Re: [RFC 4/4] drm: Add NVIDIA Tegra support

* Alan Cox wrote:

quoted

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!

Heh, vmap() is exactly what I do. =) Would you mind explaining why exactly it
is hideous?

I'll have to investigate what an appropriate alternative would look like.

Thierry