Re: [Dri-devel] Re: mach64 (Rage XL) trouble

[Kees C. <ke...@ou...>]

On Thu, May 02, 2002 at 06:34:11AM -0400, Mike A. Harris wrote:
> >mtrr: Serverworks LE detected. Write-combining disabled.
>        ^^^^^^^^^^^^^^
> Ick.  Problem #1

Yeah, I suspected as much.  This damned computer has given me quite a bit 
of trouble in the details.

Yup.

> unfortunately.  Serverworks chipsets have an off by one problem 
> in hardware with MTRR being used (if I've got the story I was 
> told by Alan Cox correct), and as such MTRR is not available as 
> it is purposefully disabled to prevent data corruption.  That 
> significantly slows down graphics.

Well, 2D works fine with the regular non-3D ati driver.

> Also... AGP on Serverworks _sucks_.  I strongly recommend against
> using Serverworks chipsets for any machines used for graphics.  
> "Server" being the operative word for the chipset.  ;o)  If they 
> were called Graphicsworks perhaps it would work better.  ;o)

So far, the machine has been great for networking, disk, and CPU speed
(dual P3s).  It was very cheap (I guess I get what a paid for).  Any
attempt to get USB or 3D working has failed.  Ugh.

> Replace the motherboard with a chipset that has a working AGP 
> implementation which both works, and is fast, and also has 
> working MTRR support.

:)  Well, 3D support is more or less a "bonus" for me.  What I really want 
to see is Xv support.  Any idea when/if that will happen for the 2D 
portion of the driver?

> Bad news..  ;o(

Well, at least there's a test for it in the kernel.  Using USB just 
hard-locks the system.  But that's for a whole different list.  ;)

Thanks for the info.  Is there any way to tell if this LE chipset happens 
to have magically fixed the off-by-1 problem?

-- 
Kees Cook                                            @outflux.net