The Raspi foundation isn't open. Full stop. They don't share schematics. They don't share source code. They barely tell you anything about the custom chip(s) t

The Raspi foundation isn't open. Full stop. They don't share schematics. They don't share source code. They barely tell you anything about the custom chip(s) they're now putting in the raspi for GPIO and ethernet/USB. You can't buy them. Hell, they've used custom SoCs made for them by broadcom for years now, which they have exclusive access to. The only "openness" that the raspi foundation engages in is upstreaming of drivers into the mainline kernel and into mesa, which is ultimately self-serving in the end. It reduces the burden on their end of carrying patches for their kernel and ensures other linux distros also pick up some of the slack supporting their products. As for those broadcom chips? get used to it. All modern hardware of any reasonable capability has all the docs sealed behind NDAs that you have to buy a LOT of chips to even get offered. Even then you're expected to take the package deal that the silicon vendor hands you and not invent anything yourself. Chipmakers offer "full ecosystem solutions," not general-purpose parts.