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

[GUERRAZ Francois]

Hello,

Can you confirm to me that if I have only one periodic timer on my
motherboard I can only have one qemu-instance running using hpet?

Thanks.

François.

Le mardi 21 août 2007 à 21:40 +0200, Luca a écrit :
> On 8/21/07, Matthew Kent <address@hidden> 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 <address@hidden>
> >
> > 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.
> 
> "dmesg | grep hpet" should tell you something like:
> 
> hpet0: 3 64-bit timers, 14318180 Hz
> 
> Luca
> 
> 
>