1c) from [<c02b1508>] (panic+0x4c/0x124)
[<c02b14bc>] (panic+0x0/0x124) from [<c0008e30>] (mount_block_root+0x178/0x234)
r3:00000000 r2:c38553ec r1:c381df40 r0:c033f258
[<c0008cb8>] (mount_block_root+0x0/0x234) from [<c0008f9c>] (mount_root+0xb0/0xf
4)
[<c0008eec>] (mount_root+0x0/0xf4) from [<c00090d8>] (prepare_namespace+0xf8/0x1
8c)
r7:c03bd8c4 r6:c001e83c r5:c001e83c r4:c001e84c
[<c0008fe0>] (prepare_namespace+0x0/0x18c) from [<c0008478>] (kernel_init+0xc8/0
xf4)
r7:00000000 r6:c001da14 r5:c001d6b0 r4:c001da14
[<c00083b0>] (kernel_init+0x0/0xf4) from [<c004af30>] (do_exit+0x0/0x620)
r7:00000000 r6:00000000 r5:00000000 r4:00000000
死在这里了，请问贵公司是什么问题啊？

1、PC端的NFS是否设置OK？
2、开发板从yaffs启动后能否挂载NFS？

谢谢，PC的NFS我已经设置好了，使用mount -t nfs 192.168.1.10:/opt/EmbedSky/root_nfs /opt/EmbedSky/root命令是可以顺利挂载的。
    连接了开发板后，我用开发板ping主机地址 192.168.1.10也是有正常返回的，主机端ping开发板地址 192.168.1.6也是可以的，但用yaffs启动后用mount -t nfs 192.168.1.10:/opt/EmbedSky/root_nfs /mnt -o nolock就显示mount: RPC time out超时错误，不知道是什么问题了，请问是什么问题呢？

PC自己挂自己后，在/opt/EmbedSky/root下的内容和/opt/EmbedSky/root_nfs下的一样吗？

挂载后内容是一样的，后来做了WEB服务器实验，在浏览器里面控制板子的LED,是可以的，板子是没有问题的，应该是我的Red hat系统的问题，感谢天嵌 工程师的热心支持。