紧急求教:AM335X新板子,SD卡启动在reading u-boot.img不动了

紧急求教:AM335X板子,SD卡启动在reading u-boot.img不动了

U-Boot SPL 2011.09-svn1 (Jun 05 2015 - 17:18:08)
Texas Instruments Revision detection unimplemented
Booting from MMC...
OMAP SD/MMC: 0
reading u-boot.img

不知道是什么问题,能提示一下吗?

感谢感谢!