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Date: Tue, 21 Aug 2007 21:40:57 +0200
From: Luca <kronos.it@gmail.com>
Subject: Re: [Qemu-devel] [PATCH 3/4] Add support for HPET periodic timer.
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To: Matthew Kent <mkent@magoazul.com>
Cc: kvm-devel@lists.sf.net, qemu-devel@nongnu.org

On 8/21/07, Matthew Kent <mkent@magoazul.com> 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@gmail.com>
>
> 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