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请教 AM3358 如何在SPL阶段将串口打印提前,该修改哪些地方?

Other Parts Discussed in Thread: AM3358

我使用的的处理器是AM3358,SDK是Processor SDK Linux 06。在SPL阶段会进行初始化串口,DDR等等,但是目前我编译出来的固件没有任何输出信息,因为是新设计的硬件,所以我向将串口打印提前,通过打印的方式,看系统运行到哪个地方来排查问题。在此请教各位,谢谢你们!