Messages in this thread | | | Date | Wed, 5 Jun 2002 03:02:23 +0200 | From | Dave Jones <> | Subject | Re: 2.4.19-pre10-ac1: Hardcoded cpu_khz in powernow-k6.c |
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On Wed, Jun 05, 2002 at 02:52:15AM +0200, Adrian Bunk wrote: > Hi Dave, > > while reading through powernow-k6.c in 2.4.19-pre10-ac1 I found the > following that seems to be a bug: > > static unsigned long cpu_khz=350000; > > Not every K6-2/3 runs at 350 MHz...
iirc, there aren't any MSRs[*] on the K6-2 where we can read the current FSB. I think 350MHz was used as it was probably the slowest K6-2 to be found at the time. You can override it with boot time arguments.
Dave.
[*] The K6 style powernow was reverse engineered, as there were no publically available documents explaining it. All we can do is scale multipliers. No voltage scaling, no FSB decoding.
-- | Dave Jones. http://www.codemonkey.org.uk | SuSE Labs - 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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