Sorry guys but I just don't have the time to keep up with the editing of these bios'
For anyone that wants to take over though please do, just check the before and after bios in the thread for how I did it
Basically hex edit the bios
At the beginning of the bios around 00000220 (every bios different) you will see at the right: PCIR € € AMD ATOMBIOS
So in hex the € is 80, change the second €/80 to 00
This toggle makes it see a UEFI Gop partition in the bios, 80 is no gop 00 if gop
Then scroll down to 00010000
This is where gop bios starts, copy and paste a gop bios from a working rom into here
Then the difficult bit is getting a gop bios and normal bios that are compatible, this is the main problem we have here, either it works or it don't and then there is the case of clocks and voltages being the same and this is a problem
So although it is possible to add gop its not 100% perfect until someone can perfect this process
For now I suggest just flashing 1 of the working gop bios in first post which is supplied by a gpu manufacture is the best option. There is a few to choose from, for most the PowerColor seems to work very well!
I have also attached an example of before and after mod:
GOP-Example.zip 148k .zip file
Edited by liamstears - 6/12/13 at 6:25am