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AM3359 uboot

Other Parts Discussed in Thread: AM3359

您好!最近我司参照AM3359 EVM开发了2个项目,3359配置部分电路基本和3359 Baseboard一样,Uboot部分也是参照Baseboard配置从SD卡启动,但是目前AM3359所有晶体都已起振,PRZO等PIN脚电压也和Baseboard一样,但是无法从SD启动,SD clk信号没有。测试开发板的Baseboard,不连接GP板和LCD板所有PIN基本和目前我们板一样,也无法从SD uboot.请问,如果不连接GP 板和LCD板,要如何修改,才能使单独的Baseboard 从SD卡可以boot启动??