Re: Hmm... Raspberry Pi
The design is meant to be as Open source (SW & HW) as feasible. It's basically a now obsolete ARM phone chip on a breakout board. Any complete non-trivial computer design, even if open source is going to have some (or mostly) proprietary chips. Probably the USB/Ethernet chip is proprietary. Fully documented so you can write drivers from scratch is the issue. Almost all chips are proprietary.