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am335x用sd烧写nand时刚开始就挂了,什么原因?打印日志如下:



U-Boot SPL 2013.01.01-00123-g2830d15-dirty (Jul 01 2015 - 22:36:26)

OMAP SD/?: 0

MMC Device -2147482432 not found

spl: mmc init failed: err - -1 ### ERROR ### Please RESET the board ###