[Open-graphics] X driver for OGD1

[Paul Brook]

I've made a first stab at an Xorg driver for the OGA. It can be downloaded 
from:

https://nowt.dyndns.org/oga/

It expects a PCI device with two memory ranges: a framebuffer and a control 
register region. The first 4k of the control region is mapped, but not 
currently used.

Tested on Debian Sid (Xorg 7.2). I guess it will probably work with any 
modular Xorg.

It's setup as a dumb 32-bit framebuffer. Everything is implemented in software 
by the X server, and you only get one head per card.

No attempt is made to do any card configuration.

I guess the next step is to get it to setup the video controller.

Paul