用uboot网络启动内核和根文件系统时的问题--出现的问题

我是用freescale开发板，imx28

uboot配置好后启动

PowerPrep start initialize power...
Battery Voltage = 1.07V
No battery or bad battery                                       detected!!!.Disab                                                                                                 ling battery                                    voltage measurements./r/nSep 10 2                                                                                                 01012:30:50
FRAC 0x92925552
Wait for ddr ready 1power 0x00820616
Frac 0x92925552
start change cpu freq
hbus 0x00000003
cpu 0x00010001
start test memory accress
ddr2 0x40000000
finish simple test

U-Boot 2009.08 (Sep 10 2010 - 09:15:06)

Freescale i.MX28 family
CPU:   454 MHz
BUS:   151 MHz
EMI:   205 MHz
DRAM:  128 MB
MMC:   IMX_SSP_MMC: 0, IMX_SSP_MMC: 1
In:    serial
Out:   serial
Err:   serial
Net:   got MAC address from IIM: 00:04:00:00:00:00
FEC0
Hit any key to stop autoboot:  0
Wrong Image Format for bootm command
ERROR: can't get kernel image!
MX28 U-Boot > boot
Wrong Image Format for bootm command
ERROR: can't get kernel image!
MX28 U-Boot > tftp 0x42000000 uImage
Using FEC0 device
TFTP from server 172.16.55.241; our IP address is 172.16.55.248
Filename 'uImage'.
Load address: 0x42000000
Loading: FEC: Link is down 7809
T #################################################################
         #################################################################
         #########################################
done
Bytes transferred = 2499764 (2624b4 hex)
MX28 U-Boot > boot
** Too many args (max. 16) **
## Booting kernel from Legacy Image at 42000000 ...
   Image Name:   Linux-2.6.35.3-571-gcca29a0
   Image Type:   ARM Linux Kernel Image (uncompressed)
   Data Size:    2499700 Bytes =  2.4 MB
   Load Address: 40008000
   Entry Point:  40008000
   Verifying Checksum ... OK
   Loading Kernel Image ... OK
OK

Starting kernel ...

