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问题如题，客户反映有时候上电程序没有启动。拿回公司后上电发现只显示了U-Boot SPL 2013.01.01 (Sep 26 2016 - 14:05:16)这一句，然后就没有信息打印出来，屏幕也没有亮，linux内核也都没有启动
请问使用什么启动模式？
