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am437x 无法从emmc启动问题

Other Parts Discussed in Thread: AM4376

ricoboard am437x开发板

mmc1接4G emmc

做了2种尝试都无法从emmc启动

1.

emmc二个分区,第一个分区是fat32 (主分区,启动标志位),放MLO,u-boot.img,uEnv.txt,zImage.第二个分区ext4,放rootfs

设置mmc1启动模式,MLO阶段没有打印信息。   确定无误MLO等文件是正确的,emmc能读写

2.

将MLO 二进制数据写到emmc 中,偏移地址是0.    确定无误MLO数据是正确写到emmc 0地址处

设置mmc1启动模式,MLO阶段没有打印信息

请ti工程师给出帮助