@Schischu
This is very important information, and exactly the kind I hoped to elicit when I started this thread. It also means that my approach so far (copying the existing environment and then adapting it to the particulars of these receivers) will not work as support and drivers at the basic level do not exist (yet) in some cases, at least they are not provided by STM. Developing them myself is beyond my means and knowledge.
In essence, in order to port E2 tot these receivers more inside information is needed. Hopefully somebody can provide this.
For the time being I will put this project to rest. Everybody is of course free to use the git, I will leave it available, but it will be static in at least the near future.
Regards,
Audioniek.
Regards