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Error: Bad compare! failed- on omap3530 Beagle board

Dear All,

TargetBoard : Beagle Board C5

I built new  MLO and flash into Nand by SD card,

then push reset, I get  "Error: Bad compare! failed" message.

But now i can not recover old MLO and u-boot,

because when i insert SD card ,and push user button and reset button,

the board can not boot from the SD card of MLO and u-boot ...and always show the same error log 

what can i do now? thanks.

U-Boot SPL 2012.07 (Sep 25 2012 - 17:22:52)
Texas Instruments Revision detection unimplemented
Error: Bad compare! failed
Error: Bad compare! failed
... 
Error: Bad compare! failed
Error: Bad compare! failed

Error: Bad compare! failed
Error: Bad compare! failed
Error: Bad compare! failed
mkimage signature not found - ih_magic = ea000014
Error: Bad compare! failed
Error: Bad compare! failed
Error: Bad compare! failed
Error: Bad compare! failed
Error: Bad compare! failed

...

with Best Regards,

Plus Huang.