This is a temporary solution, it is not supported. This article should be removed after we have an RPM for XFree86 4.0.1.
You compiled the XFree86 4.0.1 Development tree. (See http://linuxppc.org/usr/xf4/) When you try to use the ATI driver, it doesn't seem to exist.
The config file is not set to compile the ATI driver by default.
Go into the xc directory. Edit the file in xc/config/cf/xfree86.cf. Change the line:
trident chips fbdev \ --to-- trident chips fbdev ati imstt tdfx \
Recompile and enjoy!