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现在测试发现QSPI在MLO中和APP中的clk不一样，请问在MLO中怎么修改QSPI clk
TRM手册的QSPI章节，27.3.1.4 SPI Clock Generator中有描述：
QSPI的clock是从SPI_GCLK分频而来，SPI_GCLK的频率为48MHz。
然后往下分频是根据QSPI_CLOCK_CNTRL_REG[15:0] DCLK_DIV bit field
