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              小弟正在移植Linux-2.6.26至达芬奇平台。编译后运行内核，采用NFS网络文件系统模式。内核运行时出现“VFS：cannot open root device “nfs” or unknown-block(0,255)”。请教出现此问题的原因。谢谢！内核启动信息如下：

U-Boot 1.1.3 (Jul 16 2009 - 15:15:33)

U-Boot code: 81080000 -> 810976AC  BSS: -> 810A009C

RAM Configuration:

Bank #0: 80000000 256 MB

MY S29 FLASH  Flash: 32 MB

In:    serial

Out:   serial

Err:   serial

ARM Clock :- 297MHz

DDR Clock :- 189MHz

I2C read: I/O error

Hit key %to stop autoboot:  0

TFTP from server 192.168.8.102; our IP address is 192.168.8.146

Filename 'uImage'.

Load address: 0x80700000

Loading: WARN: emac_send_packet: No link

T #################################################################

         #################################################################

         #################################################################

         #################################################################

         #############################################

done

Bytes transferred = 1557628 (17c47c hex)

## Booting image at 80700000 ...

   Image Name:   Linux-2.6.26.5

   Image Type:   ARM Linux Kernel Image (uncompressed)

   Data Size:    1557564 Bytes =  1.5 MB

   Load Address: 80008000

   Entry Point:  80008000

   Verifying Checksum ... OK

OK

Starting kernel ...

Uncompressing Linux.................................................................................................... done, booting the kernel.

Linux version 2.6.26.5 (root@axyf.localdomain) (gcc version 4.2.0 (MontaVista 4.2.0-16.0.32.0801914 2008-08-30)) #8 Thu Jun 23 15:13:54 CST 2011

CPU: ARM926EJ-S [41069265] revision 5 (ARMv5TEJ), cr=00053177

Machine: DaVinci EVM

Memory policy: ECC disabled, Data cache writeback

DaVinci DM6446 variant 0x1

CPU0: D VIVT write-back cache

CPU0: I cache: 16384 bytes, associativity 4, 32 byte lines, 128 sets

CPU0: D cache: 8192 bytes, associativity 4, 32 byte lines, 64 sets

Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 65024

Kernel command line: console=ttyS0,115200n8 noinitrd rw ip=192.168.8.146:192.168.8.102:192.168.8.102:255.255.0.0:::off root=/dev/nfs nfsroot=192.168.8.102:/home/davinciuser/workdir/filesys, nolock

PID hash table entries: 1024 (order: 10, 4096 bytes)

Console: colour dummy device 80x30

Dentry cache hash table entries: 32768 (order: 5, 131072 bytes)

Inode-cache hash table entries: 16384 (order: 4, 65536 bytes)

Memory: 256MB = 256MB total

Memory: 256512KB available (2916K code, 206K data, 88K init)

SLUB: Genslabs=12, HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1

Mount-cache hash table entries: 512

CPU: Testing write buffer coherency: ok

net_namespace: 192 bytes

NET: Registered protocol family 16

DaVinci: 71 gpio irqs

NET: Registered protocol family 2

IP route cache hash table entries: 2048 (order: 1, 8192 bytes)

TCP established hash table entries: 8192 (order: 4, 65536 bytes)

TCP bind hash table entries: 8192 (order: 3, 32768 bytes)

TCP: Hash tables configured (established 8192 bind 8192)

TCP reno registered

NET: Registered protocol family 1

Installing knfsd (copyright (C) 1996 okir@monad.swb.de).

JFFS2 version 2.2. (NAND) © 2001-2006 Red Hat, Inc.

fuse init (API version 7.9)

JFS: nTxBlock = 2005, nTxLock = 16040

SGI XFS with security attributes, no debug enabled

msgmni has been set to 501

io scheduler noop registered

io scheduler anticipatory registered (default)

Serial: 8250/16550 driver $Revision: 1.90 $ 2 ports, IRQ sharing disabled

serial8250.0: ttyS0 at MMIO 0x1c20000 (irq = 40) is a 16550A

console [ttyS0] enabled

brd: module loaded

TI DaVinci EMAC: MAC address is 08:00:28:32:06:08

TI DaVinci EMAC Linux version updated 4.0

TI DaVinci EMAC: Installed 1 instances.

