Re: [Qemu-devel] [PATCH 3/4] Add support for HPET periodic timer.

Matthew Kent
2007-08-21T20:15:22Z

On Tue, 2007-21-08 at 21:40 +0200, Luca wrote:
> On 8/21/07, Matthew Kent <mkent-rTVjrLRGJfNWk0Htik3J/w@public.gmane.org> wrote:
> > On Sat, 2007-18-08 at 01:11 +0200, Luca Tettamanti wrote:
> > > plain text document attachment (clock-hpet)
> > > Linux operates the HPET timer in legacy replacement mode, which means that
> > > the periodic interrupt of the CMOS RTC is not delivered (qemu won't be able
> > > to use /dev/rtc). Add support for HPET (/dev/hpet) as a replacement for the
> > > RTC; the periodic interrupt is delivered via SIGIO and is handled in the
> > > same way as the RTC timer.
> > >
> > > Signed-off-by: Luca Tettamanti <kronos.it-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> >
> > I must be missing something silly here.. should I be able to open more
> > than one instance of qemu with -clock hpet? Because upon invoking a
> > second instance of qemu HPET_IE_ON fails.
>
> It depends on your hardware. Theoretically it's possible, but I've yet
> to see a motherboard with more than one periodic timer.

Ah thank you, after re-reading the docs I think I better understand
this.
--
Matthew Kent <mkent-rTVjrLRGJfNWk0Htik3J/w@public.gmane.org>