No memory for file system

After I download the ucLinux kernel to the board (2S60) successfully. I begin on the filesystem project.

In the wizard, after project name setting, in the "filesystem Options", only ext_flash can be selected as the "Memory Device". Actully the onboard flash is 16M, but 0K is available appeared in target filesystem application selection. Even if I ignore the available memory warning, after build, the file system can not work.

the error messege as follows:

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

nios2-terminal: "USB-Blaster [USB-0]", device 1, instance 0

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

Linux version 2.6.11-uc0 (Administrator@altera) (gcc version 3.4.1 (Altera Nios

II 5.1 b73))# 16 Thu Jan 12 16:24:34 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: 14592k/16384k RAM, 0k/0k ROM (1422k kernel code, 183k 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 0x821208b0 (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: 100000 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:0e:b0:63

smc_probe: 100000 Khz Nios

Altera NDK flash (AMD): Found 1 x16 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)":

0x00200000-0x00800000 : "romfs/jffs2"

0x00000000-0x00200000 : "loader/kernel"

0x00800000-0x00c00000 : "User configuration"

0x00c00000-0x01000000 : "safe configuration"

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

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

nios2-terminal: exiting due to I/O error communicating with target

How can I resolve it?

Regards

Yueran