On Sat, 19 Dec 2020 16:58:30 -0000 (UTC)
bob prohaska  wrote:

> I'm getting the impression that u-boot starts a considerable amount of
> activity on the GPU. Does it simply go away once an introduced kernel is
> started? Later on in the tutorial it's clear that bluetooth requires
> its own software, which doesn't appear to be open source.
>
> So, just how "bare" is bare metal on the Pi?

 AIUI the GPU is really in control of the hardware, all the code
that runs on the GPU is closed source binary blobs and there's quite a lot
of it.

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