Getting a graphics display controller initialized can he quite tricky. Here are some links I found that may give you some helpful information.

http://ertw.dhis.org/Proj-GraphicLCD.htm

http://www.densitron.com/editor/pdfs/appnotessmallgraphic.pdf

http://www.geocities.com/dinceraydin/lcd/gfxfin.htm

http://www.hantronix.com/down/3224app.pdf

I hope this info helps get you on your way.
Michael Karas