[PATCH 1/2] drm/amdgpu/gmc: always steal the first 32MB of vram for fw hand-over

Christian König ckoenig.leichtzumerken at gmail.com
Fri Apr 6 12:26:22 UTC 2018

I feared that you would say that :(

In this case the patches are Acked-by: Christian König 
<christian.koenig at amd.com>.


Am 06.04.2018 um 13:23 schrieb Andrey Grodzovsky:
> Me and Alex talked to a BIOS guys yesterday exactly about that, a 
> dynamic way to query this info from BIOS, he just told us to reserve 
> 32M to cover 4K display.
> Andrey
> On 04/06/2018 04:30 AM, Christian König wrote:
>>> I wonder if there's no way to determine which part of VRAM is being
>>> scanned out. If there was, we could just create a normal BO covering
>>> that, which would get destroyed once no CRTC references it anymore.
>> Unfortunately it goes further than that. The stolen VRAM is needed 
>> for VGA emulation, not only for scanout.
>> But yes I agree that we somehow figure that value out from the BIOS. 
>> If I'm not completely mistaken I've also seen some atombios table 
>> with that info in some discussion.
>> Christian. 
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