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am3352 tf启动出现错误



自己做的板,参照英贝特sbc8600做的。现在启动没能进入uboot,出错信息如下:

U-Boot SPL 2011.09 (Apr 10 2017 - 03:18:49)
Texas Instruments Revision detection unimplemented
Booting from MMC...
t1==
g1==
g2==
OMAP SD/MMC: 0
t2==
reading u-boot.img
spl: error reading image u-boot.img, err - -1
### ERROR ### Please RESET the board ###

ddr型号为:

AS4C256M16D3L-12BCN