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pandaboard boot fails.



hi all

 i get a pandaboard es on my hand.  it worked fine until yesterday.  it can not boot, here is what displays by serial port:

U-Boot SPL 2011.12 (Apr 02 2012 - 18:13:04)
Texas Instruments OMAP4460 ES1.1
OMAP SD/MMC: 0
mmc_send_cmd: timedout waiting for cmddis!
** Can't read from device 0 **
spl: fat register err - -1
### ERROR ### Please RESET the board ###

 

it seems that something wrong with reading sd card. i did not change any hardware structure i promise.

can anyone  tell me how to solve it?

thanks.