nfs起根文件系统出错，

vioder_wzb

在.config里面修改启动参数：command line: root=/dev/nfs nfsroot=192.168.1.103:/nfsroot/rootfs ip=192.168.1.106 rw console=ttySAC0 mem=64M，下面是启动时打印的信息：

（出错信息在后面几行，为了完整，将全部的信息都贴上，也许可以先拉到底下直接看出错点，上面是不用看的）
TQ2440 # tftp 31000000 uImage
dm9000 i/o: 0x20000300, id: 0x90000a46
DM9000: running in 16 bit mode
MAC: 00:01:02:03:04:05
TFTP from server 192.168.1.103; our IP address is 192.168.1.106
Filename 'uImage'.
Load address: 0x31000000
Loading: T #################################################################
         #################################################################
         #############################
done
Bytes transferred = 2327288 (2382f8 hex)
TQ2440 # bootm 31000000
## Booting kernel from Legacy Image at 31000000 ...
   Image Name:   Linux-2.6.30.4-EmbedSky
   Created:      2011-10-23  20:48:48 UTC
   Image Type:   ARM Linux Kernel Image (uncompressed)
   Data Size:    2327224 Bytes =  2.2 MB
   Load Address: 30008000
   Entry Point:  30008000
   Verifying Checksum ... OK
   Loading Kernel Image ... OK
OK

Starting kernel ...

