linux-2.6.39.3移植时NFS挂载出错相关解决

面是启动的信息，请求帮助，主机的nfs服务已开启，路径都是正常的，用别人做的内核可以启动nfs，用自己移植的就有找不到root的问题，这个问题我研究了好多天了

AM1808 initialization passed!

Booting TI User Boot Loader

UBL Version: 1.65

UBL Flashtype: NAND

Starting NAND Copy...

Valid magicnum, 0x55424CBB, found in block 0x00000006.

DONE

Jumping to entry point at 0xC1080000.

Flash: ## Unknown flash on Bank 1 - Size = 0x00000000 = 0 MB

NAND: 256 MiB

SF: Detected S25FL064P with page size 256, total 8 MiB

In: serial

Out: serial

Err: serial

ARM Clock : 372000000 Hz

Net: Ethernet PHY: GENERIC @ 0x00

DaVinci-EMAC

Hit any key to stop autoboot: 0

Using DaVinci-EMAC device

TFTP from server 192.168.1.66; our IP address is 192.168.1.9

Filename 'uImage'.

Load address: 0xc0700000

Loading: #################################################################

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

########

done

Bytes transferred = 2012208 (1eb430 hex)

## Booting kernel from Legacy Image at c0700000 ...

Image Name: Linux-2.6.39.3

Image Type: ARM Linux Kernel Image (uncompressed)

Data Size: 2012144 Bytes = 1.9 MiB

Load Address: c0008000

Entry Point: c0008000

Verifying Checksum ... OK

Loading Kernel Image ... OK

OK

Starting kernel ...

Uncompressing Linux... done, booting the kernel.

Linux version 2.6.39.3 (root@localhost.localdomain) (gcc version 4.5.1 (Sourcery G++ Lite 2010.09-50) ) #22 PREEMPT Wed Jul 20 17:46:11 CST 2011

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

CPU: VIVT data cache, VIVT instruction cache

Machine: DaVinci DA850/OMAP-L138/AM18x EVM

Memory policy: ECC disabled, Data cache writeback

DaVinci da850/omap-l138/am18x variant 0x1

Built 1 zonelists in Zone order, mobility grouping on. Total pages: 16256

Kernel command line: noinitrd root=/dev/nfs rw nfsroot=192.168.1.107:/home/shawzy/my_rootfs ip=192.168.1.9:192.168.1.107:192.168.1.1::255.255.255.0 console=ttyS2,115200n8 init=/linuxrc

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: 60748k/60748k available, 4788k reserved, 0K highmem

Virtual kernel memory layout:

vector : 0xffff0000 - 0xffff1000 ( 4 kB)

fixmap : 0xfff00000 - 0xfffe0000 ( 896 kB)

DMA : 0xff000000 - 0xffe00000 ( 14 MB)

vmalloc : 0xc4800000 - 0xfea00000 ( 930 MB)

lowmem : 0xc0000000 - 0xc4000000 ( 64 MB)

modules : 0xbf000000 - 0xc0000000 ( 16 MB)

.init : 0xc0008000 - 0xc0028000 ( 128 kB)

.text : 0xc0028000 - 0xc03c61c0 (3705 kB)

.data : 0xc03c8000 - 0xc03ed780 ( 150 kB)

SLUB: Genslabs=13, HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1

Preemptable hierarchical RCU implementation.

RCU-based detection of stalled CPUs is disabled.

Verbose stalled-CPUs detection is disabled.

