[Qemu-devel] Re: [SeaBIOS] [PATCH 0/8] option rom loading overhaul.

[Anthony Liguori]

Gleb Natapov wrote:
> On Sun, Dec 20, 2009 at 09:11:18AM -0600, Anthony Liguori wrote:
>   
> > Gleb Natapov wrote:
> >     
> > > On Sun, Dec 20, 2009 at 08:58:40AM -0600, Anthony Liguori wrote:
> > >       
> > > > No.  You have to physically shut down and start up again.  That's
> > > > the right semantics IMHO.
> > > >
> > > >         
> > > Reset is equivalent (or should be) to shut down and start up again.
> > >       
> > Not at all.  Reset can happen in a lot of different ways, some that
> >     
> We support only one way of reset: hard reset. It equivalent to full
> HW power cycling. ACPI spec define ACPI reset as equivalent to HW power
> cycling too BTW (see 4.7.3.6).
>   

For every system periphereal?  For instance, memory contents survive a 
reset whereas they won't survive a hard power down.

More importantly though, what's the use-case here?

> This will work only if we assume that rom file size doesn't shrink,

Well the easy thing to do is hard code the rom size into qemu and throw 
an error if the rom size increases.  That way, if a rom does shrink, 
we're safe and if a rom size increases, we get an immediate run time 
error that gives the contributor feed back that they need to bump the 
constant.

Regards,

Anthony Liguori

>  
>
> --
>                         Gleb.
>