Why I can't boot uclinux kernal in NIOSＩＩ?

Hello,

I created and build a Linux kernel and filesystem project guided by the file "Linux Quick Start Guide" located in :\altera\kits\nios2_60\documents\linux.Then I secelted tools->flash programmer in IDE,and click the apply-->program flash button to download the executable file:build/vmlinux .

After that I download the .sof file into the development board.When it is done,I open Nios II SDK shell and type nios2-terminal in command line.

[SOPC Builder]$ nios2-terminal

The boot information is as follows:

nios2-terminal: connected to hardware target using JTAG UART on cable

nios2-terminal: "ByteBlasterII [LPT1]", device 1, instance 0

nios2-terminal: (Use the IDE stop button or Ctrl-C to terminate)

Linux version 2.6.11-uc0 (lq1@lq) (gcc version 3.4.1 (Altera Nios II 5.1 b93))# 23 Mon Aug 14 16:36:53 2006

uClinux/Nios II

Altera Nios II support © 2004 Microtronix Datacom Ltd.

Built 1 zonelists

Kernel command line: root=/dev/mtdblock0 ro

PID hash table entries: 128 (order: 7, 2048 bytes)

Dentry cache hash table entries: 4096 (order: 2, 16384 bytes)

Inode-cache hash table entries: 2048 (order: 1, 8192 bytes)

Memory available: 14720k/16384k RAM, 0k/0k ROM (1228k kernel code, 260k data)

Mount-cache hash table entries: 512 (order: 0, 4096 bytes)

NET: Registered protocol family 16

Serial: JTAG UART driver $Revision: 1.4 $

ttyJ0 at MMIO 0x821208d0 (irq = 1) is a jtag_uart

io scheduler noop registered

io scheduler anticipatory registered

io scheduler deadline registered

io scheduler cfq registered

RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize

smc_probe: 50000 Khz Nios

SMSC LAN91C111 Driver (v2.1), (Linux Kernel 2.6)

eth0: SMC91C11xFD(rev:1) at 0x82110300 IRQ:6 MEMSIZE:8192b NOWAIT:0 ADDR: 00:07:ed:0b:04:c9

smc_probe: 50000 Khz Nios

uclinux[mtd]: RAM probe address=0x1174474 size=0x0

Creating 1 MTD partitions on "RAM":

0x00000000-0x00000000 : "ROMfs"

mtd: partition "ROMfs" is out of reach -- disabled

uclinux[mtd]: set ROMfs to be root filesystem

Altera NDK flash (AMD): Found 1 x8 devices at 0x0 in 8-bit bank

Amd/Fujitsu Extended Query Table at 0x0040

Altera NDK flash (AMD): CFI does not contain boot bank location. Assuming top.

number of CFI chips: 1

cfi_cmdset_0002: Disabling erase-suspend-program due to code brokenness.

cmdlinepart partition parsing not available

RedBoot partition parsing not available

Using Altera NDK partition definition

Creating 4 MTD partitions on "Altera NDK flash (AMD)":

0x00200000-0x00600000 : "romfs/jffs2"

0x00000000-0x00200000 : "loader/kernel"

0x00600000-0x00700000 : "User configuration"

0x00700000-0x00800000 : "safe configuration"

microtronix[mtd]: RAM probe address=0x200000 size=0x0

Creating 1 MTD partitions on "RAM":

0x00000000-0x00000000 : "ROMfs"

mtd: partition "ROMfs" is out of reach -- disabled

microtronix[mtd]: set ROMfs to be root filesystem

NET: Registered protocol family 2

IP: routing cache hash table of 512 buckets, 4Kbytes

TCP established hash table entries: 1024 (order: 1, 8192 bytes)

TCP bind hash table entries: 1024 (order: 0, 4096 bytes)

TCP: Hash tables configured (established 1024 bind 1024)

NET: Registered protocol family 1

NET: Registered protocol family 17

end_request: I/O error, dev mtdblock0, sector 2

EXT2-fs: unable to read superblock

end_request: I/O error, dev mtdblock0, sector 0

romfs: unable to read superblock

Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(31,0)

Can anyone here explain the problem?

Thank you very much!