AGP cards haven't been tested and probably don't work yet.  Still, it shouldn't crash.  I'll add a check to not init the drm if the card is AGP until we get r6xx AGP support.

This crash happened for me too when I forgot to enable option DRI
which from your log seems to be your case :

(II) RADEONHD(0): Direct rendering turned off by default. Use Option "DRI" to enable.

And the fix for this specific crash is :

diff --git a/src/rhd_video.c b/src/rhd_video.c
index a7b25a2..bbfc454 100644
--- a/src/rhd_video.c
+++ b/src/rhd_video.c
@@ -820,6 +820,8 @@ RHDInitVideo(ScreenPtr pScreen)
     RHDFUNC(pScrn);
 
     num_adaptors = xf86XVListGenericAdaptors(pScrn, &adaptors);
+    if (!adaptors || num_adaptors<=0)
+       return;
     newAdaptors = xalloc((num_adaptors + 2) * sizeof(XF86VideoAdaptorPtr *));
     if (newAdaptors == NULL)
        return;

But the driver still crashes later because CS is not enabled.

OK, with the following patch:

http://www.botchco.com/alex/xorg/force_pcie_mode.diff

The drm.ko/radeon.ko/r6xx-r7xx-branch of Radeon HD (after following the instructions here: http://www.x.org/wiki/radeonhd:r6xx_r7xx_branch and applying the patch), starts and works. However, I have problems with many fonts (like disappearing lowercase-"b" - malformed uppercase "I") and many artifacts on the screen. Like I said I have an AGP Radeon HD 2600 card, and can send you my xorg.conf. It doesn't happen in the radeonhd-dri master branch. I'm still on Mandriva Cooker.

Regards,

-- Shlomi Fish

Does this issue occur with the preferred ati driver (xf86-vide-ati)?  If so, please move this to the Driver/Radeon component.  

Development of radeonhd has pretty much halted and development focus is on the ati driver.  Please see http://www.x.org/wiki/radeonhd

If the issue does not exist in the ati driver (or if there is no response to this message), this bug will be closed as WONTFIX unless someone contributes a patch.

(In reply to comment #4)
> Does this issue occur with the preferred ati driver (xf86-vide-ati)?  If so,
> please move this to the Driver/Radeon component.  
> 

It does not occur. Resolving as WONTFIX.

> Development of radeonhd has pretty much halted and development focus is on the
> ati driver.  Please see http://www.x.org/wiki/radeonhd
> 
> If the issue does not exist in the ati driver (or if there is no response to
> this message), this bug will be closed as WONTFIX unless someone contributes a
> patch.