linux-kernel - Re: Does the kernel HPET support has problems or the hwclock from util-linux?

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Message-ID: <91b13c310707051906l94be14u795a058bd838ef3d@mail.gmail.com>
Date:	Fri, 6 Jul 2007 10:06:37 +0800
From:	"rae l" <crquan@...il.com>
To:	"David Brownell" <david-b@...bell.net>
Cc:	rtc-linux@...glegroups.com,
	"Luca Tettamanti" <kronos.it@...il.com>,
	"Linux Kernel list" <linux-kernel@...r.kernel.org>
Subject: Re: Does the kernel HPET support has problems or the hwclock from util-linux?

On 7/3/07, Luca Tettamanti <kronos.it@...il.com> wrote:
> rae l <crquan@...il.com> ha scritto:
> > from this address, I know util-linux-2.12r is the latest:
> > http://www.kernel.org/pub/linux/utils/util-linux/util-linux-2.12r.lsm
> >
> > My Dell OptiPlex 320 has 4 HPET timers and no RTC, so the execution of
> > hwclock has errors:
> >
> > gektop@tux ~ $ /sbin/hwclock --show
> > select() to /dev/rtc to wait for clock tick timed out
> > gektop@tux ~ $ /sbin/hwclock --version
> > hwclock from util-linux-2.12r
>
> I think that the problem is that HPET and the CMOS RTC (list in CC)
> share the same interrupt line.
> I suppose that you should enable CONFIG_HPET_RTC_IRQ (my hardware has
> the same "feature"); in this way /dev/rtc correcly reports that it
> cannot deliver the interrupt (when HPET is enabled) and hwclock uses
> direct ISA access.
I searched the CONFIG_HPET_RTC_IRQ, it's conflict with
HPET_EMULATE_RTC, that I've enabled.
so while HPET_RTC_IRQ is the good way, EMULATE_RTC is a bad way.

>
> Luca
> --
> Windows NT crashed.
> I'm the Blue Screen of Death.
> No one hears your screams.
>


-- 
Denis Cheng
Linux Application Developer
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