No memory for file system

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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