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Doesn't the UEFI firmware map a GPU framebuffer into the main address space "for free" so you can easily poke raw pixels over the bus? Then again the UEFI FB is only single-buffered, so if you rely on that in lieu of full-fat GPU drivers then you'd probably want to layer some CPU framebuffers on top anyway.




Yes if you have UEFI.

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well, if you poke framebuffer pixels directly you might as well do scanline racing.

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Alas, I don't think UEFI exposes vblank/hblank interrupts so you'd just have to YOLO the timing.

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