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How to change the SPI master boot clock rate?

Category: Software
Product Number: ADSP21565
Software Version: CCES2.10.0

Hi,

21565 in my PCB is SPI boot from ext SPI flash. Sometimes it can boot and run program, sometimes it boot failed.

I can't find anything error in hardware. So I want to try to set the SPI clock rate slower, how can I set it?