Uncompressing Linux... done, booting the kernel.
Linux version 2.6.35.3-571-gcca29a0 (root@ubuntu) (gcc version 4.4.4 (4.4.4_09.06                                                                                                 .2010) ) #1 PREEMPT Thu Oct 13 19:03:30 PDT 2011
CPU: ARM926EJ-S [41069265] revision 5 (ARMv5TEJ), cr=00053177
CPU: VIVT data cache, VIVT instruction cache
Machine: Freescale MX28EVK board
Memory policy: ECC disabled, Data cache writeback
Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 32512
Kernel command line: console=ttyAM0,115200n8 root=dev/nfs ip=172.16.55.241 nfsroo                                                                                                 t=172.16.55.241:/home/liu/imx28/ltib/rootfs fec_mac=00:04:00:00:00:00 gpmi root=d                                                                                                 ev/nfs ip=172.16.55.241 nfsroot=172.16.55.241:/home/liu/imx28/ltib/rootfs fec_mac                                                                                                 =00:04:00:00:00:00 gpmi root=dev/nfs ip=172.16.55.241 nfsroot=172.16.55.241:/home                                                                                                 /liu/imx28/ltib/rootfs
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: 128MB = 128MB total
Memory: 124520k/124520k available, 6552k reserved, 0K highmem
Virtual kernel memory layout:
    vector  : 0xffff0000 - 0xffff1000   (   4 kB)
    fixmap  : 0xfff00000 - 0xfffe0000   ( 896 kB)
    DMA     : 0xfde00000 - 0xffe00000   (  32 MB)
    vmalloc : 0xc8800000 - 0xf0000000   ( 632 MB)
    lowmem  : 0xc0000000 - 0xc8000000   ( 128 MB)
    modules : 0xbf000000 - 0xc0000000   (  16 MB)
      .init : 0xc0008000 - 0xc0030000   ( 160 kB)
      .text : 0xc0030000 - 0xc04c5000   (4692 kB)
      .data : 0xc04c6000 - 0xc0502a00   ( 243 kB)
SLUB: Genslabs=11, HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
Hierarchical RCU implementation.
        RCU-based detection of stalled CPUs is disabled.
        Verbose stalled-CPUs detection is disabled.
NR_IRQS:288
Console: colour dummy device 80x30
console [ttyAM0] enabled
Calibrating delay loop... 226.09 BogoMIPS (lpj=1130496)
pid_max: default: 32768 minimum: 301
Security Framework initialized
SELinux:  Initializing.
Mount-cache hash table entries: 512
CPU: Testing write buffer coherency: ok
regulator: core version 0.5
NET: Registered protocol family 16
regulator: vddd: 800 <--> 1575 mV at 1500 mV fast normal
regulator: vdddbo: 800 <--> 1575 mV fast normal
regulator: vdda: 1500 <--> 2275 mV at 1800 mV fast normal
vddio = 3380000, val=10
regulator: vddio: 2880 <--> 3680 mV at 3380 mV fast normal
regulator: overall_current: fast normal
regulator: vbus5v:
regulator: mxs-duart-1: fast normal
regulator: mxs-bl-1: fast normal
regulator: mxs-i2c-1: fast normal
regulator: mmc_ssp-1: fast normal
regulator: mmc_ssp-2: fast normal
regulator: charger-1: fast normal
regulator: power-test-1: fast normal
regulator: cpufreq-1: fast normal
i.MX IRAM pool: 124 KB@0xc8820000
Initializing GPMI pins
usb DR wakeup device is registered
IMX usb wakeup probe
audit: cannot initialize inotify handle
bio: create slab <bio-0> at 0
SCSI subsystem initialized
Freescale USB OTG Driver loaded, $Revision: 1.55 $
usbcore: registered new interface driver usbfs
usbcore: registered new interface driver hub
usbcore: registered new device driver usb
Switching to clocksource mxs clock source
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.
Bus freq driver module loaded
IMX usb wakeup probe
usb h1 wakeup device is registered
mxs_cpu_init: cpufreq init finished
audit: initializing netlink socket (disabled)
type=2000 audit(0.620:1): initialized
VFS: Disk quotas dquot_6.5.2
Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
JFFS2 version 2.2. (NAND) © 2001-2006 Red Hat, Inc.
msgmni has been set to 243
alg: No test for stdrng (krng)
cryptodev: driver loaded.
Block layer SCSI generic (bsg) driver version 0.4 loaded (major 253)
io scheduler noop registered
io scheduler deadline registered
io scheduler cfq registered (default)
Console: switching to colour frame buffer device 100x30

