Messages in this thread | | | Date | Thu, 16 Sep 2004 14:07:17 -0400 | From | Robert Picco <> | Subject | Re: device driver for the SGI system clock, mmtimer |
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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)
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