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u-boot不能启动,只能打印“U-Boot SPL 2013.10 (Mar 27 2017 - 16:36:25)”这一句信息

我们先后在两家不同的PCB生产厂家做的板子,用的是同一个pcb图纸,第一家的板子u-boot可以正常运行,第二家的板子就不能正常启动,uboot只能打印“U-Boot SPL 2013.10 (Mar 27 2017 - 16:36:25)”;我想咨询一下,出现这种问题,需要怎么去找原因