Uncompressing Linux.......................................................................................................................................................... done, booting the kernel.
Linux version 2.6.30.4-EmbedSky (root@localhost.wzb) (gcc version 4.3.2 (Sourcery G++ Lite 2008q3-72) ) #3 Mon Oct 24 04:48:41 CST 2011
CPU: ARM920T [41129200] revision 0 (ARMv4T), cr=c0007177
CPU: VIVT data cache, VIVT instruction cache
Machine: TQ2440
Warning: bad configuration page, trying to continue
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:/nfsroot/rootfs ip=192.168.1.106 rw console=ttySAC0 mem=64M
NR_IRQS:85
irq: clearing pending ext status 00080000
irq: clearing subpending status 00000003
irq: clearing subpending status 00000002
PID hash table entries: 256 (order: 8, 1024 bytes)
Console: colour dummy device 80x30
console [ttySAC0] enabled
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: 59840KB available (4344K code, 448K data, 240K init, 0K highmem)
SLUB: Genslabs=11, HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
Calibrating delay loop... 201.93 BogoMIPS (lpj=504832)
Mount-cache hash table entries: 512
CPU: Testing write buffer coherency: ok
net_namespace: 296 bytes
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
s3c2440-i2c s3c2440-i2c: slave address 0x10
s3c2440-i2c s3c2440-i2c: bus frequency set to 98 KHz
s3c2440-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 204
TCP reno registered
NET: Registered protocol family 1
yaffs Oct 24 2011 04:43:02 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 60x17
fb0: s3c2410fb frame buffer device
backlight initialized
GPIO-Control initialized
PWM-Test initialized
adc initialized
s3c2440-uart.0: tq2440_serial0 at MMIO 0x50000000 (irq = 70) is a S3C2440
s3c2440-uart.1: tq2440_serial1 at MMIO 0x50004000 (irq = 73) is a S3C2440
s3c2440-uart.2: tq2440_serial2 at MMIO 0x50008000 (irq = 76) is a S3C2440
loop: module loaded
Driver 'sd' needs updating - please use bus_type methods
dm9000 Ethernet Driver, V1.31
Now use the default MAC address: 10:23:45:67:89:ab
eth0 (dm9000): not using net_device_ops yet
eth0: dm9000e at c4814000,c4818004 IRQ 51 MAC: 10:23:45:67:89:ab (EmbedSky)
S3C24XX NAND Driver, (c) 2004 Simtec Electronics
s3c2440-nand s3c2440-nand: Tacls=2, 19ns Twrph0=3 29ns, Twrph1=2 19ns
NAND device: Manufacturer ID: 0xec, Chip ID: 0xdc (Samsung NAND 512MiB 3,3V 8-bit)
NAND_ECC_NONE selected by board driver. This is not recommended !!
Scanning device for bad blocks
Creating 3 MTD partitions on "NAND 512MiB 3,3V 8-bit":
0x000000000000-0x000000040000 : "EmbedSky_Board_uboot"
0x000000200000-0x000000500000 : "EmbedSky_Board_kernel"
0x000000500000-0x000020000000 : "EmbedSky_Board_yaffs2"
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 2.6.30.4-EmbedSky 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 usbserial
usbserial: USB Serial Driver core
USB Serial support registered for pl2303
usbcore: registered new interface driver pl2303
pl2303: Prolific PL2303 USB to serial adaptor driver
s3c2410_udc: debugfs dir creation failed -19
s3c2440-usbgadget s3c2440-usbgadget: S3C2440: increasing FIFO to 128 bytes
mice: PS/2 mouse device common for all mice
TQ2440 TouchScreen successfully loaded
input: TQ2440 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
cx231xx v4l2 driver loaded.
usbcore: registered new interface driver cx231xx
usbcore: registered new interface driver usbvision
USBVision USB Video Device Driver for Linux : 0.9.10
usbcore: registered new interface driver ov511
ov511: v1.64 for Linux 2.5v511 USB Camera Driver
SE401 usb camera driver version 0.24 registering
usbcore: registered new interface driver se401
usbcore: registered new interface driver stv680
stv680 [usb_stv680_init:1550]
STV(i): usb camera driver version v0.25 registering<6>stv680: v0.25:STV0680 USB Camera Driver
w9968cf: V4L driver for W996[87]CF JPEG USB Dual Mode Camera Chip 1:1.34-basic
usbcore: registered new interface driver w9968cf
usbcore: registered new interface driver zr364xx
zr364xx: Zoran 364xx
usbcore: registered new interface driver stkwebcam
sn9c102: V4L2 driver for SN9C1xx PC Camera Controllers v1:1.47pre49
usbcore: registered new interface driver sn9c102
et61x251: V4L2 driver for ET61X[12]51 PC Camera Controllers v1:1.09
usbcore: registered new interface driver et61x251
pwc: Philips webcam module version 10.0.13 loaded.
pwc: Supports Philips PCA645/646, PCVC675/680/690, PCVC720[40]/730/740/750 & PCVC830/840.
