[yocto] [meta-raspberrypi][PATCH v2 4/4] README: Add a section about graphic stacks

[Javier Martinez Canillas]

Hello Andrei,

On 10/21/2015 02:32 PM, Andrei Gherzan wrote:
> Hello Javier,
> 
> On Mon, Aug 24, 2015 at 10:25:30PM +0200, Javier Martinez Canillas wrote:
>> Hello,
>>
>> On 08/17/2015 11:58 AM, Javier Martinez Canillas wrote:
>>> On 08/17/2015 09:57 AM, Andrei Gherzan wrote:
>>>> On Thursday, August 13, 2015, Khem Raj <raj.khem at gmail.com> wrote:
>>
>> [snip]
>>
>>>>>>
>>>>>> +2.O. Graphic stacks
>>>>>> +===================
>>>>>> +The Raspberry Pi boards can use one of two graphics stacks: The userland
>>>>>> +user-space driver or the vc4 DRM/KMS kernel driver. By default userland
>>>>>> +is used since the vc4 is still experimental. But this can be changed by
>>>>>> +modifying the defaults for the kernel, egl, gles2, libgl and mesa
>>>>> providers.
>>>>>> +This is explained in the conf/machine/include/rpi-default-providers.inc
>>>>> file.
>>>>>> +
>>>>>
>>>>> you may want to add pointer to the commented out code that you have added
>>>>> to select them
>>>>> in rpi-default-providers.inc
>>>>>
>>>>
>>>> It would be nice to have some detailed info on what and where to comment
>>>> out the configuration.
>>>>
>>>
>>> On patch 3/4 I added that documentation to rpi-default-providers but didn't
>>> add it to the README and instead pointed out to rpi-default-providers to
>>> have a level of indirection in case the providers change and to not have
>>> duplicated information but I will add it to the README as well.
>>>
>>> Do you have comments on the other patches in the series so I can address
>>> all of them before re-spinning?
>>>
>>
> 
> Really sorry on this late reply. So my only recommendation is to move things

No worries, I've also been very busy with other stuff.

> you wrote in 3/4 in the 4/4 (README). Basically you would describe what a user
> needs to overwrite as providers in order to use VC4 as graphics stack.
>

Ok, I'm traveling to Korea next week for KLF and KS so I'll probably resend
a v3 (addressing your suggestions) later next week when I'm back.
 
> As well, how do you handle the devicetrees for 4.1? Aren't changed in 4+?
>

For now, I'm defining a KERNEL_DEVICETREE in my conf/local.conf file since
that is what was agreed with Petter Mabäcker on v1 of this series [0 and
I also mentioned in the cover letter [1].

But the new device tree overlay dir layout is not only for 4+ but also it
is used in the latest version of the older branches. So once all recipes'
SRCREV are bumped, overwriting the variable won't be necessary anymore.

>> Gentle ping about this. Thanks!
>>
>> Best regards,
>> --
>> Javier Martinez Canillas
>> Open Source Group
>> Samsung Research America
> 
> --
> Andrei Gherzan
> 

[0]: https://lists.yoctoproject.org/pipermail/yocto/2015-August/025961.html
[1]: https://lists.yoctoproject.org/pipermail/yocto/2015-August/026151.html

Best regards,
-- 
Javier Martinez Canillas
Open Source Group
Samsung Research America