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1 ：C6678 网口时钟频率怎么求？
2 ：我怎么可以得知我的开发板如果要从网络引导启动起来需要的时钟频率。
参考sprugy5 keystone bootloader 3.3节 EMAC boot，外围输入时钟必须是156.25,250或者312.5，然后指定倍频到1.25G
