devkit8000 booting from flash problem

hi all,
i reflashed the devkit8000 as given in the usermanual .. but later
when i try to boot from flash it is failed to boot emitting the below
error.

Texas Instruments X-Loader 1.41
Starting OS Bootloader...

U-Boot 1.3.3-svn (Feb 4 2010 - 15:16:04)

OMAP3530-GP rev 2, CPU-OPP2 L3-165MHz
OMAP3 DevKit8000 Board + LPDDR/NAND
DRAM: 256 MB
NAND: 256 MiB
Using default environment

In: serial
Out: serial
Err: serial
Hit any key to stop autoboot: 0

NAND read: device 0 offset 0x280000, size 0x240000
Error: Bad compare! failed
nand_read_ecc: Failed ECC read, page 0x00000500
Error: Bad compare! failed
nand_read_ecc: Failed ECC read, page 0x00000500
reading NAND page at offset 0x280000 failed
2359296 bytes read: ERROR
Wrong Image Format for bootm command
ERROR: can't get kernel image!
OMAP3 DevKit8000 #

any ideas?? pls help