am5728从sd卡启动不了,上电复位后,先后给SD卡发送CMD0,CMD8,CMD55,CMD41,CMD55,CMD41,CMD2,CMD3,CMD9,CMD4后,时钟和cmd信号都开始变的无序和混乱,
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user6132152 说:am5728从sd卡启动不了
请问是自制的开发板吗?启动不起来的log信息可否贴出来一下?
user6132152 说:上电复位后,先后给SD卡发送CMD0,CMD8,CMD55,CMD41,CMD55,CMD41,CMD2,CMD3,CMD9,CMD4后,时钟和cmd信号都开始变的无序和混乱,
这边是在测试SD读写就有问题?有没有换一张卡试试?另外参考EVM板检查一下硬件设计是否有问题。
几个问题需要核实一下:
1,仿真器能连上吗?BOOTMODE寄存器是SD启动吗?
2,其他启动方式可以工作吗?
3,SD卡原理图和EVM有什么区别?
4,有没有可能是SD卡bootloader已经启动了?只是还没跑到串口初始化就挂掉了?(因为硬件和EVM有修改,或者DDR不稳定等原因)