All Application notes on Raspberry Pi, Arduino , SDR, Freesoc2 available now on github. It is often found that users want to easily access the bulk of the materials that we generated as part of interacting with customers. Often most of them are common pitfalls or procedures one would want to learn from.
Based on many years of support we gained some material and we are making efforts to see if we can bring them all but rest assured at some day we will truly stick to openness and make them all available.
For any queries you may have you could send an email to firstname.lastname@example.org