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C6670 boot SPI 时钟配置

硬件板是自己开发的,板子上没有EEPROM,bootmode是SPI boot。目前发现一个问题,由于文件比较大,boot的花费时间很长大概有26s左右。示波器测出SPI的clock 是624k左右,请问怎么把SPI的时钟频率提高上去?谢谢啊