ATI video questions again

[andi payn]

I already asked some of this before, so I apologize. If anyone here
doesn't know the answers, but does know where I should go to ask, that
would be just as helpful.

I have a Mach64 video card (a 3D Rage IIc rev 7a), and I can't get Xv or
DRI to work under FreeBSD. I'm using the XFree86-Server-4.3.0_11 port
under FreeBSD 5.1. With the XFree86 4.3 packages from Mandrake 9.2, Xv
and DRI work fine.

Looking at my XFree86.0.logs, I've seen three different things that
might indicate the problem, but I don't know which it is, or where to go
from here.

First, after loading ati_drv.o, whhen it tries to initialize the driver,
it goes through the R128 and RADEON drivers only--no Rage/Mach64. Maybe
this is the problem? Is FreeBSD's XFree86-Server port missing/disabling
the ati.2 drivers? (And yet I see the message "For information on using
the multimedia capabilities of this adapter, please see
http://gatos.sf.net.", which I think came along with the ati.2 driver?)

Second, when initializing the driver "atimisc_drv.o", I get the
following messages in FreeBSD:
> (==) ATI(0): Write-combining range (0xa0000,0x20000) was already clear
> (==) ATI(0): Write-combining range (0xc0000,0x40000) was already clear
> (II) ATI(0): Primary V_BIOS segment is: 0xc000
> (==) ATI(0): Write-combining range (0x0,0x1000) was already clear

I get no such messages under linux. However, when I first upgraded to
2.4.22, I got the following messages (and no Xv or DRI, and X slowed to
a crawl, too)--which went away (along with the problems) when I fixed
the broken ServerWorks code in the kernel:
> (==) ATI(0): Failed to set up write-combining range (0xa0000,0x20000)
> (==) ATI(0): Failed to set up write-combining range (0xc0000,0x40000)

So, maybe there's a similar problem in FreeBSD causing similar issues?

Third, when initializing the vbe sub module, I see this:
> (II) ATI(0): VESA VBE DDC supported
> (II) ATI(0): VESA VBE DDC Level none
> (II) ATI(0): VESA VBE DDC transfer in appr. 2 sec.
> (II) ATI(0): VESA VBE DDC read failed
> (==) ATI(0): Write-combining range (0x0,0x1000) was already clear
> (==) ATI(0): Write-combining range (0xa0000,0x10000) was already clear
> (==) ATI(0): Write-combining range (0xfe101000,0x1000) was already
clear

Something is obviously wrong here. Besides the write-combining stuff
appearing again (and again, in sub module "fb"), there's that VBE DDC
error (and the fact that all of the results are missing, of course).

The equivalent in linux is:
> (II) ATI(0): VESA VBE DDC supported
> (II) ATI(0): VESA VBE DDC Level 2
> (II) ATI(0): VESA VBE DDC transfer in appr. 2 sec.
> (II) ATI(0): VESA VBE DDC read successfully
> (II) ATI(0): Manufacturer: OQI  Model: 4a32  Serial#: 1097
> ...

I have no idea where to go from here (short of tramping through
megabytes of XF86 code...). Can anyone help?

Thanks.