Experimental: builds with dual FAT MSC support.

[Gadgetoid]

Highly experimental mass-storage supporting builds of Pico firmwares. Uses a dual device setup with one readable to the host and one readable to the device.

⚠️ Don't flash these builds on your Pico unless you've backed up and run flash_nuke.uf2! They will break your filesystem and do terrible awful things.

⚠️ I'm not sure where this PR stands now that official write-USB-drivers-in-Python support has landed, I haven't investigated how USB MSC is handled in that case, or how we might handle it here. Though it should be noted this is just a build for the curious and not anything currently slated for production use.

[alphanumeric007]

Kind of like how Circuit Python does it? I can see this ability as a bonus on devices like the Pico Lipo 16mb, or the Tiny 8mb.

[Gadgetoid]

Kind of like how Circuit Python does it?

Yes, but with none of the careful consideration the CircuitPython team put into making it work at least somewhat well, and documenting how to use it 😆

Though I don't think they make a habit of splitting the filesystem like this- it's always readable to the host and write-locked for the device by default, IIRC, and can be changed from Python if you need to write log files or something?