Roland,
We have a problem. I created a Debian 11 PPC64 image with a recompiled VLC without AltiVec. Additionally I compiled the new Open Surge 0.5.2.1 and added it to this image.
I uploaded this image today. Download: debian-11.0-ppc64.img.tar.gz
It works without any problems on the X1000. Unfortunately Xorg doesn't start on the X5000.
Casey reported this issue two years ago.
Link to the thread: Debian PPC64
Additionally he created a bug report: Xorg problem preventing bootup
Maybe a problem with a missing fpsqrt instruction: PPC64: gcc currently compiles for power4 by default, causing glibc's sqrtf to fail on e6500
Cheers,
Christian