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TI 8168 SD启动问题



当拿到贵司8168 EVM板(型号:16x/389x EVM ASSY 512870 REV B S/N NEB_1012007),然后按照QSG中设置SD启动模式,串口没有任何输出,后来发现原来SD是空的,然后我按照TI81XX_PSP_U-Boot.pdf中的第26页制作SD步骤,制作了SD卡,但是试了很多次,串口依然没有任何输出,再启动模式设置为NAND SPI NOR启动,串口依然没有任何输出,请问这是为什么?该如何解决??谢谢!