Texas Instruments X-Loader 1.4.4ss (Sep 30 2010 - 14:44:32) Beagle xM Rev A Reading boot sector not there u-boot.bin not found or blank nand contents - attempting serial boot . . . Any clue?
Just a thought - looks like your NAND got corrupted... Can you try to boot your board holding the "USER" button? This may convince the Boot ROM to use loaders on MMC.
Worth trying, no guarantees ;-)
Cheers!
Paweł