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am335x MPUPLL问题



我买了一块开发板,处理器主频是800的,我在移植uboot的2014.1版,看了原来的boot的MPUPLL_M参数后选的是MPUPLL_M_720,为什么不使用MPUPLL_M_800?这个的选择和什么有关系?是主频800的处理器,800以下的频率都可以使用吗?这个选择后像所有接口的频率都要重新修改吗?