I've tested this right now with FAUmachine, and there it is enough to add only DefaultDepth 24 to the xorg.conf.
My best guess is, that this is indeed a X problem, which results from the default depth being 32. Since a real cirrus gd5446 doesn't support this depth, I believe that X wouldn't start with a real card as well.
I've tested this right now with FAUmachine, and there it is enough to add only DefaultDepth 24 to the xorg.conf.
My best guess is, that this is indeed a X problem, which results from the default depth being 32. Since a real cirrus gd5446 doesn't support this depth, I believe that X wouldn't start with a real card as well.