nfs mounting problem

Manjunath AM Manjunath.AM at
Tue Jan 23 23:33:28 EST 2007


We are using MPC8272 based target board, we are trying to mount montavista 
Linux version 2.6.10 kernel image (with NFS enabled) to our target board,
we are setting following bootargs in bootloader 

"setenv bootargs root=/dev/nfs 

when we boot the board, it is not able to mount nfs file system to board, 
but the same image and configuration works with MPC8272ADS board.
please suggest me, what could be the problem.

Booting image at 00200000 ...
   Image Name:   Linux-2.6.10_mvl401-8272ads
   Image Type:   PowerPC Linux Kernel Image (gzip compressed)
   Data Size:    948607 Bytes = 926.4 kB
   Load Address: 00000000
   Entry Point:  00000000
   Verifying Checksum ... OK
   Uncompressing Kernel Image ... OK
Linux version 2.6.10_mvl401-8272ads (root at em178110) (gcc version 3.4.3 
(MontaVista 3.4.3-
1961 2005-12-18)) #2 Tue Jan 23 16:54:50 IST 2007
Motorola PQ2 ADS PowerPC port
Built 1 zonelists
Kernel command line: root=/dev/nfs 
PID hash table entries: 128 (order: 7, 2048 bytes)
hr_time_init: arch_to_nsec = 83886080, nsec_to_arch = 107374182
Warning: real time clock seems stuck!
Dentry cache hash table entries: 4096 (order: 2, 16384 bytes)
Inode-cache hash table entries: 2048 (order: 1, 8192 bytes)
Memory: 13952k available (1684k kernel code, 468k data, 100k init, 0k 
Mount-cache hash table entries: 512 (order: 0, 4096 bytes)
desched cpu_callback 3/00000000
ksoftirqd started up.
desched cpu_callback 2/00000000
desched thread 0 started up.
NET: Registered protocol family 16
Installing knfsd (copyright (C) 1996 okir at
Initializing Cryptographic API
Serial: CPM driver $Revision: 0.01 $
ttyCPM0 at MMIO 0xf0011a00 (irq = 40) is a CPM UART
ttyCPM1 at MMIO 0xf0011a60 (irq = 43) is a CPM UART
io scheduler noop registered
io scheduler anticipatory registered
io scheduler deadline registered
io scheduler cfq registered
RAMDISK driver initialized: 16 RAM disks of 8192K size 1024 blocksize
loop: loaded (max 8 devices)
fs_enet.c:v1.0 (Aug 8, 2005)
Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2
ide: Assuming 50MHz system bus speed for PIO modes; override with 
eth0: FCC ENET Version 0.3, 00:99:23:c4:ad:de
eth1: FCC ENET Version 0.3, 00:99:23:44:ad:de
eth2: FCC ENET Version 0.3, 00:99:23:64:ad:de
NET: Registered protocol family 2
IP: routing cache hash table of 512 buckets, 4Kbytes
TCP: Hash tables configured (established 1024 bind 2048)
NET: Registered protocol family 1
NET: Registered protocol family 17
IP-Config: Complete:
      device=eth1, addr=, mask=, 
     host=cashel, domain=, nis-domain=(none),
     bootserver=, rootserver=, rootpath=
Looking up port of RPC 100003/2 on
portmap: server not responding, timed out
Root-NFS: Unable to get nfsd port number from server, using default
Looking up port of RPC 100005/1 on
portmap: server not responding, timed out
Root-NFS: Unable to get mountd port number from server, using default
mount: server not responding, timed out
Root-NFS: Server returned error -5 while mounting 
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 
 <0>Rebooting in 180 seconds..

Thanks and awaiting for your valuable feedback

Thanks & Regards
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