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AM3352复位的问题

启动方式是SPI falsh 

在UBOOT环境下按手动复位(置WARMRSTn为低),或者输入reset指令,UBOOT可以正常重启;

加载内核以后按手动复位,或者登陆系统以后输入reboot指令,系统不能正常启动,串口无打印信息,必须断电才能重新启动。

请问大概的原因是什么?