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am3352bzcz80和am3352bzcz100主频分别设置720M和1G，为了统一MLO和u-boot.img，需要在uboot源码里做一个判断，根据芯片设置不同的主频，请问在uboot源码中如何获得它们的唯一标志作为判断？
SDK06的Uboot代码里面已经加上了芯片版本和主频的判断，通过读取芯片内部寄存器来调整主频和电压电流。
