use of xf86-video-omapfb in Xserver


I am currently having Xserver running on ARM. my display size is 640x480.

I have heard about xf86-video-omapfb.

How to use this and recompile the Xserver using xf86-video-omapfb.

If i use this, cpu utlitized will come down or it will be the same as old running on ARM.

Thanks and Regards,