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AM3354: AM3354有时候无法进入u-boot

Part Number: AM3354


批量生产AM3354的板子,其中有块出现了问题,从nand flash启动都很正常,但是过几天再突然上电时,串口打印到jumping to u-boot就停止了,无法进入 u-boot

后面反复断电上电都会卡在jumping to u-boot,当通过硬件改变启动方式后从sd卡启动,打印又正常了,后续再从nand flash启动也没有问题,这个不稳定的因素是啥原因