linux-kernel - Re: HPET force-enable investigations on Via VT8235

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Message-ID: <20070806235752.1e6c5653@laptop.hypervisor.org>
Date:	Mon, 6 Aug 2007 23:57:52 +0200
From:	"Udo A. Steinberg" <us15@...inf.tu-dresden.de>
To:	Rafał Bilski <rafalbilski@...eria.pl>
Cc:	Andreas Mohr <andi@...as.de>,
	David Edwards <powertop@....lusars.net>, power@...host.org,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org
Subject: Re: HPET force-enable investigations on Via VT8235

On Mon, 06 Aug 2007 23:39:30 +0200 Rafał Bilski (RB) wrote:

RB> VT8235 does *NOT* have a HPET(*). Only part which has HPET is VT8237. It
RB> is device 00:17.0 too, but only 1106:3227 has HPET enable and memory
RB> base registers. VT8235 one and only feature which doesn't have driver
RB> yet seems to be hardware watchdog.
RB> (*) Datasheet revision 2.03 March 16, 2005

We have an Asrock K7VT4A+ board with VT8235 southbridge in our lab and it
does have an HPET. Just because the datasheet does not document HPET does
not mean it is not implemented.

My guess is that newer revisions of VT8235 have HPET whereas older revisions
do not. I'll get an lspci dump from our box tomorrow.

Cheers,

	- Udo

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