How to start Linux kernel under ARM through NFS

How to Use NFS to start the Linux kernel under ARM-general Linux technology-Linux technology and application information. The following is a detailed description. I am using the ARM9--S3C2410 Development Board, VIVI and kernel have been downloaded successfully, and now using NFS to start the kernel is not successful. The following message indicates that the kernel cannot be started after an error occurs.

I have been home for several days, but I have never been able to figure it out. I 'd like to ask you a bit and give me a thought. Now I have no clue. Haha

IP-Config: Complete:

Device = eth0, addr = 192.168.1.100, mask = 255.255.255.0, gw = 192.168.1.17,

Host = www, domain =, nis-domain = realembed.com,

Bootserver = 192.168.1.17, rootserver = 192.168.1.17, rootpath =

NET4: Unix domain sockets 1.0/SMP for Linux NET4.0.

NetWinder Floating Point Emulator V0.95 (c) 1998-1999 Rebel.com

Looking up port of RPC 100003/2 on 192.168.1.17

Portmap: server 192.168.1.17 not responding, timed out

Root-NFS: Unable to get nfsd port number from server, using default

Looking up port of RPC 100005/1 on 192.168.1.17

Portmap: server 192.168.1.17 not responding, timed out

Root-NFS: Unable to get mountd port number from server, using default

Mount: server 192.168.1.17 not responding, timed out

Root-NFS: Server returned error-5 while mounting/root_nfs

VFS: Unable to mount root fs via NFS, trying floppy.

Request_module [block-major-2]: Root fs not mounted

VFS: Cannot open root device "nfs" or 0: 00

Please append a correct "root =" boot option

Kernel panic: VFS: Unable to mount root fs on