You wrote (in your message from Sunday, March 7)
 > > For XFree86 4.0, we really need to be able to have the X server request
 > > specific MTRR settings for different parts of a video card's physical
 > > memory address space.  While turning WC on for the framebuffer is a big
 > > performance boost, a more critical issue is being able to make sure that
 > > WC is turned off for areas that are used for memory mapped I/O.  We've
 > > found that some BIOSs enable WC in areas that our drivers want to use
 > > for MMIO.  One example is the 0xb0000-0xbffff range.
 > 
 > We currently do not have such an interface in NetBSD. It is not hard
 > to add, the mtrr code itself is small, and you just need to create
 > an interface for it, either an i386 specific system call or a kind
 > of "cpuctl" device.
 > 
 > However, I don't think anybody is doing this at the moment, so I don't think
 > we'll have this in the next release, unfortunately. If anyone wants to
 > do such a thing, get in touch with me, though.

I've finally ported the FreeBSD code to NetBSD, in the form of a new
version of the XFree86 aperture driver LKM for NetBSD, which supports the
same ioctl interface than FreeBSD (and OpenBSD, BTW) on /dev/xf86. 

The new aperture driver will be included into the next XFree86 3.9.17
snapshot together with support for it in the X server. I've also put
it on: <ftp://ftp.laas.fr/pub/ii/matthieu/NetBSD/apNetBSD.shar>.

If someone chooses to integrate this (the MTRR support part) into the
main NetBSD tree, I'd be happy to adapt the XFree86 code if needed. 

Regards,
-- 
					Matthieu