Re: 2.4.19-pre10-ac1: Hardcoded cpu_khz in powernow-k6.c

[Dave Jones <davej@suse.de>]

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