After bruising myself on the raw gcc toolchain - and although I got a program running - I think I want my toolchain to do more of the hard work for me!

So next I tried yotta, the software module system used by mbed OS. Building a simple program using the Official Yotta target for OSHChip and gcc on MacOSX proved quite straight-forward.

As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub.