Success (at last)!!

Greetings comrades,
after intensive investigation and (almost neverending) trial-and-error sessions with MDK10 and the Radeon9600 my desktop crate is finally set up the way I intended it. I apoloigze for this posting in advance as it could get a bit lengthy, but I've spent quite some time to fix this issue, and I thought giving away a more detailled description including approaches that did not result in success might be helpful for other hardware-noobs like me. Also forgive my some occasional typos as it's late already here ... So here's a log of my activies (including "go's" and "no-go's").
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NO_GO:
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Kernel 2.6.4 with "everything built in but the kitchen-sink"
(phrase courtesy of J.Mullins - SOF II

I compiled and tried this kernel version with all ATI-relevant things built in - these were: nForce/2-, agpgart/nvidia-agp. This lead to a very compact kernel that limited "lsmod"-output to just 2 lines ... the codepage-modules. In this setup, running the ATI-rpm produces fatal errors upon final module insertion ("permission denied"). Consequently a manual "modprobe" <fglrx.ko> produced the same result. That lead me back to the kernel MDK-10 2.6.3mdk-kernel, as delivered "fresh out of the box".
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On a sidenote: If you are using USB-stuff you should stick with the MDK-kernel as it seems to be patched to supports "supermount" which 2.6.4 doesn't unless you apply the appropriate patch.
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GO:
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I booted into the standard MDK-installation as it has been installed in the first place by MDK10 and performed these tasks on the command line (so there, no "X") ...
STEP 1: Prepare the setuproot@machine ati_drv: rpm -Ui --force fglrx-4.3.0-3.7.6.i386.rpm(this extracts installs the sources into the proper locations)STEP 2: Build the core-moduleroot@machine ati_drv: cd /lib/modules/fglrx/build_mod(change to dir. to build the driver-module)(optional) ... perform a ...root@machine build_mod: chmod a+x make.sh(to make the script executable if necessary. For some peculiar reason the make-files here only had the "r"-attr. for owner set)STEP 2.1: Built itroot@machine build_mod: ./make.sh(this builds the core-driver-module)STEP 3: Install the driver-moduleroot@machine build_mod: cd ..(go up one directory, this should bring you to /lib/modules/fglrx)(optional) ... perform the "chmod a+x"-command on "make_install.sh"-file if needed (see above)STEP 3.1: Perform the installationroot@machine fglrx: ./make_install.sh(this builds the core-driver-module)If everything goes well up to this point, the fglrx-directory should contain a symbolic link like this ...
fglrx.ko -> /lib/modules/fglrx/fglrx.2.6.3-4mdk-SMP.koSTEP 4: Checking the loaded AGP-modulesType ...
root@machine fglrx: lsmodto check if any AGP-relevant modules are loaded. In my case none was loaded so I inserted the one for my mobo (A7N8X-X, nForce2-chipset) ...
root@machine fglrx: modprobe nvidia-agpA second "lsmod" should now list "agpgart" which is used by "nvidia-agp".
To make these settings permanent I added this line to
"/etc/modprobe.conf" ...
install fglrx /sbin/modprobe --ignore-install fglrx && { /sbin/modprobe nvidia-agp; /bin/true; }To be honest, I have no idea if this is a cruical thing or not, but it worked here, so I thought I just mention it

Inserting the ATI-driver-module finally braught this result
[tt]
fglrx 204228 172
nvidia-agp 7388 1
agpgart 31016 2 nvidia-agp
[/tt]
STEP 5: Running fglrxconfigNow it's time to run the ATI-XF86Config-tool ... type ...
root@machine fglrx: fglrxconfigand follow the steps.
IMPORTANT:
When getting asked whether or not to use an external AGP-module, type
Y. For me this was the cruical part as the fglrxconfig-tool has "[n]" preselected and the description is a fair bit misleading, insinuating that the "internal" AGP-module would be the right thing to do (which it wasn't here).
Well, before I get sued by the linuxcompatible-folks for being a forum-post-hog I call it quits at this point. Thanx again to all the folks here who replied and to the forum-crew for providing this platform.
evening