I can understand your worries in this regard. We are consistently trying to improve our documentation. For now, if you face any difficulty, please feel free to create a community post and our Applications team will help you out with the sparsely documented areas.
My IoT application is being completely used the internal RAM of BCM43907. Now I require external RAM to be added to this processor to perform better. So is there any option for this processor to get connect with external RAM (like FM24V02A, etc) via CSC interface, or any other ways?