NFS挂载根文件系统问题

一下是从SD卡启动后，进入u-boot命令行后，通过TFTP下载内核（uImage-dm816x-evm.bin)到内存0x81000000，bootm 0x81000000后的信息

环境变量设置为：ipaddr 192.168.0.12

                                serverip 192.168.0.11

                               bootargs= "console=ttyO2,115200n8 noinitrd init=/linuxrc root=/dev/nfs nfsroot=192.168.0.11:/home/sony/targetfs,nolock rw nfsrootdebug mem=128M ip=192.168.0.12:192.168.0.11:192.168.0.1:255.255.255.0::eth0:off "

## Booting kernel from Legacy Image at 81000000 ...
Image Name: Arago/2.6.37-psp04.04.00.01/dm81
Image Type: ARM Linux Kernel Image (uncompressed)
Data Size: 2563384 Bytes = 2.4 MiB
Load Address: 80008000
Entry Point: 80008000
Verifying Checksum ... OK
Loading Kernel Image ... OK
OK

Starting kernel ...

Uncompressing Linux... done, booting the kernel.
Linux version 2.6.37 (x0029463@swubn01) (gcc version 4.3.3 (Sourcery G++ Lite 2009q1-203) ) #1 Sun Apr 29 20:16:23 IST 2012
CPU: ARMv7 Processor [413fc082] revision 2 (ARMv7), cr=10c53c7f
CPU: VIPT nonaliasing data cache, VIPT aliasing instruction cache
Machine: ti8168evm
reserved size = 52428800 at 0x0
FB: Reserving 52428800 bytes SDRAM for VRAM
Memory policy: ECC disabled, Data cache writeback
OMAP chip is TI8168 2.0
Built 1 zonelists in Zone order, mobility grouping on. Total pages: 19712
Kernel command line: console=ttyO2,115200n8 noinitrd init=/linuxrc root=/dev/nfs nfsroot=192.168.0.11:/home/sony/targetfs,nolock rw nfsrootdebug mem=128M ip=192.168.0.12:192.168.0.11:192.168.0.1:255.255.255.0::eth0:off
PID hash table entries: 512 (order: -1, 2048 bytes)
Dentry cache hash table entries: 16384 (order: 4, 65536 bytes)
Inode-cache hash table entries: 8192 (order: 3, 32768 bytes)
Memory: 78MB = 78MB total
Memory: 73224k/73224k available, 57848k reserved, 0K highmem
Virtual kernel memory layout:
vector : 0xffff0000 - 0xffff1000 ( 4 kB)
fixmap : 0xfff00000 - 0xfffe0000 ( 896 kB)
DMA : 0xffc00000 - 0xffe00000 ( 2 MB)
vmalloc : 0xc8800000 - 0xf8000000 ( 760 MB)
lowmem : 0xc0000000 - 0xc8000000 ( 128 MB)
pkmap : 0xbfe00000 - 0xc0000000 ( 2 MB)
modules : 0xbf000000 - 0xbfe00000 ( 14 MB)
.init : 0xc0008000 - 0xc003b000 ( 204 kB)
.text : 0xc003b000 - 0xc04d8000 (4724 kB)
.data : 0xc04d8000 - 0xc0520f00 ( 292 kB)
SLUB: Genslabs=11, HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
NR_IRQS:407
IRQ: Found an INTC at 0xfa200000 (revision 5.0) with 128 interrupts
Total of 128 interrupts on 1 active controller
GPMC revision 6.0
Trying to install interrupt handler for IRQ400
Trying to install interrupt handler for IRQ401
Trying to install interrupt handler for IRQ402
Trying to install interrupt handler for IRQ403
Trying to install interrupt handler for IRQ404
Trying to install interrupt handler for IRQ405
Trying to install interrupt handler for IRQ406
Trying to install type control for IRQ407
Trying to set irq flags for IRQ407
OMAP clockevent source: GPTIMER1 at 27000000 Hz
Console: colour dummy device 80x30
Calibrating delay loop... 986.31 BogoMIPS (lpj=4931584)
pid_max: default: 32768 minimum: 301
Security Framework initialized
Mount-cache hash table entries: 512
CPU: Testing write buffer coherency: ok
devtmpfs: initialized
omap_voltage_early_init: voltage driver support not added
regulator: core version 0.5
regulator: dummy:
NET: Registered protocol family 16
omap_voltage_domain_lookup: Voltage driver init not yet happened.Faulting!
omap_voltage_add_dev: VDD specified does not exist!
OMAP GPIO hardware version 0.1
OMAP GPIO hardware version 0.1
omap_mux_init: Add partition: #1: core, flags: 0
_omap_mux_get_by_name: Could not find signal i2c2_scl.i2c2_scl
_omap_mux_get_by_name: Could not find signal i2c2_sda.i2c2_sda
NOR: Can't request GPMC CS
registered ti816x_gpio_vr device
registered ti816x_sr device
pm_dbg_init: only OMAP3 supported
registered ti81xx_vpss device
registered ti81xx_vidout device
registered ti81xx on-chip HDMI device
registered ti81xx_fb device
registered ti81xx_vin device
ti81xx_pcie: Invoking PCI BIOS...
