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

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Date:	Mon, 2 Jul 2007 22:13:54 +0200
From:	Luca Tettamanti <kronos.it@...il.com>
To:	rae l <crquan@...il.com>
Cc:	rtc-linux@...glegroups.com, linux-kernel@...r.kernel.org,
	Adrian Bunk <bunk@...sta.de>
Subject: Re: Does the kernel HPET support has problems or the hwclock from util-linux?

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.

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