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最新版本的SDK2.0 uboot 2015.7 编译运行串口没有反应?



安装了最新版的SDK2.0  编译 uboot 2015.7 把MLO uboot.img 文件COPY 到SD卡启动,串口直接没有输出?

换成2014版本的uboot 就没问题。请问下这个是啥问题呢?感觉好像SPL失败了·。。但不知道为什么?