Kernel download problems

After I compile the kernel and download it to the Development Board, the following message is displayed,
VFS: cannot open root device "mtdblock2" or unknown-block (0, 0)
Please append a correct "root =" Boot option; here are the available partitions:
1f00 65536 mtdblock0 (driver ?)
Kernel panic-not syncing: VFS: Unable to mount root FS on unknown-block (0, 0)
Backtrace:
[<C0024428>] (dump_backtrace + 0x0/0x10c) from [<c01cba64>] (dump_stack + 0x18/0 x1c)
R6: c001a83c R5: c0290f84 R4: c0291780 R3: 80000013
[<C01cba4c>] (dump_stack + 0x0/0x1c) from [<c01cbab4>] (panic + 0x4c/0x110)
[<C01cba68>] (panic + 0x0/0x110) from [<c0008d24>] (mount_block_root + 0x1dc/0x29c)
R3: 00000001 R2: 00000000 r1: c381df60 R0: c02375cc
R7: 00008000
[<C0008b48>] (mount_block_root + 0x0/0x29c) from [<c0008e38>] (mount_root + 0x54/0 x6c)
[<C0008de4>] (mount_root + 0x0/0x6c) from [<c0008f78>] (prepare_namespace + 0x128/0x180)
R5: c001a851 R4: c0290f84
[<C0008e50>] (prepare_namespace + 0x0/0x180) from [<c00089c4>] (kernel_init + 0xbc/0xe8)
R5: c0019800 R4: c0019800
[<C0008908>] (kernel_init + 0x0/0xe8) from [<c0044f10>] (do_exit + 0x0/0x638)
R5: 00000000 R4: 00000000