[ThrowawayR2]

Are there any off-the-shelf hobbyist boards that expose QSPI CSn (pin 75 on the RP2350B?) and QPI_SD1-3 signals to a header or pin? Doesn't seem like the official Pico 2 or the Adafruit or Pimoroni versions of the Pico 2 expose access to these signals without modifying the board, which most people won't be able to do.

[ptorrone]

https://www.adafruit.com/product/6000 has the pads for external PSRAM you can connect to the QSPI pins there (pt @ adafruit)