nfs挂载文件系统出错，请高手指教

[淡足迹]

从nfs挂载文件系统时出现的错误,Root-NFS: Server returned error -13 while mounting nfs/rootfs
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 384 mtdblock0 (driver?)
1f01 5120 mtdblock1 (driver?)
1f02 125440 mtdblock2 (driver?)
1f03 131072 mtdblock3 (driver?)
1f04 131072 mtdblock4 (driver?)
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(2,0)
Backtrace:
[<c003123c>] (dump_backtrace+0x0/0x114) from [<c00316c8>] (dump_stack+0x18/0x1c)

r6:c04f5edc r5:c0021850 r4:c3823f48
[<c00316b0>] (dump_stack+0x0/0x1c) from [<c0045dfc>] (panic+0x4c/0x13c)
[<c0045db0>] (panic+0x0/0x13c) from [<c0008e00>] (mount_block_root+0x104/0x234)
r3:c3823eb4 r2:20000013 r1:c3823f48 r0:c0445400
[<c0008cfc>] (mount_block_root+0x0/0x234) from [<c0008ffc>] (mount_root+0xcc/0xf
4)
[<c0008f30>] (mount_root+0x0/0xf4) from [<c000906c>] (prepare_namespace+0x48/0x1
9c)
r7:00000000 r6:c002180c r5:c0021808 r4:c04f5878
[<c0009024>] (prepare_namespace+0x0/0x19c) from [<c0008810>] (kernel_init+0xec/0
x120)
r6:c002095c r5:c0020e54 r4:c04f5658
[<c0008724>] (kernel_init+0x0/0x120) from [<c0048de4>] (do_exit+0x0/0x634)
r6:00000000 r5:00000000 r4:00000000

[deep_pro]

1、首先保证你自己在pc上挂192.168.1.103:/nfs/rootfs 成功
这里expors需要写成
/nfs/rootfs *(rw,sync,no_root_squash)

2、确保你的linux内核已经配置Root file system on NFS 这一项，也就是CONFIG_ROOT_NFS，它依赖于IP_PNP

3、以上2条满足后，你可以试试
setenv boottargs "root=/dev/nfs nfsroot=192.168.1.103:/nfs/rootfs ip=192.168.1.230 rw console=ttySAC0 mem=64M rootdelay=10"

4、如果不成功，你需要修改boottargs中的ip参数，参见http://hi.baidu.com/deep_pro/blog/item/dde127f2de6e0b1eb17ec554.html

5、如果还不成功，沾完整打印输出再看

[淡足迹]

恩，好的，非常感谢！

[淡足迹]

U-Boot 2009.11 ( 3鏈?27 2011 - 19:15:54)
modified by www.Enjoylinux.cn
I2C: ready
DRAM: 64 MB
Flash: 2 MB
NAND: 128 MiB
Video: 320x240x16 18kHz 69Hz
In: serial
Out: serial
Err: serial
Net: dm9000
U-Boot 2009.11 ( 3鏈?27 2011 - 19:15:54)
modified by www.Enjoylinux.cn

Hit any key to stop autoboot: 0

NAND read: device 0 offset 0x80000, size 0x300000
3145728 bytes read: OK
## Booting kernel from Legacy Image at 30008000 ...
Image Name: Linux-2.6.32.2-GQ2440
Created: 2011-03-27 10:20:12 UTC
Image Type: ARM Linux Kernel Image (uncompressed)
Data Size: 2499600 Bytes = 2.4 MB
Load Address: 30008000
Entry Point: 30008040
Verifying Checksum ... OK
XIP Kernel Image ... OK
OK

Starting kernel ...

