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AWRL6432: Any way to adjust QSPI Flash speed?

Part Number: AWRL6432

Tool/software:

Hello team,

 Customer is asking if there is any way to adjust QSPI Flash speed during boot-up. As far as I understand, RBL loads firmware from flash so user can't control QSPI speed. Only after boot-up, customer can change QSPI speed in application, right?

Also, when I checked SBL example syscfg, I found weird symptom that clock divider is zero. How QSPI clock speed is calculated? Your help would be appreciated.

Regards,

Victor Park