Initial support for bcm2838 RNG

[Kyle Evans]

On Sun, Nov 17, 2019 at 4:03 AM Mark Murray <markm at freebsd.org> wrote:
>
> Hi,
>
> > On 16 Nov 2019, at 18:59, Kyle Evans <kevans at FreeBSD.org> wrote:
> >
> > On Sat, Nov 16, 2019 at 12:48 PM Robert Crowston via freebsd-arm
> > <freebsd-arm at freebsd.org> wrote:
> >>
> >> I have made a first cut at supporting the Broadcom 2838 hardware random number generator, as found on the Raspberry Pi 4.
> >>
> >> Diff: https://github.com/freebsd/freebsd/compare/master...RobCrowston:pi4-hwrng
> >>
> >> This extends the existing bcm2835_rng.c driver to function on the Pi4. Unfortunately I do not have a Raspberry Pi 3 board to confirm it still works there, but on my Pi4, it generates (apparently) random numbers.
> >>
> >
> > Hi,
> >
> > No worries- I've got access to a Pi 3 for regression testing. Can you
> > throw what you've got into Phabricator [0] and add me as a reviewer?
> > We can iterate/review from there.
>
> Please also add markm@ and cem@ (or csprng@). You'll need one of us to OK the commit.
>

Hi, (adding cem@ to CC list)

Is there a document or something outlining what csprng@ wants to
accomplish? I definitely don't object to adding you guys on this one
(both because of the csprng@ origin story and this touches just enough
actual RNG code path to warrant it, at a glance), but going forward-
is csprng@ wanting to audit pre-existing stuff as it gets touched in
any way (e.g. existing driver, just adding compatibility bits to make
it probe/attach on new board), or just any new code actually affecting
RNG?

Thanks,

Kyle Evans