ti81xx_pcie: Setting up Host Controller...
ti81xx_pcie: Register base mapped @0xc8820000
ti81xx_pcie: Starting PCI scan...
PCI: bus0: Fast back to back transfers enabled
bio: create slab <bio-0> at 0
regulator: VFB: 800 <--> 1025 mV at 1010 mV
vgaarb: loaded
SCSI subsystem initialized
usbcore: registered new interface driver usbfs
usbcore: registered new interface driver hub
usbcore: registered new device driver usb
USBSS revision 4ea20809
registerd cppi-dma Intr @ IRQ 17
Cppi41 Init Done
omap_i2c omap_i2c.1: bus 1 rev4.0 at 100 kHz
omap_i2c omap_i2c.2: bus 2 rev4.0 at 100 kHz
Advanced Linux Sound Architecture Driver Version 1.0.23.
Switching to clocksource gp timer
musb-hdrc: version 6.0, host, debug=0
musb-hdrc musb-hdrc.0: dma type: dma-cppi41
MUSB controller-0 revision 4ea20800
musb-hdrc musb-hdrc.0: MUSB HDRC host driver
musb-hdrc musb-hdrc.0: new USB bus registered, assigned bus number 1
usb usb1: New USB device found, idVendor=1d6b, idProduct=0002
usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb1: Product: MUSB HDRC host driver
usb usb1: Manufacturer: Linux 2.6.37 musb-hcd
usb usb1: SerialNumber: musb-hdrc.0
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 1 port detected
musb-hdrc musb-hdrc.0: USB Host mode controller at c881e000 using DMA, IRQ 18
musb-hdrc musb-hdrc.1: dma type: dma-cppi41
MUSB controller-1 revision 4ea20800
musb-hdrc musb-hdrc.1: MUSB HDRC host driver
musb-hdrc musb-hdrc.1: new USB bus registered, assigned bus number 2
usb usb2: New USB device found, idVendor=1d6b, idProduct=0002
usb usb2: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb2: Product: MUSB HDRC host driver
usb usb2: Manufacturer: Linux 2.6.37 musb-hcd
usb usb2: SerialNumber: musb-hdrc.1
hub 2-0:1.0: USB hub found
hub 2-0:1.0: 1 port detected
musb-hdrc musb-hdrc.1: USB Host mode controller at c8826800 using DMA, IRQ 19
NET: Registered protocol family 2
IP route cache hash table entries: 1024 (order: 0, 4096 bytes)
TCP established hash table entries: 4096 (order: 3, 32768 bytes)
TCP bind hash table entries: 4096 (order: 2, 16384 bytes)
TCP: Hash tables configured (established 4096 bind 4096)
TCP reno registered
UDP hash table entries: 256 (order: 0, 4096 bytes)
UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
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)
PMU: registered new PMU device of type 0
omap-iommu omap-iommu.0: ducati registered
omap-iommu omap-iommu.1: sys registered
JFFS2 version 2.2. (NAND) ?? 2001-2006 Red Hat, Inc.
msgmni has been set to 143
io scheduler noop registered
io scheduler deadline registered
io scheduler cfq registered (default)
Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
omap_uart.0: ttyO0 at MMIO 0x48020000 (irq = 72) is a OMAP UART0
omap_uart.1: ttyO1 at MMIO 0x48022000 (irq = 73) is a OMAP UART1
omap_uart.2: ttyO2 at MMIO 0x48024000 (irq = 74) is a OMAP UART2
console [ttyO2] enabled
brd: module loaded
loop: module loaded
ahci ahci.0: forcing PORTS_IMPL to 0x3
ahci ahci.0: AHCI 0001.0100 32 slots 2 ports 3 Gbps 0x3 impl platform mode
ahci ahci.0: flags: ncq sntf pm led clo only pmp pio slum part ccc
scsi0 : ahci_platform
scsi1 : ahci_platform
ata1: SATA max UDMA/133 mmio [mem 0x4a140000-0x4a150fff] port 0x100 irq 16
ata2: SATA max UDMA/133 mmio [mem 0x4a140000-0x4a150fff] port 0x180 irq 16
m25p80 spi1.0: found m25p05-nonjedec, expected m25p80
m25p80 spi1.0: m25p05-nonjedec (64 Kbytes)
Creating 4 MTD partitions on "spi_flash":
0x000000000000-0x000000040000 : "U-Boot"
mtd: partition "U-Boot" extends beyond the end of device "spi_flash" -- size truncated to 0x10000
0x000000010000-0x000000012000 : "U-Boot Env"
mtd: partition "U-Boot Env" is out of reach -- disabled
0x000000000000-0x000000280000 : "Kernel"
mtd: partition "Kernel" extends beyond the end of device "spi_flash" -- size truncated to 0x10000
0x000000010000-0x000000010000 : "File System"
mtd: partition "File System" is out of reach -- disabled
omap2-nand driver initializing
