nForce info in Wiki / VGA base address thoughts

Hi!

As you might know, I am still looking for the information how to set  
the base address for the GPU on the shared-memory nForce/Xbox  
architecture, so that we can set up standard B800:0000-style text  
modes in the Xbox.

I uploaded the nForce 220/420 VGA ROM and its disassembly to http:// 
xbox-linux.org/down/nforce/ - we would need to find code there that  
finds out how much RAM is installed. I check for the "int"  
instruction, but none seemed like it checked the available system RAM.

On the other hand, perhaps the VGA hardware is not aware of this at  
all, and this must be configured in the chipset - perhaps inside the  
APG-to-PCI bridge? I'll have a look at that, if anyone else is  
interested, please also have a look at it.

I also put together some more information and links about the nForce/ 
Xbox chipset at:

http://www.xbox-linux.org/wiki/NForce

Feel free to contribute!

   Michael


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