Some probem in starting up kernel from U-Boot

Hi all:

Now the own mtd map is created, but there is the tired error info appears:

   RAMDISK driver initialized: 8 RAM disks of 1024K size 1024 blocksize
   UP3: mtd map: 00200000: 00200000 bytes
   UP3: mtd map: virt: 00200000
   Creating 1 MTD partitions on "UP3 Development Board":
   0x00100000-0x00200000 : "cramfs"
   NET: Registered protocol family 2
   IP: routing cache hash table of 512 buckets, 4Kbytes
   TCP established hash table entries: 512 (order: 0, 4096 bytes)
   TCP bind hash table entries: 512 (order: -1, 2048 bytes)
   TCP: Hash tables configured (established 512 bind 512)
   NET: Registered protocol family 17
   VFS: Mounted root (cramfs filesystem) readonly.
   Freeing unused kernel memory: 60k freed (0x1188000 - 0x1196000)
   Warning: unable to open an initial console.
   Kernel panic - not syncing: No init found.  Try passing init= option to kernel.
  

As one partition, the Kernel command line is root=/dev/mtdblock0 ro.

Hope someone have a good way to fix this problem.

Thank you very much!:-)

Best Regards!

Justin