[Linux-fbdev-devel] [PATCH 1/3] radeonfb: Fix 64 bits resources on 32 bits archs

[David Miller]

From: Michel Dänzer <michel at tungstengraphics.com>
Date: Wed, 23 Apr 2008 11:32:07 +0200

> On Wed, 2008-04-23 at 08:21 +1000, Benjamin Herrenschmidt wrote:
> > On Tue, 2008-04-22 at 17:55 +0200, Christian Ehrhardt wrote:
> > > I wanted to ask if there are any known workarounds atm that would
> > > allow me to use my X11 for now?
> > 
> > X is doing a mmap of /dev/mem instead of /dev/fb ?
> > 
> > You can normally map the fb mapping /dev/fb and then map the registers
> > using /dev/fb at an offset beyond the framebuffer (fix->smem_len).
> > 
> > If X is using /dev/mem instead, then it's being stupid and needs to be
> > fixed...
> 
> It's up to the driver, and again, the current radeon driver doesn't use
> radeonfb at all anymore...

The only portable thing is for X to use the PCI sysfs mmap() stuff,
which current Xorg servers using libpciaccess do.

I know because I'm typing this from a sparc64 using a Radeon
with current Xorg :-)