Silicon Motion SM501 Voyager GX fb driver development

[Clemens Koller <clemens.koller@anagramm.de>]

Hello!

Well, I am about to implement a fbdev for the Silicon Motion Inc.'s
SM501 (alias Voyager GX) embedded graphics controller for our
next projects. (http://www.siliconmotion.com/sm501.htm)

The goal is to get a stable fb up and running on a current Kernel 2.6.x
The Platform is currently a PowerMac G4 Windtunnel (CRUX PPC 2.0)
and later on it will be a Freescale MPC8540 embedded processor.
The SM501 hardware is the PCI Demo Board from SMI.

I've started from the latest ix86 released driver from SMI and I
got some basic functionality working. (There appears some (sometimes 
garbled) image on the panel, driver has memory leaks, as there are
pci_resource and ioremap problems ...)
So, the point is, I want to "fix" or better re-write the code
from SMI to get an up-to-date driver for Kernel 2.6.

My question is: Where is a good way to start to learn from
already existing code? radeonfb or aty128fb or which driver
is the most current and Kernel 2.6 aware driver.
Later on I will also need to implement power management and
try to get the other SM501 peripherals working (USB, Audio,
Touchpanel,...)

It's my first framebuffer thing I do, so there might be some
novice questions or completely ungeek mistakes.
Currently I want to fix the module load/unload (ioremap/iounmap)
thing if ioremap is really the current way to do it.
For sure, you can get my code if you want. But it's still in
pretty ugly condition.

Best greets,

-- 
Clemens Koller
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Phone: +49-89-741518-50
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