[yocto] [meta-raspberrypi][PATCH 5/8] Support for vc4 graphics driver: upgrade 4.4 kernel to 4.4.10

[Herve Jourdain]

Hi Andreas,

I will send a v2 series soon, that will include something very similar to your suggestion for the overlay parameter.

Herve

-----Original Message-----
From: Andreas Müller [mailto:schnitzeltony at googlemail.com] 
Sent: mercredi 18 mai 2016 23:47
To: Herve Jourdain <herve.jourdain at neuf.fr>
Cc: Khem Raj <raj.khem at gmail.com>; Yocto Project <yocto at yoctoproject.org>
Subject: Re: [yocto] [meta-raspberrypi][PATCH 5/8] Support for vc4 graphics driver: upgrade 4.4 kernel to 4.4.10

On Wed, May 18, 2016 at 7:32 PM, Herve Jourdain <herve.jourdain at neuf.fr> wrote:
> One thing I didn't make configurable, but that maybe could be, is the parameter passed to the overlay.
> I selected cma-256, based on experience from other people, and because my configuration is RPI2/3 with 1G of memory.
> I realize it might not work well with RPI0/1, which have less memory available...
> So even if I believe cma-256 is a good default value, it might be made selectable by the user, if we want to consider vc4 on RPI0/1.
I played around with vc4 to but did not manage to get it work for an elder version 4.1 of kernel.

I did in rpi-config:

CMA_SIZE = "cma-256"
CMA_SIZE_raspberrypi = "cma-64"
CMA_SIZE_raspberrypi0 = "cma-128"
...
echo "dtoverlay=vc4-kms-v3d-overlay,${CMA_SIZE}"
>>${DEPLOYDIR}/bcm2835-bootfiles/config.txt

This is nothing but an untested suggestion.

Without testing your series I would be very happy to see this or very similar applied in master: Since vc4 works, RaspberryPi turned into my reference test board - e.g. have not seen kde5 running that nice on another board..

Andreas