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<p>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.</p>
<p>Andrey<br>
</p>
<br>
<div class="moz-cite-prefix">On 04/06/2018 04:30 AM, Christian König
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:1c6e6260-10cf-f189-45b3-74fd2d1c991c@gmail.com">
<blockquote type="cite" style="color: #000000;">I wonder if
there's no way to determine which part of VRAM is being
<br>
scanned out. If there was, we could just create a normal BO
covering
<br>
that, which would get destroyed once no CRTC references it
anymore.
<br>
</blockquote>
<br>
Unfortunately it goes further than that. The stolen VRAM is needed
for VGA emulation, not only for scanout.
<br>
<br>
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.
<br>
<br>
Christian.
</blockquote>
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