[RFC 4/4] drm: Add NVIDIA Tegra support
alan at lxorguk.ukuu.org.uk
Wed Apr 11 07:52:37 PDT 2012
> Maybe your question is answered by my reply to Alan's comment. The mapping
> is actually done to get a linear view for the display controller which
> doesn't support SG transfers. The kernel and user-space already have virtual
> linear buffers.
The framebuffer currently needs a physically contiguous map for the
console devices. Well you could vmap them but that is pretty hideous on a
32bit platform with 32bit 1080p display plugged into it!
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