[Bug 102322] System crashes after "[drm] IP block:gmc_v8_0 is hung!" / [drm] IP block:sdma_v3_0 is hung!

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=102322

--- Comment #16 from Alex Deucher <alexdeucher at gmail.com> ---
(In reply to Andrey Grodzovsky from comment #15)
> I think it just means systems with large VRAM so it will require large BAR
> for mapping. But I am not sure on that point.

That's correct.  the updates are done with the CPU rather than the GPU (SDMA). 
The default BAR size on most systems is usually 256MB for 32 bit compatibility
so the window for CPU access to vram (where the page tables live) is limited.

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