NR_IRQS:245

Console: colour dummy device 80x30

Calibrating delay loop... 184.72 BogoMIPS (lpj=923648)

pid_max: default: 32768 minimum: 301

Mount-cache hash table entries: 512

CPU: Testing write buffer coherency: ok

DaVinci: 144 gpio irqs

NET: Registered protocol family 16

casic_nand_pinmux 0

bio: create slab <bio-0> at 0

pca953x 1-0020: failed reading register

pca953x: probe of 1-0020 failed with error -121

pca953x 1-0021: failed reading register

pca953x: probe of 1-0021 failed with error -121

Switching to clocksource timer0_1

Switched to NOHz mode on CPU #0

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

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)

EMAC: MII PHY configured, RMII PHY will not be functional

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

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

msgmni has been set to 118

io scheduler noop registered (default)

start plist test

end plist test

Serial: 8250/16550 driver, 3 ports, IRQ sharing disabled

serial8250.0: ttyS0 at MMIO 0x1c42000 (irq = 25) is a 16550A

serial8250.0: ttyS1 at MMIO 0x1d0c000 (irq = 53) is a 16550A

serial8250.0: ttyS2 at MMIO 0x1d0d000 (irq = 61) is a 16550A

console [ttyS2] enabled

brd: module loaded

NAND device: Manufacturer ID: 0xec, Chip ID: 0xda (Samsung NAND 256MiB 3,3V 8-bit)

Creating 5 MTD partitions on "davinci_nand.1":

0x000000000000-0x000000020000 : "u-boot env"

0x000000020000-0x000000040000 : "UBL"

0x000000040000-0x0000000c0000 : "u-boot"

0x000000200000-0x000000600000 : "kernel"

0x000000600000-0x000010000000 : "filesystem"

davinci_nand davinci_nand.1: controller rev. 2.5

spi_davinci spi_davinci.1: DMA: supported

spi_davinci spi_davinci.1: DMA: RX channel: 18, TX channel: 19, event queue: 0

m25p80 spi1.0: found s25sl064a, expected m25p64

m25p80 spi1.0: s25sl064a (8192 Kbytes)

Creating 6 MTD partitions on "m25p80":

0x000000000000-0x000000010000 : "UBL"

0x000000010000-0x000000090000 : "U-Boot"

0x000000090000-0x0000000a0000 : "U-Boot-Env"

0x0000000a0000-0x000000320000 : "Kernel"

0x000000320000-0x000000720000 : "Filesystem"

0x0000007f0000-0x000000800000 : "MAC-Address"

spi_davinci spi_davinci.1: Controller at 0xfef0e000

davinci_mdio davinci_mdio.0: davinci mdio revision 1.5

davinci_mdio davinci_mdio.0: detected phy mask fffffffe

davinci_mdio.0: probed

davinci_mdio davinci_mdio.0: phy[0]: device 0:00, driver unknown

console [netcon0] enabled

netconsole: network logging started

i2c /dev entries driver

watchdog watchdog: heartbeat 60 sec

cpuidle: using governor ladder

cpuidle: using governor menu

TCP cubic registered

NET: Registered protocol family 17

Registering the dns_resolver key type

davinci_emac_probe: using random MAC addr: 0e:20:03:6e:c6:4a

davinci_mdio davinci_mdio.0: resetting idled controller

net eth0: attached PHY driver [Generic PHY] (mii_bus:phy_addr=0:00, id=7c0f1)

IP-Config: Guessing netmask 255.255.255.0

IP-Config: Complete:

device=eth0, addr=192.168.1.9, mask=255.255.255.0, gw=192.168.1.1,

host=255, domain=, nis-domain=255.255.0,

bootserver=192.168.1.107, rootserver=192.168.1.107, rootpath=

PHY: 0:00 - Link is Up - 100/Full

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 128 mtdblock0 (driver?)

1f01 128 mtdblock1 (driver?)

1f02 512 mtdblock2 (driver?)

1f03 4096 mtdblock3 (driver?)

1f04 256000 mtdblock4 (driver?)

1f05 64 mtdblock5 (driver?)

1f06 512 mtdblock6 (driver?)

1f07 64 mtdblock7 (driver?)

1f08 2560 mtdblock8 (driver?)

1f09 4096 mtdblock9 (driver?)

1f0a 64 mtdblock10 (driver?)

Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(2,0)

解决办法 ：

RMII驱动没有配置上，配置RMII 驱动