mxs-duart.0: ttyAM0 at MMIO 0x80074000 (irq = 47) is a DebugUART
mxs-auart.0: ttySP0 at MMIO 0x8006a000 (irq = 112) is a mxs-auart.0
Found APPUART 3.1.0
mxs-auart.1: ttySP1 at MMIO 0x8006c000 (irq = 113) is a mxs-auart.1
Found APPUART 3.1.0
mxs-auart.2: ttySP2 at MMIO 0x8006e000 (irq = 114) is a mxs-auart.2
Found APPUART 3.1.0
mxs-auart.3: ttySP3 at MMIO 0x80070000 (irq = 115) is a mxs-auart.3
Found APPUART 3.1.0
brd: module loaded
loop: module loaded
i.MX GPMI NFC
NFC: Version 1, 8-chip GPMI and BCH
Boot ROM: Version 1, Single-chip boot area, block mark swapping supported
Scanning for NAND Flash chips...
NAND device: Manufacturer ID: 0xec, Chip ID: 0xf1 (Samsung NAND 128MiB 3,3V 8-bit)
-----------------------------
NAND Flash Device Information
-----------------------------
Manufacturer      : Samsung (0xec)
Device Code       : 0xf1
Cell Technology   : SLC
Chip Size         : 128 MiB
Pages per Block   : 64
Page Geometry     : 2048+64
ECC Strength      : 4 bits
ECC Size          : 512 B
Data Setup Time   : 15 ns
Data Hold Time    : 12 ns
Address Setup Time: 20 ns
GPMI Sample Delay : 6 ns
tREA              : Unknown
tRLOH             : Unknown
tRHOH             : Unknown
Description       : K9F1F08
-----------------
Physical Geometry
-----------------
Chip Count             : 1
Page Data Size in Bytes: 2048 (0x800)
Page OOB Size in Bytes : 64
Block Size in Bytes    : 131072 (0x20000)
Block Size in Pages    : 64 (0x40)
Chip Size in Bytes     : 134217728 (0x8000000)
Chip Size in Pages     : 65536 (0x10000)
Chip Size in Blocks    : 1024 (0x400)
Medium Size in Bytes   : 134217728 (0x8000000)
------------
NFC Geometry
------------
ECC Algorithm          : BCH
ECC Strength           : 8
Page Size in Bytes     : 2112
Metadata Size in Bytes : 10
ECC Chunk Size in Bytes: 512
ECC Chunk Count        : 4
Payload Size in Bytes  : 2048
Auxiliary Size in Bytes: 16
Auxiliary Status Offset: 12
Block Mark Byte Offset : 1999
Block Mark Bit Offset  : 0
-----------------
Boot ROM Geometry
-----------------
Boot Area Count            : 1
Boot Area Size in Bytes    : 20971520 (0x1400000)
Stride Size in Pages       : 64
Search Area Stride Exponent: 2
Scanning device for bad blocks
Bad eraseblock 1021 at 0x000007fa0000
Boot area protection is enabled.
Creating 2 MTD partitions on "gpmi-nfc-main":
0x000000000000-0x000001400000 : "gpmi-nfc-0-boot"
0x000001400000-0x000008000000 : "gpmi-nfc-general-use"
mxs-spi mxs-spi.0: Max possible speed 24000 = 24000000/2 kHz
mxs-spi mxs-spi.0: at 0x80014000 mapped to 0xF0014000, irq=84, bus 1, DMA ver_major 4
FEC Ethernet Driver
fec_enet_mii_bus: probed
ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
fsl-ehci fsl-ehci: Freescale On-Chip EHCI Host Controller
fsl-ehci fsl-ehci: new USB bus registered, assigned bus number 1
fsl-ehci fsl-ehci: irq 93, io base 0x80080000
fsl-ehci fsl-ehci: USB 2.0 started, EHCI 1.00
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 1 port detected
fsl-ehci fsl-ehci.0: Freescale On-Chip EHCI Host Controller
fsl-ehci fsl-ehci.0: new USB bus registered, assigned bus number 2
fsl-ehci fsl-ehci.0: irq 92, io base 0x80090000
fsl-ehci fsl-ehci.0: USB 2.0 started, EHCI 1.00
hub 2-0:1.0: USB hub found
hub 2-0:1.0: 1 port detected
Initializing USB Mass Storage driver...
usbcore: registered new interface driver usb-storage
USB Mass Storage support registered.
ARC USBOTG Device Controller driver (1 August 2005)
mice: PS/2 mouse device common for all mice
input: mxs-kbd as /devices/platform/mxs-kbd.0/input/input0
input: MXS touchscreen as /devices/virtual/input/input1
MXS RTC driver v1.0 hardware v2.3.0
mxs-rtc mxs-rtc.0: rtc core: registered mxs-rtc as rtc0
IR NEC protocol handler initialized
IR RC5(x) protocol handler initialized
IR RC6 protocol handler initialized
IR JVC protocol handler initialized
