I believe there is some information that discuss about spi in include/drivers/spiffydriver.h and doc/API within the sdk. Check it out.
I also looked spiffydriver.h.
As far as I understood, it is not related with minidriver, but for application usage.
Do you mean that the spiffydriver.h also has the control part for minidriver?
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Serial flash for app/NV storage has to be on SPI1. It is not possible to use SPI2 for NV storage.
Thank you for the answer.