Can not mount root on mtd block

[mike]

Dear all
    I am using kernel 2.6.10 with patched cvs mtd and my flash mapping 
driver. I also add debug msg on mount_block_root. The return value is 
ENXIO. I am really get mess , because the cfi proded the flash 
successfully, but final result is "no such a device". Does anyone have 
ideas on this?

NOR flash driver (size->0x800000 mem->0x10000000)
NOR Flash 1: Found 1 x8 devices at 0x0 in 8-bit bank
 Amd/Fujitsu Extended Query Table at 0x0040
NOR Flash 1: 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.
Creating 5 MTD partitions on "NOR Flash 1":
0x00000000-0x00100000 : "bootloader"
0x00100000-0x00300000 : "kernel"
0x00300000-0x00500000 : "System RFS"
0x00500000-0x00700000 : "User Application"
0x00700000-0x00800000 : "User Data"
mice: PS/2 mouse device common for all mice
NET: Registered protocol family 2
IP: routing cache hash table of 512 buckets, 4Kbytes
TCP: Hash tables configured (established 1024 bind 2048)
Initializing IPsec netlink socket
NET: Registered protocol family 1
NET: Registered protocol family 17
*VFS: Tried fs_name = <cramfs> err = -6*
VFS: Cannot open root device "mtdblock2" or unknown-block(0,0)
Please append a correct "root=" boot option
Kernel panic - not syncing: VFS: Unable to mount root fs on 
unknown-block(0,0)

Thanks for helping

best regard
Mike,Lee