Awesome. Thank goodness the R9 280 series are based on a known GPU!
Now maybe someone can tweak the firmware for the R9 290X to work on a Mac Pro. The hardware seems an evolution, rather than a radical departure, so perhaps editing for the frame buffer and ports is enough to get some functionality working? Or a kind soul inside Apple or AMD could leak some source code...
I have seen boot screens.
But keep in mind there is no frame buffer in 8000 controller other than the 6 mdl one.
So no framebuffer to assign. So likely that rom will never behave the way we have come to expect.
But maybe time for a different sort of boot screen card.