Messages in this thread | | | From | Bjorn Helgaas <> | Subject | Re: device driver for the SGI system clock, mmtimer | Date | Thu, 16 Sep 2004 10:54:51 -0600 |
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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? - 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/
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