IR Sony protocol handler initialized
Linux video capture interface: v2.00
mxs-pxp mxs-pxp.0: initialized
WARNING : No battery connected !
Aborting power driver initialization
mxs-battery: probe of mxs-battery.0 failed with error 1
mxs watchdog: initialized, heartbeat 19 sec
mxs-mmc: MXS SSP Controller MMC Interface driver
mxs-mmc mxs-mmc.0: mmc0: MXS SSP MMC DMAIRQ 82 ERRIRQ 96
dcp dcp.0: DCP crypto enabled.!
usbcore: registered new interface driver hiddev
usbcore: registered new interface driver usbhid
usbhid: USB HID core driver
TCP cubic registered
NET: Registered protocol family 17
can: controller area network core (rev 20090105 abi 8)
NET: Registered protocol family 29
can: raw protocol (rev 20090105)
mxs-rtc mxs-rtc.0: setting system clock to 1970-01-01 00:00:33 UTC (33)
mmc0: new SDHC card at address e624
mmcblk0: mmc0:e624 SD04G 3.69 GiB
 mmcblk0: p1 p2 p3
eth0: Freescale FEC PHY driver [Generic PHY] (mii_bus:phy_addr=0:00, irq=-1)
eth1: Freescale FEC PHY driver [Generic PHY] (mii_bus:phy_addr=0:01, irq=-1)
Sending DHCP requests .
PHY: 0:00 - Link is Up - 100/Full
.
DHCP/BOOTP: Ignoring delayed packet
.
DHCP/BOOTP: Ignoring delayed packet
.
DHCP/BOOTP: Ignoring delayed packet
.
DHCP/BOOTP: Ignoring delayed packet
.
DHCP/BOOTP: Ignoring delayed packet
 timed out!
IP-Config: Retrying forever (NFS root)...
FEC: MDIO read timeout
eth0: Could not attach to PHY
IP-Config: Failed to open eth0
FEC: MDIO read timeout
eth1: Could not attach to PHY
IP-Config: Failed to open eth1
IP-Config: No network devices available.
Looking up port of RPC 100003/2 on 172.16.55.241
rpcbind: server 172.16.55.241 not responding, timed out
Root-NFS: Unable to get nfsd port number from server, using default
Looking up port of RPC 100005/1 on 172.16.55.241
rpcbind: server 172.16.55.241 not responding, timed out
Root-NFS: Unable to get mountd port number from server, using default
Root-NFS: Server returned error -101 while mounting /home/liu/imx28/ltib/rootfs
VFS: Unable to mount root fs via NFS, trying floppy.
VFS: Cannot open root device "dev/nfs" or unknown-block(2,0)
Please append a correct "root=" boot option; here are the available partitions:
1f00           20480 mtdblock0 (driver?)
1f01          110592 mtdblock1 (driver?)
b300         3872256 mmcblk0 driver: mmcblk
  b301         3869312 mmcblk0p1
  b302            1025 mmcblk0p2
  b303            1024 mmcblk0p3
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(2,0)
Backtrace:
[<c0034460>] (dump_backtrace+0x0/0x114) from [<c03a1358>] (dump_stack+0x18/0x1c)
 r7:c044cbbe r6:00008000 r5:c746d000 r4:c0503918
[<c03a1340>] (dump_stack+0x0/0x1c) from [<c03a13c4>] (panic+0x68/0xec)
[<c03a135c>] (panic+0x0/0xec) from [<c0009020>] (mount_block_root+0x1d8/0x218)
 r3:00000000 r2:c7c27e80 r1:c7c27f60 r0:c044cc65
[<c0008e48>] (mount_block_root+0x0/0x218) from [<c0009124>] (mount_root+0xc4/0xfc)
[<c0009060>] (mount_root+0x0/0xfc) from [<c00092c8>] (prepare_namespace+0x16c/0x1c4)
 r5:c0029a24 r4:c0502cc0
[<c000915c>] (prepare_namespace+0x0/0x1c4) from [<c00084f8>] (kernel_init+0x128/0x170)
 r5:c0028210 r4:c0502a80
[<c00083d0>] (kernel_init+0x0/0x170) from [<c0051454>] (do_exit+0x0/0x6a0)
 r5:c00083d0 r4:00000000

 这是现在出现的情况，

uboot配置情况如下：

ethact=FEC0
gatewayip=172.16.55.1
bootarts=console=ttyAM0,115200n8
baudrate=115200
netmask=255.255.255.0
bootcmd=run bootcmd_net
bootdelay=2
serverip=172.16.55.241
bootfile=uImage
loadaddr=0x42000000
nfsroot=/home/liu/imx28/ltib/rootfs
ipaddr=172.16.55.248
ethaddr=00:04:00:00:00:00
bootargs_nfs=setenv bootargs ${bootargs} root=dev/nfs ip=172.16.55.241 nfsroot=${serverip}:${nfsroot} fec_mac=00:04:00:00:00:00 gpmi
bootcmd_net=run bootargs_nfs; bootm
bootargs=console=ttyAM0,115200n8
stdin=serial
stdout=serial
stderr=serial
ver=U-Boot 2009.08 (Sep 10 2010 - 09:15:06)

现在正在找办法解决