[Bug 59982] Radeon: evergreen Atombios in loop during initialization on ppc64

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=59982

--- Comment #18 from Jerome Glisse <glisse at freedesktop.org> ---
So when all register return 0xffffffff it's because something went horribly
wrong. Either the GPU memory controller is lockup or in bad or the IOMMU is
blocking things.

My guess is that enabling the crtc to start scanning trigger request to the GPU
memory controller and those request points to bad address. I would tripple
check the memory controller setup and that the crtc base register points to
valid vram inside the GPU memory address space.

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