ONFI flash detected
ONFI param page 0 valid
NAND device: Manufacturer ID: 0x2c, Chip ID: 0xca (Micron NAND 256MiB 3,3V 16-bit)
Creating 5 MTD partitions on "omap2-nand.0":
0x000000000000-0x000000260000 : "U-Boot"
0x000000260000-0x000000280000 : "U-Boot Env"
0x000000280000-0x0000006c0000 : "Kernel"
0x0000006c0000-0x00000cee0000 : "File System"
0x00000cee0000-0x000010000000 : "Reserved"
davinci_mdio davinci_mdio.0: davinci mdio revision 1.6
davinci_mdio davinci_mdio.0: detected phy mask fffffff9
davinci_mdio.0: probed
davinci_mdio davinci_mdio.0: phy[1]: device 0:01, driver unknown
davinci_mdio davinci_mdio.0: phy[2]: device 0:02, driver unknown
usbcore: registered new interface driver cdc_ether
usbcore: registered new interface driver dm9601
Initializing USB Mass Storage driver...
usbcore: registered new interface driver usb-storage
USB Mass Storage support registered.
mice: PS/2 mouse device common for all mice
omap_rtc omap_rtc: rtc core: registered omap_rtc as rtc0
i2c /dev entries driver
Linux video capture interface: v2.00
usbcore: registered new interface driver uvcvideo
USB Video Class driver (v1.0.0)
OMAP Watchdog Timer Rev 0x00: initial timeout 60 sec
usbcore: registered new interface driver usbhid
usbhid: USB HID core driver
usbcore: registered new interface driver snd-usb-audio
asoc: tlv320aic3x-hifi <-> davinci-mcasp.2 mapping ok
ALSA device list:
#0: TI81XX EVM
TCP cubic registered
NET: Registered protocol family 17
VFP support v0.3: implementor 41 architecture 3 part 30 variant c rev 3
omap_voltage_late_init: Voltage driver support not added
Power Management for TI81XX.
smartreflex smartreflex: Driver initialized
omap_rtc omap_rtc: setting system clock to 2000-01-01 00:00:00 UTC (946684800)
ata1: SATA link down (SStatus 0 SControl 300)
ata2: SATA link down (SStatus 0 SControl 300)
mmc0: new high speed SDHC card at address e624
mmcblk0: mmc0:e624 SD08G 7.40 GiB
mmcblk0: p1 p2 p3
davinci_mdio davinci_mdio.0: resetting idled controller
net eth0: attached PHY driver [Generic PHY] (mii_bus:phy_addr=0:01, id=282f014)
IP-Config: Complete:
device=eth0, addr=192.168.0.12, mask=255.255.255.0, gw=192.168.0.1,
host=192.168.0.12, domain=, nis-domain=(none),
bootserver=192.168.0.11, rootserver=192.168.0.11, rootpath=
Root-NFS: nfsroot=/home/sony/targetfs,nolock
NFS: nfs mount opts='nolock,nolock,addr=192.168.0.11'
NFS: parsing nfs mount option 'nolock'
NFS: parsing nfs mount option 'nolock'
NFS: parsing nfs mount option 'addr=192.168.0.11'
NFS: MNTPATH: '/home/sony/targetfs'
NFS: sending MNT request for 192.168.0.11:/home/sony/targetfs
NFS: failed to create MNT RPC client, status=-113
NFS: unable to mount server 192.168.0.11, error -113
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 64 mtdblock0 (driver?)
1f02 64 mtdblock2 (driver?)
1f04 2432 mtdblock4 (driver?)
1f05 128 mtdblock5 (driver?)
1f06 4352 mtdblock6 (driver?)
1f07 204928 mtdblock7 (driver?)
1f08 50304 mtdblock8 (driver?)
b300 7761920 mmcblk0 driver: mmcblk
b301 40131 mmcblk0p1 00000000-0000-0000-0000-000000000mmcblk0p1
b302 883575 mmcblk0p2 00000000-0000-0000-0000-000000000mmcblk0p2
b303 6835657 mmcblk0p3 00000000-0000-0000-0000-000000000mmcblk0p3
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(2,0)
Backtrace:
[<c0049bb8>] (dump_backtrace+0x0/0x110) from [<c039b7d4>] (dump_stack+0x18/0x1c)
r7:c4bc8000 r6:00000000 r5:c002eb44 r4:c0521710
[<c039b7bc>] (dump_stack+0x0/0x1c) from [<c039b838>] (panic+0x60/0x17c)
[<c039b7d8>] (panic+0x0/0x17c) from [<c00092b4>] (mount_block_root+0x1e0/0x220)
r3:00000000 r2:00000000 r1:c4825f58 r0:c0459cdc
[<c00090d4>] (mount_block_root+0x0/0x220) from [<c00093a0>] (mount_root+0xac/0xcc)
[<c00092f4>] (mount_root+0x0/0xcc) from [<c0009530>] (prepare_namespace+0x170/0x1d4)
r4:c0520f64
[<c00093c0>] (prepare_namespace+0x0/0x1d4) from [<c00087c4>] (kernel_init+0x114/0x154)
r5:c00086b0 r4:c0520f00
[<c00086b0>] (kernel_init+0x0/0x154) from [<c0070c28>] (do_exit+0x0/0x5e4)
r5:c00086b0 r4:00000000