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AM5716: SD卡启动失败

Part Number: AM5716
Other Parts Discussed in Thread: TPS65916, , TMDXIDK5718, AM5718

我采用AM5716做了一块PCB,PMIC采用TPS65916(驱动文件用TPS65917)。目前做从SD卡启动后,显示一些错误,比如unable to read file boot.scr;unable to read file uEnv.txt;Card did not respond to voltage select!等。请问这会是什么原因导致的呢?无法启动是否跟这个信息有关。另外,测到ddr频率只有几百kHz。后面就没了。第一次使用该芯片,希望能够得到一些调试方向。