打开平台的时钟配置dts文件，位于[sdk]/lichee/linux-3.10/arch/arm/boot/dts/，文件名就是sun3iw1p1-clk.dtsi找到pllcpu，修改assigned-clock-rates为目标频率，单位是Hz。如下：clk_pll_cpu:pll_cpu{#clock-cells=<0>;compatible="allwinner,sunxi-pll-clock";lock-mode="none";assigned-clock-rates=<696000000>;clock-output-名称="pll_cpu";};
