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8168加载完UBOOT成功后,串口无打印信息



大家好,我用的合众达的开发板,用JTAG通过CCSv5烧写uboot到NAND,就是u-boot_dvr.bin,提示成功。把板卡的启动方式设置为NAND,之后连接串口后无任何反应,请问这是什么原因呢?

还有开发板提供的SDK包里面

上面这些都是什么文件啊?