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beaglenone black 上电启动问题



一、单独通过USB接口P4 来供电系统可以正常运行

二、单独插入5V电源在P1口上,系统仅仅启动到如下信息就不动了,请问是什么问题

U-Boot SPL 2014.07-00001-g4a8e5b8-dirty (Jan 21 2016 - 17:08:47)
Using default environment

reading u-boot.img
reading u-boot.img


U-Boot 2014.07-00001-g4a8e5b8-dirty (Jan 21 2016 - 17:08:47)

I2C:   ready
DRAM:  512 MiB