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dm355 UART启动问题



之前查看dm355时发现,若选择NAND启动,则GIO000必须接高电平,Active low during MMC/SD boot

在画PCB板的时候,GIO管脚没有引出来,处于悬空状态,

因此尝试采用UART boot模式,成功烧写UBL和UBOOT到nand,板子还是无法启动,串口一直输出bootme,请问该如何解决?