The X server can be started with:
xinit -- /usr/XF86-main/bin/XFree86
Automatic loading of DRM kernel modules was added to the X server in XFree86 4.0.1. This feature, and manual loading of kernel modules, is documented in the DRI user guide.
At this point your X server should be up and running with hardware-accelerated direct rendering. Please read the DRI User Guide for trouble shooting information.