Since my main interest is FPV, and I use an OSD, I was interested originally to make a vector graphics replacement for MinimOSD. Here is the original diydrones discussion . Though that worked well, I next decided to incorporate the Ardupilot code into the OSD so it is all integrated on the same IC. The software and hardware is all Open Source. The Project is also different in using FreeRTOS rather than Nuttx or Posix The source code is available on github
Above is the initial version.
Currently I am designing a dedicated OSHW board for the project