Uncompressing Linux.............................................................
................................................................................
.................... done, booting the kernel.
Linux version 2.6.32.2-GQ2440 ([e-mail]) (gcc version 4.2.2) #
1 Sun Mar 27 18:20:06 CST 2011
CPU: ARM920T [41129200] revision 0 (ARMv4T), cr=c0007177
CPU: VIVT data cache, VIVT instruction cache
Machine: S3C2440A ARM2440 development board
Memory policy: ECC disabled, Data cache writeback
CPU S3C2440A (id 0x32440001)
S3C24XX Clocks, (c) 2004 Simtec Electronics
S3C244X: core 405.000 MHz, memory 101.250 MHz, peripheral 50.625 MHz
CLOCK: Slow mode (1.500 MHz), fast, MPLL on, UPLL on
Built 1 zonelists in Zone order, mobility grouping on. Total pages: 16256
Kernel command line: root=/dev/nfs nfsroot=192.168.1.103:nfs/rootfs ip=192.168.1
.230 rw console=ttySAC0 mem=64M rootdelay=10
PID hash table entries: 256 (order: -2, 1024 bytes)
Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)
Inode-cache hash table entries: 4096 (order: 2, 16384 bytes)
Memory: 64MB = 64MB total
Memory: 59616KB available (4636K code, 469K data, 144K init, 0K highmem)
SLUB: Genslabs=11, HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
Hierarchical RCU implementation.
NR_IRQS:85
irq: clearing subpending status 00000002
Console: colour dummy device 80x30
console [ttySAC0] enabled
Calibrating delay loop... 201.93 BogoMIPS (lpj=504832)
Mount-cache hash table entries: 512
CPU: Testing write buffer coherency: ok
NET: Registered protocol family 16
S3C2440: Initialising architecture
S3C2440: IRQ Support
S3C24XX DMA Driver, (c) 2003-2004,2006 Simtec Electronics
DMA channel 0 at c4808000, irq 33
DMA channel 1 at c4808040, irq 34
DMA channel 2 at c4808080, irq 35
DMA channel 3 at c48080c0, irq 36
S3C244X: Clock Support, DVS off
bio: create slab <bio-0> at 0
SCSI subsystem initialized
usbcore: registered new interface driver usbfs
usbcore: registered new interface driver hub
usbcore: registered new device driver usb
s3c-i2c s3c2440-i2c: slave address 0x10
s3c-i2c s3c2440-i2c: bus frequency set to 98 KHz
s3c-i2c s3c2440-i2c: i2c-0: S3C I2C adapter
cfg80211: Calling CRDA to update world regulatory domain
NET: Registered protocol family 2
IP route cache hash table entries: 1024 (order: 0, 4096 bytes)
TCP established hash table entries: 2048 (order: 2, 16384 bytes)
TCP bind hash table entries: 2048 (order: 1, 8192 bytes)
TCP: Hash tables configured (established 2048 bind 2048)
TCP reno registered
NET: Registered protocol family 1
RPC: Registered udp transport module.
RPC: Registered tcp transport module.
RPC: Registered tcp NFSv4.1 backchannel transport module.
NetWinder Floating Point Emulator V0.97 (double precision)
yaffs Mar 27 2011 18:18:22 Installing.
msgmni has been set to 116
alg: No test for stdrng (krng)
io scheduler noop registered (default)
Console: switching to colour frame buffer device 40x15
fb0: s3c2410fb frame buffer device
backlight initialized
leds initialized
buttons initialized
pwm initialized
adc initialized
s3c2440-uart.0: s3c2410_serial0 at MMIO 0x50000000 (irq = 70) is a S3C2440
s3c2440-uart.1: s3c2410_serial1 at MMIO 0x50004000 (irq = 73) is a S3C2440
s3c2440-uart.2: s3c2410_serial2 at MMIO 0x50008000 (irq = 76) is a S3C2440
loop: module loaded
S3C24XX NAND Driver, (c) 2004 Simtec Electronics
s3c24xx-nand s3c2440-nand: Tacls=3, 29ns Twrph0=7 69ns, Twrph1=3 29ns
s3c24xx-nand s3c2440-nand: NAND soft ECC
NAND device: Manufacturer ID: 0xec, Chip ID: 0xf1 (Samsung NAND 128MiB 3,3V 8-bi
t)
Scanning device for bad blocks
Bad eraseblock 161 at 0x000001420000
Bad eraseblock 293 at 0x0000024a0000
Bad eraseblock 352 at 0x000002c00000
Creating 5 MTD partitions on "NAND 128MiB 3,3V 8-bit":
0x000000000000-0x000000060000 : "bootloader"
0x000000080000-0x000000580000 : "kernel"
0x000000580000-0x000040580000 : "root"
mtd: partition "root" extends beyond the end of device "NAND 128MiB 3,3V 8-bit"
-- size truncated to 0x7a80000
0x000000000000-0x000008000000 : "<NULL>"
0x000000000000-0x000040000000 : "nand"
mtd: partition "nand" extends beyond the end of device "NAND 128MiB 3,3V 8-bit"
-- size truncated to 0x8000000
dm9000 Ethernet Driver, V1.31
eth0: dm9000e at c4814300,c4818304 IRQ 51 MAC: 08:90:90:90:90:90 (chip)
Atmel at76x USB Wireless LAN Driver 0.17 loading
usbcore: registered new interface driver at76c50x-usb
usbcore: registered new interface driver zd1211rw
usbcore: registered new interface driver rtl8187
usbcore: registered new interface driver zd1201
usbcore: registered new interface driver rt2500usb
usbcore: registered new interface driver rt73usb
usbcore: registered new interface driver rt2800usb
usbcore: registered new interface driver ar9170usb
ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
s3c2410-ohci s3c2410-ohci: S3C24XX OHCI
s3c2410-ohci s3c2410-ohci: new USB bus registered, assigned bus number 1
s3c2410-ohci s3c2410-ohci: irq 42, io mem 0x49000000
usb usb1: New USB device found, idVendor=1d6b, idProduct=0001
usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb1: Product: S3C24XX OHCI
usb usb1: Manufacturer: Linux 2.6.32.2-GQ2440 ohci_hcd
usb usb1: SerialNumber: s3c24xx
usb usb1: configuration #1 chosen from 1 choice
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 2 ports detected
Initializing USB Mass Storage driver...
usbcore: registered new interface driver usb-storage
USB Mass Storage support registered.
usbcore: registered new interface driver ums-alauda
usbcore: registered new interface driver ums-cypress
usbcore: registered new interface driver ums-datafab
usbcore: registered new interface driver ums-freecom
usbcore: registered new interface driver ums-isd200
usbcore: registered new interface driver ums-jumpshot
usbcore: registered new interface driver ums-karma
usbcore: registered new interface driver ums-onetouch
usbcore: registered new interface driver ums-sddr09
usbcore: registered new interface driver ums-sddr55
usbcore: registered new interface driver ums-usbat
usbcore: registered new interface driver usbserial
USB Serial support registered for generic
usbcore: registered new interface driver usbserial_generic
usbserial: USB Serial Driver core
USB Serial support registered for aircable
usbcore: registered new interface driver aircable
USB Serial support registered for ark3116
usbcore: registered new interface driver ark3116
USB Serial support registered for Belkin / Peracom / GoHubs USB Serial Adapter
usbcore: registered new interface driver belkin
belkin_sa: v1.2:USB Belkin Serial converter driver
USB Serial support registered for ch341-uart
usbcore: registered new interface driver ch341

