On 07/04/2019 02:40, Theo wrote:
> Lew Pitcher  wrote:
>> Gareth's was W7 now W10 Downstairs Computer wrote:
>>
>>> One part of the GPU must be simply concerned with taking the frame
>>> buffer and emitting it as a composite video stream, so I wonder how
>>> the aspect ratio is set up?
>>
>> I'm not familiar with the internals of the VideoCore GPU, so I can't answer
>> this question.
>
> Display sizes are communicated to the GPU via the mailbox property
> interface, or the mailbox framebuffer interface:
>
> https://github.com/raspberrypi/firmware/wiki/Mailbox-framebuffer-interface
> https://github.com/raspberrypi/firmware/wiki/Mailbox-property-interface
>
> I'm not sure if the GPU-side registers for changing output video timing
> (rather than just resolution) are exposed to the ARM.

Interesting.

Thankyou.

Bookmarked

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