Re: qemu oddness with isolinux vesamenu.c32

["H. Peter Anvin" <hpa@zytor.com>]

Avi Kivity wrote:
> H. Peter Anvin wrote:
>> H. Peter Anvin wrote:
>>>
>>> Yes, although simulating the memory "pre-shadowed" works just as 
>>> well; then it should be marked readonly by the BIOS immediately prior 
>>> to running INT 19h.
>>
>> On top of this, getting proper DDIM support and PCI expansion ROM into 
>> the BIOS would be a good thing.  A PCI expansion ROM is attached to a 
>> PCI device as a BAR and mapped into high memory, it is then copied to 
>> shadowed RAM by the BIOS and its initialization stub is run.  This is 
>> done one device at a time, so that the initialization code can be 
>> discarded, per the DDIM spec.
> 
> I imagine it's necessary for proper pci device assignment.
> 

Well, if nothing else it would permit PCI device ROMs to work 
unmodified.  I was rather disappointed when I found out I couldn't 
simulate PXE ROMs, even from devices which we can emulate.

	-hpa