高手，这是我加了rootdelay后的结果。1和2我都是满足的

[淡足迹]

接上面的代码
USB Serial support registered for cp210x
usbcore: registered new interface driver cp210x
cp210x: v0.09:Silicon Labs CP210x RS232 serial adaptor driver
USB Serial support registered for Reiner SCT Cyberjack USB card reader
usbcore: registered new interface driver cyberjack
cyberjack: v1.01 Matthias Bruestle
cyberjack: REINER SCT cyberJack pinpad/e-com USB Chipcard Reader Driver
USB Serial support registered for DeLorme Earthmate USB
USB Serial support registered for HID->COM RS232 Adapter
USB Serial support registered for Nokia CA-42 V2 Adapter
usbcore: registered new interface driver cypress
cypress_m8: v1.09:Cypress USB to Serial Driver
USB Serial support registered for Digi 2 port USB adapter
USB Serial support registered for Digi 4 port USB adapter
usbcore: registered new interface driver digi_acceleport
digi_acceleport: v1.80.1.2:Digi AccelePort USB-2/USB-4 Serial Converter driver
USB Serial support registered for Edgeport 2 port adapter
USB Serial support registered for Edgeport 4 port adapter
USB Serial support registered for Edgeport 8 port adapter
USB Serial support registered for EPiC device
usbcore: registered new interface driver io_edgeport
io_edgeport: v2.7:Edgeport USB Serial Driver
USB Serial support registered for Edgeport TI 1 port adapter
USB Serial support registered for Edgeport TI 2 port adapter
usbcore: registered new interface driver io_ti
io_ti: v0.7mode043006:Edgeport USB Serial Driver
USB Serial support registered for empeg
usbcore: registered new interface driver empeg
empeg: v1.2:USB Empeg Mark I/II Driver
USB Serial support registered for FTDI USB Serial Device
usbcore: registered new interface driver ftdi_sio
ftdi_sio: v1.5.0:USB FTDI Serial Converters Driver
USB Serial support registered for funsoft
usbcore: registered new interface driver funsoft
USB Serial support registered for Garmin GPS usb/tty
usbcore: registered new interface driver garmin_gps
garmin_gps: v0.33:garmin gps driver
USB Serial support registered for hp4X
usbcore: registered new interface driver hp4X
hp4x: v1.00:HP4x (48/49) Generic Serial driver
USB Serial support registered for PocketPC PDA
usbcore: registered new interface driver ipaq
ipaq: v0.5:USB PocketPC PDA driver
USB Serial support registered for IPWireless converter
usbcore: registered new interface driver ipwtty
ipw: v0.3:IPWireless tty driver
USB Serial support registered for IR Dongle
usbcore: registered new interface driver ir-usb
ir_usb: v0.4:USB IR Dongle driver
USB Serial support registered for iuu_phoenix
usb 1-1: new full speed USB device using s3c2410-ohci and address 2
usbcore: registered new interface driver iuu_phoenix
iuu_phoenix: v0.11:Infinity USB Unlimited Phoenix driver
USB Serial support registered for Keyspan - (without firmware)
USB Serial support registered for Keyspan 1 port adapter
USB Serial support registered for Keyspan 2 port adapter
USB Serial support registered for Keyspan 4 port adapter
usbcore: registered new interface driver keyspan
keyspan: v1.1.5:Keyspan USB to Serial Converter Driver
USB Serial support registered for Keyspan PDA
USB Serial support registered for Keyspan PDA - (prerenumeration)
USB Serial support registered for Xircom / Entregra PGS - (prerenumeration)
usbcore: registered new interface driver keyspan_pda
keyspan_pda: v1.1:USB Keyspan PDA Converter driver
USB Serial support registered for KL5KUSB105D / PalmConnect
usbcore: registered new interface driver kl5kusb105d
kl5kusb105: v0.3a:KLSI KL5KUSB105 chipset USB->Serial Converter driver
USB Serial support registered for KOBIL USB smart card terminal
usbcore: registered new interface driver kobil
kobil_sct: 21/05/2004:KOBIL USB Smart Card Terminal Driver (experimental)
USB Serial support registered for MCT U232
usbcore: registered new interface driver mct_u232
mct_u232: z2.1:Magic Control Technology USB-RS232 converter driver
USB Serial support registered for Moschip 2 port adapter
mos7720: 1.0.0.4F:Moschip USB Serial Driver
usbcore: registered new interface driver moschip7720
USB Serial support registered for Moschip 7840/7820 USB Serial Driver
mos7840: 1.3.2:Moschip 7840/7820 USB Serial Driver
usbcore: registered new interface driver mos7840
USB Serial support registered for moto-modem
usbcore: registered new interface driver moto-modem
USB Serial support registered for navman
usbcore: registered new interface driver navman
