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I have an external SPI NOR flash device wired to the HS SPI bus interface (Flexcomm 14) on a RT685s. I want to boot from this flash device; however, I've read that the only master boot options are a FlexSPI boot, SD boot, and eMMC boot. Is it possible to boot from this external flash using the high-speed SPI bus (Flexcomm 14)? If so, what are the requirements/setup steps I must follow to execute this?
Here below is some application notes for reference for NOR boot
AN12751 How to Enable Recovery Boot from QSPI Flash
AN12773 How to Enable Master Boot from Serial NOR Flash
Hi @lgibarra9,
It is not possible to boot from an external SPI NOR Flash using the High-Speed SPI bus from FC14. This bus can be used (besides run-time SPI communication) to download an image when the MCU is in ISP mode. But for normal boot operation from an external flash, the High-Speed SPI bus is not an option, so your SPI NOR flash should instead be connected to the FlexSPI bus.
BR,
Edwin.