Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S268382AbUIPSCg (ORCPT ); Thu, 16 Sep 2004 14:02:36 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S268453AbUIPR77 (ORCPT ); Thu, 16 Sep 2004 13:59:59 -0400 Received: from ztxmail05.ztx.compaq.com ([161.114.1.209]:32774 "EHLO ztxmail05.ztx.compaq.com") by vger.kernel.org with ESMTP id S268186AbUIPR6f (ORCPT ); Thu, 16 Sep 2004 13:58:35 -0400 Message-ID: <4149D655.5070904@hp.com> Date: Thu, 16 Sep 2004 14:07:17 -0400 From: Robert Picco User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.6) Gecko/20040510 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Bjorn Helgaas Cc: Christoph Lameter , linux-kernel@vger.kernel.org, Jesse Barnes , venkatesh.pallipadi@intel.com Subject: Re: device driver for the SGI system clock, mmtimer References: <200409161003.39258.bjorn.helgaas@hp.com> <200409161054.51467.bjorn.helgaas@hp.com> In-Reply-To: <200409161054.51467.bjorn.helgaas@hp.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1720 Lines: 52 Bjorn Helgaas wrote: >On Thursday 16 September 2004 10:32 am, Christoph Lameter wrote: > > >>On Thu, 16 Sep 2004, Bjorn Helgaas wrote: >> >> >>>Christoph Lameter wrote: >>> >>> >>>>The timer hardware was designed around the multimedia timer specification by Intel >>>>but to my knowledge only SGI has implemented that standard. The driver was written >>>>by Jesse Barnes. >>>> >>>> >>>As far as I can see, drivers/char/hpet.c talks to the same hardware. >>>HP sx1000 machines (and probably others) also implement the HPET. >>> >>> >>The Intel Multimedia Standard is a earlier and different timer spec. >> >> > >I have a spec that's labelled "IA-PC Multimedia Timers", preliminary >draft of June 2000, revision 0.97, which looks like the one mentioned >in your patch. > >I also have something labelled "IA-PC HPET (High Precision Event >Timers) Specification", draft of February 2002, revision 0.98, >which is what drivers/char/hpet.c supports. > >I admit I haven't compared them in great detail, but they certainly >*look* like they're close enough that the same driver could support >both, and the 0.98 revision history only mentions fairly cosmetic >changes (like the name :)). > >Is there something specific that drivers/char/hpet.c expects that >your hardware doesn't implement? > > > Look at HPET revision history. Specifically 0.98 01/20/2002 * Product name changed: from Multimedia Timer to HPET (High Precision Event Timer) Bob - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/