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beagleboard x15 SD卡无法启动

Other Parts Discussed in Thread: AM5729, AM5728, BEAGLEBOARD-X15

各位大神:

我的beagleboard x15 ,插入SD卡时,无法从SD卡启动,UART不输出任何信息。拔掉SD卡,可以从EMMC启动。

SD卡的启动制作是按照教程 software-dl.ti.com/.../Overview.html

另外我发现,我的beagleboard x15 上面的CPU是AM5729。

请各位大神赐教,怎么解决。