Re: [Qemu-devel] HPET configuration in Seabios

[Avi Kivity]

On 08/29/2011 02:05 PM, Jan Kiszka wrote:
> On 2011-08-29 13:00, Avi Kivity wrote:
> >  On 08/29/2011 01:25 PM, Jan Kiszka wrote:
> >>>
> >>>   Can't seabios just poke at the hpet itself and see if it exists or not?
> >>>
> >>
> >>  Would be hard for the BIOS to guess the locations of the blocks unless
> >>  we define the addresses used by QEMU as something like base + hpet_no *
> >>  block_size in all cases.
> >>
> >
> >  Currently we have a fixed address.  We could do:
> >
> >    if available in fw_cfg:
> >        use that (may indicate no hpet)
> >    elif fixed address works:
> >        use that
> >    else
> >        no hpet
>
> Currently, we also only have a single HPET block, but that's just
> because of some QEMU limitations that will vanish sooner or later. Then
> nothing will prevent multiple "-device hpet,base=XXX".

Yes, so we should enable the fw_cfg interface before that happens.


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