i see, that makes a certain amount of sense, thank you. normally you can share a single spi or dual/quad spi bus between multiple peripherals with different /cs lines, but i guess that would be pretty tough to make work for instruction fetches. older chips like the 8086 had a pin to tell the memory system when it was fetching an instruction, but i haven't seen that feature in a long time, not even enabled by a fuse

you can probably use qpi that way (with both psram and flash) if you sacrifice xip and settle for loading overlays? you could even store them on qpi nand