That's always the problem with these non-Pi SBCs. They never have good software support.
Olimex does provide both open source hardware and open source software for example: https://www.olimex.com/Products/OLinuXino/STMP1/STMP157-OLin...
Even bigger brands such as Nvidia seem to expect us to recycle SBCs every couple years.
The NanoPi models from FriendlyElec tend to have better support.
Olimex does provide both open source hardware and open source software for example: https://www.olimex.com/Products/OLinuXino/STMP1/STMP157-OLin...