loading the kernel image through serial port

Hi,

                    I am working with AM1808 based custom made board where we don't have ethernet. So i thought of loading the kernel image and rfs through serial port. I used the following commands in uboot.

                                loadb 0xc0700000

nand erase 0x200000 0x300000

nand write.i 0xC0700000 0x200000 0x300000

                                setenv bootcmd 'nand read.e 0xc1180000 0x500000 0x500000; nboot.e 0xc0700000 0 0x200000; bootm'

here i am loading the kernel image to RAM and i copied the same to NAND address 200000. but my uboot is giving an error message as follows

NAND read: device 0 offset 0x500000, size 0x500000

                5242880 bytes read: OK

                Loading from nand0, offset 0x200000

                Image Name:   Linux-2.6.37N6

                Image Type:   ARM Linux Kernel Image (uncompressed)

                Data Size:    1984924 Bytes = 1.9 MiB

                Load Address: c0008000

                Entry Point:  c0008000

## Booting kernel from Legacy Image at c0700000 ...

Bad Header Checksum

ERROR: can't get kernel image!

Please suggest me a solution for this.

Thanks

Vasu Vallabhaneni

0xc0700000

                                nand erase 0x200000 0x300000

nand write.i 0xC0700000 0x200000 0x300000

setenv bootcmd 'nand read.e 0xc1180000 0x500000 0x500000; nboot.e 0xc0700000 0 0x200000; bootm'