Xen33 Xorg in dom0

[Juergen Buchmueller <pullmoll%t-online.de@localhost>]

Hi,
I'm sure this question has been asked before. I installed Xen33 on my
NetBSD 5.0.1 box and text console is working fine, i.e. the setup is ok.

However, the radeonhd driver of XOrg doesn't detect any video memory.
If I specify some amount of memory in xorg.conf, it hits an assertion
with some CursorMem == -1. If I then enable the software cursor, I end
up with the driver not finding a useable video output path... seems to
be an endless sequence of problems.

I then tried vesa, which works for a part in that it switches the video
resolution. However the base address of the frame buffer doesn't seem
to be changed, because on the top scanlines I can see some pixel
garbage from the text console output. No cursor and no X output visible.

Without Xorg on Dom0 the Xen is pretty much useless for me, so I'm eager
to find a solution to my problems.

Graphics card is an ASUS EAH3450, which is detected as a radeonhd RV620
chipset. It works fine in NetBSD native mode, just not in Dom0.

Is there any advice for me to try out tweaks or config settings?

Juergen