[Pkg-raspi-maintainers] Bug#996937: Bug#996937: raspi-firmware: possibly disable cma= setting on Pi CM4 as well

[Cyril Brulebois]

(Please always keep the submitted in the loop.)

Diederik de Haas <didi.debian at cknow.org> (2022-02-15):
> On Thu, 21 Oct 2021 05:11:36 +0200 Cyril Brulebois <cyril at debamax.com> wrote:
> > Package: raspi-firmware
> > 
> > Looking at #980536, and if I'm reading between the lines correctly, the
> > whole Pi 4 family should have no cma= setting, and we should be skipping
> > it on the Compute Module 4 the same way we do on the Pi 4.
> > ...
> > This would avoid re-adding cma=$CMA (with CMA defaulting to 64M) on the
> > CM4, which the image-specs build disabled initially, when producing the
> > image with `make raspi_4_bullseye.img`.
> 
> I created https://salsa.debian.org/debian/raspi-firmware/-/merge_requests/28 to 
> have a general capability to not set CMA (f.e. for headless systems)

By the way, I still have a branch somewhere with relevant commits for the Pi 4:
  https://salsa.debian.org/debian/raspi-firmware/-/commit/e8b64797f3852e5a133d839407e36f6e9c839399
  https://salsa.debian.org/debian/raspi-firmware/-/commit/2db10902f73ca38fff08b9abb0236ac8e592a2d4

and cosmetics:
  https://salsa.debian.org/debian/raspi-firmware/-/commit/0f8b943759ed79eff2c8a0e262f92f11c1ac24b2


Slight digression: Those are part of a branch adding/fixing support for
compute modules… since the initial push, it seems the device-specific
sections in the config file (to set the right device_tree parameter)
might no longer be needed for newer releases (but I haven't checked
yet). In any cases, I'm not sure what to do for bullseye though, as I
don't think it's possible to get targeted fixes there…

TL;DR: I should extract those commits and propose them for master.
That's what I've been using successfully on top of an older release,
and that seems to be quite reliable.


Cheers,
-- 
Cyril Brulebois -- Debian Consultant @ DEBAMAX -- https://debamax.com/
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