I am not sure what your goals are but I would suggest first skimming through the documents on https://www.parallella.org/board/ https://www.parallella.org/board

I am not sure what your goals are but I would suggest first skimming through the documents on https://www.parallella.org/board/ https://www.parallella.org/board/ . e.g. within the first few pages of "Parallella Reference Manual" there is a picture that shows all the parts which might have alleviated the "ARM A9" vs RISC confusion.