Re: Problem with framebuffer mmap on platforms with large addressing

On Wed, 2012-03-21 at 19:45 +0000, Florian Tobias Schandinat wrote:

I finally found where we started to discuss this issue, for reference
"sm501fb.c: support mmap on PPC440SPe/PPC440EPx" back in May 2010.

The thing I don't remember is why we consider exporting the physical
address to userspace desirable (or even necessary). Fixing the generic
mmap would be trivial without breaking or adding any userspace ABI, I
think. Just adding those things to fb_info and adjusting fb_mmap
should
do the trick, shouldn't it?

For historical reasons, things like X or directfb used it. Modern X
drivers shouldn't any more, but heh...

Cheers,
Ben.