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    SubjectRe: 2.6.0-test1: CPUFreq not working, can't find sysfs interface
    On Tue, Jul 22, 2003 at 04:18:39PM +0200, textshell@neutronstar.dyndns.org wrote:
    > So it seems to me that the BIOS doesn't have the tables for my Athlon
    > model/stepping. I tried to get a new bios from hp, but it didn't change anything
    > relevant (they changed something in the PSTs but did not add a new one for my
    > processor)

    Indeed, that's the BUG().

    > > I guess it's yet another BIOS problem... [as seen quite often wrt AMD
    > > PowerNow, unfortunately]
    >
    > I think it would be a good thing to display a Message explaining why powernow
    > isn't working to the user in the case that no relevant PST is found.

    Patch appended at the end.

    > Can you suggest any workaround for this problem, or is my only option to
    > complain to HP do supply an updated BIOS.

    Well, you could try using the PST which mostly matches your system except
    the CPUID [PST #12, see below] -- if the values used are similar to the ones
    Windows XP uses. But this might be risky!!!

    > I very much would like to have a way to override (or add to) the bios provided
    > values.

    AFAIK, Dave Jones will add support to override the BIOS-provided tables.

    > --DEBUG: 7a0 ?= 781 && 21 ?= 21, 11 ?= 11
    > PST:12 (@0x4017d8dc)
    > cpuid: 0x781 fsb: 133 maxFID: 0x15 startvid: 0xb
    > num of p states in this table: 6
    > FID: 0x12 (4.0x [532MHz]) VID: 0x13 (1.200V)
    > FID: 0x4 (5.0x [665MHz]) VID: 0x13 (1.200V)
    > FID: 0x6 (6.0x [798MHz]) VID: 0x13 (1.200V)
    > FID: 0x8 (7.0x [931MHz]) VID: 0x13 (1.200V)
    > FID: 0xe (10.0x [1330MHz]) VID: 0xe (1.300V)
    > FID: 0x15 (13.5x [1796MHz]) VID: 0xb (1.450V)

    Dominik

    diff -ruN linux-original/arch/i386/kernel/cpu/cpufreq/powernow-k7.c linux/arch/i386/kernel/cpu/cpufreq/powernow-k7.c
    --- linux-original/arch/i386/kernel/cpu/cpufreq/powernow-k7.c 2003-07-11 14:12:35.000000000 +0200
    +++ linux/arch/i386/kernel/cpu/cpufreq/powernow-k7.c 2003-07-22 16:16:00.000000000 +0200
    @@ -345,6 +345,7 @@
    p+=2;
    }
    }
    + dprintk (KERN_INFO PFX "Did not find any PST table for this CPU -- exiting\n");
    return -EINVAL;
    }
    p++;
    -
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