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DM368 EVN板SD卡的作用是什么?

您好

请问DM368 EVN板SD卡的作用是什么?我把ubl和uboot烧写到nandflash里面,而且我已经Select Switch SW4 for the NAND boot mode and 8-bit AEMIFconfiguration ,但是还得插SD卡才能启动。这是为什么?不懂SD卡里面的boot.scr和uimage的作用是什么?