i had used two type cable follow:
1. http://d-il.com/home/store/mini-usb-cables/
2. http://www.toshibadirect.com/td/b2c/adet.to?seg=HHO&poid=438342&src=ASEM&cm_mmc=sf_Nextag-
But i have never boot into fastboot on Pandaboard
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Best Regards.
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             HCMC,  July 04th , 2012