Reverse engineer video BIOS initialization

Hi,

recently I bought a Geforce PCI FX5200 and some HP j6750. (OK, it was the
other way around ;-)
Of course, the graphics card do not work with xorg on this machine.

In your article "Graphics cards with PA-RISC Linux", you stated, that such
a graphics card has to be awaken by its BIOS and that the exact wake-up
sequence is yet unknown.

It happens, that I have access to some up-to-date logic-analyzers. So I
plan to attach some probes to the pci-slots of an old x86 mainboard. The
LA then can record all read- and write-accesses on the PCI-bus addressed
on the graphics-card. It should be very simple to write a small c-code
that will reproduce these reads- and writes.

My question now is: Where would be the best place to execute such a
wake-up code?
As the company I work for is more into IA, I don't know much about PA-RISC
architecture.
Does PA-RISC machines have a kind of real-mode in which all BIOS-codes
must run? Or would it be sufficient to issue the wake-up code at any time
on an mmaped memory?


Thanx,

Gregor Rebel