This is one of the tricks to enable using both QSPI slots for PSRAM instead of the typical FLASH+PSRAM. This is great for making audio modules, where the firmw

This is one of the tricks to enable using both QSPI slots for PSRAM instead of the typical FLASH+PSRAM. This is great for making audio modules, where the firmware is be small and operates on a big audio buffer. Since the biggest available PSRAM chips are 8MB, this combined 16 MB could hold around 3 minutes of mono 16-bit audio, which allows for a very nice multi track looper. Another way (in case there's no other MCU to help with uart bootstrap) would be to add a logic chip to multiplex the CS line between Flash and the first PSRAM - copy firmware to flash and then switch to using ram.