DaVinci flash: probing 16-bit flash bus

DaVinci flash: Probing for AMD compatible flash...

ADDR_MANUFACTURER = 0x1

ADDR_DEVICE_ID = 0x227e

ADDR_DEVICE_ID2 = 0x2222

ADDR_DEVICE_ID3 = 0x2201

dev_id = 0x2201

DaVinci flash: Found 1 x 16MiB AMD AM29LV256M at 0x0

ADDR_MANUFACTURER = 0x1

ADDR_DEVICE_ID = 0x227e

ADDR_DEVICE_ID2 = 0x2222

ADDR_DEVICE_ID3 = 0x2201

dev_id = 0x2201

DaVinci flash: Found 1 x 16MiB AMD AM29LV256M at 0x1000000

ADDR_MANUFACTURER = 0x90

ADDR_DEVICE_ID = 0x55

ADDR_DEVICE_ID2 = 0x3939

ADDR_DEVICE_ID3 = 0x3535

dev_id = 0x3535

ADDR_MANUFACTURER = 0x90

ADDR_DEVICE_ID = 0x55

ADDR_DEVICE_ID2 = 0x3939

ADDR_DEVICE_ID3 = 0x3535

dev_id = 0x3535

ADDR_MANUFACTURER = 0x90

ADDR_DEVICE_ID = 0x55

ADDR_DEVICE_ID2 = 0x3939

ADDR_DEVICE_ID3 = 0x3535

dev_id = 0x3535

ADDR_MANUFACTURER = 0x90

ADDR_DEVICE_ID = 0x55

ADDR_DEVICE_ID2 = 0x3939

ADDR_DEVICE_ID3 = 0x3535

dev_id = 0x3535

ADDR_MANUFACTURER = 0x90

ADDR_DEVICE_ID = 0x55

ADDR_DEVICE_ID2 = 0xffff

ADDR_DEVICE_ID3 = 0x3535

dev_id = 0x3535

ADDR_MANUFACTURER = 0x90

ADDR_DEVICE_ID = 0x55

ADDR_DEVICE_ID2 = 0xffff

ADDR_DEVICE_ID3 = 0x3535

dev_id = 0x3535

ADDR_MANUFACTURER = 0x0

ADDR_DEVICE_ID = 0x0

ADDR_DEVICE_ID2 = 0x0

ADDR_DEVICE_ID3 = 0x0

dev_id = 0x0

ADDR_MANUFACTURER = 0x0

ADDR_DEVICE_ID = 0x0

ADDR_DEVICE_ID2 = 0x0

ADDR_DEVICE_ID3 = 0x0

dev_id = 0x0

ADDR_MANUFACTURER = 0x0

ADDR_DEVICE_ID = 0x0

ADDR_DEVICE_ID2 = 0x0

ADDR_DEVICE_ID3 = 0x0

dev_id = 0x0

ADDR_MANUFACTURER = 0x0

ADDR_DEVICE_ID = 0x0

ADDR_DEVICE_ID2 = 0x0

ADDR_DEVICE_ID3 = 0x0

dev_id = 0x0

ADDR_MANUFACTURER = 0x0

ADDR_DEVICE_ID = 0x0

ADDR_DEVICE_ID2 = 0x0

ADDR_DEVICE_ID3 = 0x0

dev_id = 0x0

ADDR_MANUFACTURER = 0x0

ADDR_DEVICE_ID = 0x0

ADDR_DEVICE_ID2 = 0x0

ADDR_DEVICE_ID3 = 0x0

dev_id = 0x0

ADDR_MANUFACTURER = 0x0

ADDR_DEVICE_ID = 0x0

ADDR_DEVICE_ID2 = 0x0

ADDR_DEVICE_ID3 = 0x0

dev_id = 0x0

ADDR_MANUFACTURER = 0x0

ADDR_DEVICE_ID = 0x0

ADDR_DEVICE_ID2 = 0x0

ADDR_DEVICE_ID3 = 0x0

dev_id = 0x0

Unlocking the entire NOR flash.

mice: PS/2 mouse device common for all mice

TCP cubic registered

RPC: Registered udp transport module.

RPC: Registered tcp transport module.

VFS: Cannot open root device "nfs" or unknown-block(0,255)

Please append a correct "root=" boot option; here are the available partitions:

1f00      32768 mtdblock0 (driver?)

Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,255)