Re: [Linux-fbdev-devel] Re: [Dri-devel] Rage128 and Radeon patches

[Steven Newbury <dri.devel@ntlworld.com>]

On Thu, 2003-08-14 at 19:06, Alex Deucher wrote:
> I haven't tried multiple radeon cards, but I seem to recall several
> people having this problem right around when 4.3.0 was released.  I
> don't think a "proper" fix ever went in and I think the issue was to be
> revisited later.  I don't know if it's needed anymore or not.
> 
It is still needed, Radeon as a secondary display only works on the
first initialisation (it can not find ROM on subsequent attempts) in all
XFree86 versions I have tried up to and including current CVS.  At least
on my hardware... :-/

> Alex
> 
> --- Jon Smirl <jonsmirl@yahoo.com> wrote:
> > --- Alex Deucher <agd5f@yahoo.com> wrote:
> > > > 2) access ROM directly instead of relying on copy
> > > > in low RAM. This allows multiple cards. Required
> > > > MPP_TB_CONFIG fix in driver.
> > > 
> > > Is this patch necessary for xfree86?  It may address
> > > some of the issues
> > > in the email threads I sent out yesterday (ie,
> > > problems with multiple
> > > radeon cards and xfree86).  if so would you consider
> > > making one?
> > > 
> > 
> > Xfree code does not have the patch, but is Xfree
> > experiencing the bug? Xfree accesses the hardware very
> > differently than the framebuffer drivers.
> > 
> > I suspect that you would see this problem if you were
> > using something else for your primary video and a
> > Radeon for secondary. The first time you ran Xfree it
> > would work. But when you exited and restarted Xfree it
> > would hang when starting the secondary display.
> > 
> > Where does XFree reset the secondary card? The code
> > below needs to run right after the reset in the radeon
> > driver. I added it to my Rage128 driver too but I have
> > not observed the problem with them.
> > 
> > Framebuffer code is different and triggers the bug the
> > first time the secondary display is accessed.
> > 
> > /* Fix from ATI for problem with Radeon hardware not
> > leaving ROM enabled */
> > unsigned int temp;
> > temp = INREG(RADEON_MPP_TB_CONFIG);
> > temp &= 0x00ffffffu;
> > temp |= 0x04 << 24;
> > OUTREG(RADEON_MPP_TB_CONFIG, temp);
> > temp = INREG(RADEON_MPP_TB_CONFIG);
> >