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The firmware is not open source, that's entirely untrue. There is nothing open source about the firmware on peripherals or the firmware on the SoC. The only thing that's open source is the late boot chain and OS. It would be nice if people would stop spreading dishonest claims.
Not only that, but they've gone out of their way to turn the proprietary firmware into a black box that's much harder to inspect than other devices and cannot receive crucial security updates. They've taken the opposite path of opening it up, but rather have made it more closed.
The reason for that is their attempt at gaming / manipulating the FSF RYF standard, since it considers proprietary firmware fine as long as it's not possible to update it, which is incredibly stupid. It's crucial to provide full security updates and they've prevented doing that.
specifically, the proprietary firmware must only be accessible by a secondary processor — so it is not even possible to inspect it from the main processor
There is a whole bunch of proprietary firmware / microcode running on the SoC too. It's a proprietary ARM SoC, so I'm not sure what people expect. Anything with an ARM SoC is proprietary to the core, and the other hardware like Wi-Fi, Bluetooth, cellular, and a lot more is too.
I'd like for people to point to one hardware component inside it with open hardware or firmware. A board schematic with a bunch of proprietary black boxes on it isn't meaningfully open hardware and I'm curious if people can even link to one, since I don't see anything at all.
of course, but you'd expect the FSF to want to maximise freedom and allow you to inspect as much firmware as possible rather than taking the "see no evil" approach
and by "expect the FSF" i mean a hypothetical Foundation that actually tries to further freedom rather than religiously adhere to very specific and poorly designed tenets