The new automount feature of sdcardio added in #10129 is great for devices which host an SD card connector directly on board. This feature is currently unavailable on devices which have an SD card added on via a breakout or some other daughter board. In my case, I am using a Raspberry Pi Pico 2W with a Camera PiCowbell.

I suggest that new constants be added to settings.toml to define the pins, SPI device, and other properties used by this feature to allow it to work on devices which don't support it by default.

If it isn't possible to support this feature due to compile-time constraints and flash size, an alternative would be to add additional boards for well-supported addon boards such as the PiCowbell line. This change would definitely open the gates for many more combinations of boards and addon boards, so it wouldn't be ideal.