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你好,
两个测试时候GPMC的时钟是否一样?在uboot下你是如何测试nor flash读速度的?
系统的启动包括很多部分,我建议先测量一下,然后再看那部分比较容易改善/或者时间最长,然后进行优化。你也可以参考:http://processors.wiki.ti.com/index.php/Boot_Time_Optimization。