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

[Anthony Liguori <anthony@codemonkey.ws>]

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
>