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AM3354 从mmc1 启动时运行程序特别卡,从外部SD卡启动时运行程序很流畅

如题,自己做的板,遇到非常奇怪的问题,以前是用的NAND FLASH 没有问题,现在换成emmc后 运行qt程序特别卡,但是在外部SD卡启动就没有问题,遇到类似问题的帮忙看看啊,谢谢