Not a ready drop-in replacement yet, but running ARM code with access to the SD card and the UART console is possible!
edit: By the way! The Pi loads all the firmware from the SD card — no reflashable memory on the board AFAIK – which would make it excellent from the "State considered harmful" perspective http://blog.invisiblethings.org/2015/12/23/state_harmful.htm...
Not a ready drop-in replacement yet, but running ARM code with access to the SD card and the UART console is possible!
edit: By the way! The Pi loads all the firmware from the SD card — no reflashable memory on the board AFAIK – which would make it excellent from the "State considered harmful" perspective http://blog.invisiblethings.org/2015/12/23/state_harmful.htm...