Open hardware start


Hi, I have been working with micro-controllers for several years and I have a basic knowledge on electronics, programming and computers. I want to know what information (text books, whitepapers, articles) did you need to design a board like BeagleBone Black from IC’s? the process of designing electronics boards for a SoC’s like AM3358 Sitara Processor is similar to the process of designing boards for microcontrollers? How much time takes to design such a board?