This is a work-in-progress.
Similar to the S2 Kaluga board, this provides the basic support for
showing pixels on the screen of the S3 Box. There is no support for
touch input yet, or any of the button peripherals. There is also a bug
somewhere that causes the printerdemo_mcu to raise an uncaught
exception. Only a content-reduced version of the printer demo shows on
the screen.