pwc: Also supports the Askey VC010, various Logitech Quickcams, Samsung MPC-C10 and MPC-C30,
pwc: the Creative WebCam 5 & Pro Ex, SOTEC Afina Eye and Visionite VCS-UC300 and VCS-UM100.
usbcore: registered new interface driver Philips webcam
zc0301: V4L2 driver for ZC0301[P] Image Processor and Control Chip v1:1.10
usbcore: registered new interface driver zc0301
gspca: main v2.5.0 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 mars
mars: registered
usbcore: registered new interface driver mr97310a
mr97310a: registered
usbcore: registered new interface driver ov519
ov519: registered
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 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
spca508: registered
usbcore: registered new interface driver spca561
spca561: registered
usbcore: registered new interface driver sq905
sq905: registered
usbcore: registered new interface driver sq905c
sq905c: registered
usbcore: registered new interface driver sunplus
sunplus: registered
usbcore: registered new interface driver stk014
stk014: registered
usbcore: registered new interface driver t613
t613: registered
usbcore: registered new interface driver tv8532
tv8532: registered
usbcore: registered new interface driver vc032x
vc032x: registered
usbcore: registered new interface driver zc3xx
zc3xx: registered
usbcore: registered new interface driver ALi m5602
ALi m5602: registered
usbcore: registered new interface driver STV06xx
STV06xx: registered
usbcore: registered new interface driver ibmcam
usbcore: registered new interface driver ultracam
konicawc: v1.4:Konica Webcam driver
usbcore: registered new interface driver konicawc
usbcore: registered new interface driver vicam
quickcam_messenger: v0.01:Logitech Quickcam Messenger USB
usbcore: registered new interface driver QCM
usbcore: registered new interface driver uvcvideo
USB Video Class driver (v0.1.0)
S3C2410 Watchdog Timer, (c) 2004 Simtec Electronics
s3c2410-wdt s3c2410-wdt: starting watchdog timer
s3c2410-wdt s3c2410-wdt: watchdog active, reset abled, irq enabled
mapped channel 0 to 0
s3c2440-sdi s3c2440-sdi: powered down.
s3c2440-sdi s3c2440-sdi: initialisation done.
usbcore: registered new interface driver usbhid
usbhid: v2.6:USB HID core driver
Advanced Linux Sound Architecture Driver Version 1.0.18a.
No device for DAI UDA134X
No device for DAI s3c24xx-i2s
S3C24XX_UDA134X SoC Audio driver
UDA134X SoC Audio Codec
asoc: UDA134X <-> s3c24xx-i2s mapping ok
ALSA device list:
  #0: S3C24XX_UDA134X (UDA134X)
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 2009-02-01 09:08:18 UTC (123347929
s3c2440-sdi s3c2440-sdi: powered down.
eth0: link down
IP-Config: Guessing netmask 255.255.255.0
IP-Config: Complete:
     device=eth0, addr=192.168.1.106, mask=255.255.255.0, gw=255.255.255.255,
     host=192.168.1.106, domain=, nis-domain=(none),
     bootserver=255.255.255.255, rootserver=192.168.1.103, rootpath=
Looking up port of RPC 100003/2 on 192.168.1.103
eth0: link up, 100Mbps, full-duplex, lpa 0x45E1
Looking up port of RPC 100005/1 on 192.168.1.103
Root-NFS: Server returned error -13 while mounting /nfsroot/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             256 mtdblock0 (driver?)
1f01            3072 mtdblock1 (driver?)
1f02          519168 mtdblock2 (driver?)
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(2,0)
Backtrace:
[<c0049048>] (dump_backtrace+0x0/0x10c) from [<c034f25c>] (dump_stack+0x18/0x1c)
r7:c380c0cb r6:c04bdd40 r5:c380c000 r4:c381df40
[<c034f244>] (dump_stack+0x0/0x1c) from [<c034f2ac>] (panic+0x4c/0x12c)
[<c034f260>] (panic+0x0/0x12c) from [<c0008e4c>] (mount_block_root+0x178/0x234)
r3:00000000 r2:c3835dac r1:c381df40 r0:c0417828
[<c0008cd4>] (mount_block_root+0x0/0x234) from [<c0008fb8>] (mount_root+0xb0/0xf4)
[<c0008f08>] (mount_root+0x0/0xf4) from [<c00090f4>] (prepare_namespace+0xf8/0x190)
r7:c04bd724 r6:c002083c r5:c002083c r4:c002084c
[<c0008ffc>] (prepare_namespace+0x0/0x190) from [<c0008478>] (kernel_init+0xc8/0xf4)
r7:00000000 r6:c001f2ac r5:c001ee90 r4:c001f2ac
[<c00083b0>] (kernel_init+0x0/0xf4) from [<c005a2cc>] (do_exit+0x0/0x620)
r7:00000000 r6:00000000 r5:00000000 r4:00000000

靠后有一段信息是提示NFS设备打不开（Root-NFS: Server returned error -13 while mounting /nfsroot/rootfs），疑惑：服务IP，板IP，掩码都设置正确，在UBOOT下可以PING到宿主机，主机NFS服务也已经启动了，将同一子网的主机ip设置为板一样的可以挂载NFS共享目录，为什么在板上就出错了呢？

yff1030

你的问题解决了没有？

moon146

你内核编译选项对吗？nfs相关的打开了吗？