[Qemu-devel] Re: [PATCH 0/3]: Add UUID command-line option

[Anthony Liguori]

Sebastian Herbszt wrote:
> Anthony Liguori wrote:
> > > >  I like having a configuration blob but am uncomfortable with 
> > > > stashing it in
> > > > memory somewhere.  I would think maybe stealing a few IO ports and 
> > > > using
> > > > that to read the rom may be nicer (albeit slower).  I think it's 
> > > > something
> > > > that needs to be implemented fully to work out the kinks.
> > > >     
> > >
> > > Ok, I made a new version that uses IO ports. But then you have to
> > > select a port instead of address, is that any better?
> > >   
> >
> > A lot of the BIOS code is 16-bit and accessing high memory location 
> > from 16-bit code is a royal pain.  That is simplified with using IO 
> > ports.
>
> Could put it in the 0xe000 segment, e.g. 4kb below rombios16.bin at 
> 0xf000.

Which limits the size to 4kb.  If we use the IO port patch that Blue 
Swirl proposed, we have 64kb of space with a pretty reasonable expansion 
mechanism.

Regards,

Anthony Liguori

> - Sebastian