On Wed, Nov 24, 2010 at 06:33:17PM +0200, Avi Kivity wrote:
> On 11/24/2010 06:29 PM, Gleb Natapov wrote:
> >>
> >> >> >Besides, as I said, PIIX3 is ISA bridge and this
> >> >> >is what class should implement.
> >> >>
> >> >> Isn't it an ISA bridge + a few ISA devices?
> >> >>
> >> >Why? Because they happen to be on the same silicon? So then in SoC
> >> >all devices are in cpu?
> >>
> >> PIIX3 is what the PIIX3 spec says it is. We decompose it into the
> >> PIIX3 ISA bridge, real time clock, etc. Some of these components
> >> are standardized and can be used stand-alone.
> >>
> >So PIIX3 is just a packaging of mostly independent components for cost
> >and space cutting. Just like SoC.
>
> Plus some magic glue. You can't say it is an ISA bridge. It's
> exactly what its spec says it is.
>
First thing my spec says is "Bridge Between the PCI Bus and ISA Bus"
> >> >> >We have fw_cfg on ISA bus too
> >> >> >which does not exits on real HW and we may want to have other
> >> >> >devices. We should be able to add them without changing PIIX3
> >> >> >class.
> >> >>
> >> >> fw_cfg should certainly not be a member of PIIX3.
> >> >>
> >> >It is really not much different from others.
> >>
> >> I couldn't find it in the PIIX3 spec.
> >>
> >I couldn't find it in _any_ spec. Should we get rid of it?
>
> Or write a spec.
>
It will not make it part of any existing system.
--
Gleb.
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