Ubuntu 作为宿主机 开发板无法通过NFS 挂载根文件系统
我用的是Ubuntu 10.10 + VMware 7.1 主操作系统是XP
今天用开发板通过NFS方式挂载根文件系统，死活挂载不上，VMWEAR 已经设置为桥接，IP地址 都在同一个网段。UBUNTU 自己MOUNT自己可以
别的及其MOUNT NFS共享文件夹也可以。防火墙和杀毒软件都关了，UBUNTU 的UFW
防火墙服务也关闭了。板子拿到别的机器上可以顺利挂载。排除了UBOOT故障的可能。串口打印出如下信息：
## Starting application at 0x30008000 ...
Uncompressing
Linux............................................................................................................
done, booting the kernel.
Linux version 2.6.22.6 (linux@ubuntu) (gcc version 4.3.2
(crosstool-NG-1.8.1-none) ) #26 Wed Dec 1 18:40:47 PST 2010
CPU: ARM920T [41129200] revision 0 (ARMv4T), cr=00007177
Machine: SMDK2410
ATAG_INITRD is deprecated; please update your bootloader.
Memory policy: ECC disabled, Data cache writeback
CPU S3C2410A (id 0x32410002)
S3C2410: core 202.800 MHz, memory 101.400 MHz, peripheral 50.700 MHz
S3C24XX Clocks, (c) 2004 Simtec Electronics
CLOCK: Slow mode (1.500 MHz), fast, MPLL on, UPLL on
CPU0: D VIVT write-back cache
CPU0: I cache: 16384 bytes, associativity 64, 32 byte lines, 8 sets
CPU0: D cache: 16384 bytes, associativity 64, 32 byte lines, 8 sets
Built 1 zonelists. Total pages: 16256
Kernel command line: root=nfs nfsroot=192.168.1.109:/sourcerootfs
ip=192.168.1.111 console=ttySAC0,115200 init=/linuxrc
irq: clearing subpending status 00000002
PID hash table entries: 256 (order: 8, 1024 bytes)
timer tcon=00500000, tcnt a509, tcfg 00000200,00000000, usec 00001e4c
Console: colour dummy device 80x30
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: 61312KB available (2980K code, 440K data, 136K init)
Mount-cache hash table entries: 512
CPU: Testing write buffer coherency: ok
NET: Registered protocol family 16
S3C2410 Power Management, (c) 2004 Simtec Electronics
S3C2410: Initialising architecture
S3C24XX DMA Driver, (c) 2003-2004,2006 Simtec Electronics
DMA channel 0 at c4800000, irq 33
DMA channel 1 at c4800040, irq 34
DMA channel 2 at c4800080, irq 35
DMA channel 3 at c48000c0, irq 36
SCSI subsystem initialized
usbcore: registered new interface driver usbfs
usbcore: registered new interface driver hub
usbcore: registered new device driver usb
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
NetWinder Floating Point Emulator V0.97 (double precision)
Registering GDB sysrq handler
JFFS2 version 2.2. (NAND) © 2001-2006 Red Hat, Inc.
yaffs Dec 1 2010 18:28:46 Installing.
io scheduler noop registered
io scheduler anticipatory registered (default)
io scheduler deadline registered
io scheduler cfq registered
Console: switching to colour frame buffer device 40x30
fb0: s3c2410fb frame buffer device
fb1: Virtual frame buffer device, using 1024K of video memory
lp: driver loaded but no devices found
ppdev: user-space parallel port driver
S3C2410 Watchdog Timer, (c) 2004 Simtec Electronics
Serial: 8250/16550 driver $Revision: 1.90 $ 4 ports, IRQ sharing enabled
s3c2410-uart.0: s3c2410_serial0 at MMIO map 0x50000000 mem 0xf0400000 (irq =
70) is a S3C2410
s3c2410-uart.1: s3c2410_serial1 at MMIO map 0x50004000 mem 0xf0404000 (irq =
73) is a S3C2410
s3c2410-uart.2: s3c2410_serial2 at MMIO map 0x50008000 mem 0xf0408000 (irq =
76) is a S3C2410
RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize
loop: module loaded
dm9000 Ethernet Driver
Cirrus Logic CS8900A driver for Linux (Modified for SMDK2410)
eth0: CS8900A rev D at 0xc4c00300 irq=53, no eeprom , addr: 00:12:34:56:78:9A
Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2
ide: Assuming 50MHz system bus speed for PIO modes; override with idebus=xx
SCSI Media Changer driver v0.25
S3C24XX NAND Driver, (c) 2004 Simtec Electronics
s3c2410-nand s3c2410-nand: Tacls=3, 29ns Twrph0=7 69ns, Twrph1=3 29ns
NAND device: Manufacturer ID: 0xec, Chip ID: 0x76 (Samsung NAND 64MiB 3,3V
8-bit)
Scanning device for bad blocks
Creating 4 MTD partitions on "NAND 64MiB 3,3V 8-bit":
0x00000000-0x00040000 : "u-boot"
0x00040000-0x00240000 : "kernel"
0x00240000-0x00a40000 : "rootfs"
0x00a40000-0x03f40000 : "usrfs"
usbmon: debugfs is not available
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: 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.
mice: PS/2 mouse device common for all mice
S3C24XX RTC, (c) 2004,2006 Simtec Electronics
s3c2410-i2c s3c2410-i2c: slave address 0x10
s3c2410-i2c s3c2410-i2c: bus frequency set to 99 KHz
s3c2410-i2c s3c2410-i2c: i2c-0: S3C I2C adapter
mapped channel 0 to 0
s3c2410-sdi s3c2410-sdi: powered down.
s3c2410-sdi s3c2410-sdi: initialisation done.
TCP cubic registered
NET: Registered protocol family 1
drivers/rtc/hctosys.c: unable to open rtc device (rtc0)
IP-Config: Guessing netmask 255.255.255.0
IP-Config: Complete:
device=eth0, addr=192.168.1.111, mask=255.255.255.0, gw=255.255.255.255,
host=192.168.1.111, domain=, nis-domain=(none),
bootserver=255.255.255.255, rootserver=192.168.1.109, rootpath=
Looking up port of RPC 100003/2 on 192.168.1.109
Looking up port of RPC 100005/1 on 192.168.1.109
Root-NFS: Server returned error -13 while mounting /sourcerootfs
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 2048 mtdblock1 (driver?)
1f02 8192 mtdblock2 (driver?)
1f03 54272 mtdblock3 (driver?)
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(2,0)
向各位高手们求助，这是什么原因呢?
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