Quad SPI XIP is pretty common these days. Plenty of modern MCUs bundle it as an option, some like this one (but also some Toshiba part, to name one) use it as t

Quad SPI XIP is pretty common these days. Plenty of modern MCUs bundle it as an option, some like this one (but also some Toshiba part, to name one) use it as the only option. It's workable, and you can put performance-critical code in RAM anyways. That is, if you have enough RAM...