USB Serial support registered for ZyXEL - omni.net lcd plus usb
usb 1-1: device descriptor read/64, error -62
usbcore: registered new interface driver omninet
omninet: v1.1:USB ZyXEL omni.net LCD PLUS Driver
USB Serial support registered for opticon
usbcore: registered new interface driver opticon
USB Serial support registered for GSM modem (1-port)
usbcore: registered new interface driver option
option: v0.7.2:USB Driver for GSM modems
USB Serial support registered for oti6858
usbcore: registered new interface driver oti6858
USB Serial support registered for pl2303
usbcore: registered new interface driver pl2303
pl2303: Prolific PL2303 USB to serial adaptor driver
USB Serial support registered for Qualcomm USB modem
usbcore: registered new interface driver qcserial
safe_serial: v0.0b:USB Safe Encapsulated Serial
USB Serial support registered for safe_serial
usbcore: registered new interface driver safe_serial
USB Serial support registered for siemens_mpi
usbcore: registered new interface driver siemens_mpi
Driver for Siemens USB/MPI adapter
Version 0.1 09/26/2005 Thomas [e-mail] http://libnodave.sf.net
USB Serial support registered for Sierra USB modem
usbcore: registered new interface driver sierra
sierra: v.1.3.8:USB Driver for Sierra Wireless USB modems
USB Serial support registered for SPCP8x5
usbcore: registered new interface driver spcp8x5
spcp8x5: v0.04:SPCP8x5 USB to serial adaptor driver
USB Serial support registered for symbol
usbcore: registered new interface driver symbol
USB Serial support registered for TI USB 3410 1 port adapter
USB Serial support registered for TI USB 5052 2 port adapter
usbcore: registered new interface driver ti_usb_3410_5052
ti_usb_3410_5052: v0.9:TI USB 3410/5052 Serial Driver
USB Serial support registered for Handspring Visor / Palm OS
USB Serial support registered for Sony Clie 3.5
USB Serial support registered for Sony Clie 5.0
usbcore: registered new interface driver visor
visor: USB HandSpring Visor / Palm OS driver
USB Serial support registered for Connect Tech - WhiteHEAT - (prerenumeration)
USB Serial support registered for Connect Tech - WhiteHEAT
usbcore: registered new interface driver whiteheat
whiteheat: v2.0:USB ConnectTech WhiteHEAT driver
mice: PS/2 mouse device common for all mice
s3c2410 TouchScreen successfully loaded
input: s3c2410 TouchScreen as /devices/virtual/input/input0
S3C24XX RTC, (c) 2004,2006 Simtec Electronics
s3c2410-rtc s3c2410-rtc: rtc disabled, re-enabling
s3c2410-rtc s3c2410-rtc: rtc core: registered s3c as rtc0
i2c /dev entries driver
Linux video capture interface: v2.00
gspca: main v2.7.0 registered
usbcore: registered new interface driver conex
conex: registered
usbcore: registered new interface driver etoms
etoms: registered
usbcore: registered new interface driver finepix
finepix: registered
usbcore: registered new interface driver jeilinj
jeilinj: registered
usbcore: registered new interface driver mars
mars: registered
usbcore: registered new interface driver mr97310a
mr97310a: registered
usbcore: registered new interface driver ov519
ov519: registered
usb 1-1: device descriptor read/64, error -62
usbcore: registered new interface driver ov534
ov534: registered
usbcore: registered new interface driver pac207
pac207: registered
usbcore: registered new interface driver pac7311
pac7311: registered
usbcore: registered new interface driver sn9c20x
sn9c20x: registered
usbcore: registered new interface driver sonixb
sonixb: registered
usbcore: registered new interface driver sonixj
sonixj: registered
usbcore: registered new interface driver spca500
spca500: registered
usbcore: registered new interface driver spca501
spca501: registered
usbcore: registered new interface driver spca505
spca505: registered
usbcore: registered new interface driver spca506
spca506: registered
usbcore: registered new interface driver spca508

[deep_pro]

1、关闭你pc上的防火墙
2、保证你的板子的网卡在不用nfs启动时linux下是好用的

[deep_pro]

实在不行 ，就先在你的板子上启别的根文件系统，挂载成功nfs后
再尝试用nfs作为根文件系统启动

[deep_pro]

实在不行 就先用别的文件系统启，然后尝试挂载nfs 保证能成功

然后再尝试用nfs做根文件系统启动

[淡足迹]

谢谢你给了这么多的建议！我用yaffs文件系统能够正常启动，用nfs文件系统，是为了方便把linux里面的编译的东西放到板子里好调试。

[deep_pro]

必须把你的内核启动参数也沾出来

还有，nfs启动时，内核启动参数里最好加上延时 rootdelay=10

[淡足迹]

setenv boottargs "root=/dev/nfs nfsroot=192.168.1.103:/nfs/rootfs ip=192.168.1.230 rw console=ttySAC0 mem=64M"这是我设置的环境变量，请问还需要设置什么？我的expors
里面是这样写的：/nfs *(rw,sync,no_root_squash)
请问哪里还需要设置，谢谢！