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

[Khem Raj]

On Thu, May 19, 2016 at 8:11 AM, Andrei Gherzan <andrei at gherzan.ro> wrote:
> On Wed, May 18, 2016 at 11:46:39PM +0200, Andreas Müller wrote:
>> 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"


>
> I sent reply about this too. This is definitely one solution would I
> would rather have a CMA_SIZE default value and a python function to
> check its match with board variant. Cause in this way a user might be
> able to use cma-96 on rapsberrypi.
>
>> CMA_SIZE_raspberrypi0 = "cma-128"


setting CMA_SIZE should be moved into machine.conf file IMO


>> ...
>> 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
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> --
> Andrei Gherzan
>
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