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    SubjectRe: BIOS, Duron4 specifics...
    On Tue, 10 Jul 2001, John Clemens wrote:

    > I've got a new laptop with an AMD Duron in it, based on the Athlon4 core
    > (PowerNow, SSE, hardware prefetch, etc.. Palomino core).. However, it
    > appears none of the useful features are enabled in the bios. For example,
    > Nowhere does it appear to enable SSE or the APIC.

    afair, the mobile Durons are not based upon the Athlon 4 core, and
    hence won't have the features you mention. You can verify this with
    my x86info tool which you can get from

    This will decode the PowerNOW capabilities register (if it exists)
    and tell you if its capable of Bus speed division/Voltage ID control.

    I'd be interested in getting the output of x86info -a on this
    send to me by private mail btw.

    Oh, and you'll need a kernel with the MSR/CPUID drivers loaded.

    > Also, whats the state of powernow/clock throttling support? I know there
    > was talk of a generic power management/clock control interface a while
    > back, where is that project/whats it's status/etc?

    The kernel side implementation of this lives in Russell King's CVS.
    Grab it using..

    cvs -d login
    cvs -d checkout cpufreq

    cvs commit list:

    Note, the Athlon 4 implementation of PowerNOW is currently unsupported,
    I'm looking into this right now, after having a chance to talk with
    some of the AMD guys at the UKUUG developers conference last week.
    The PowerNOW implementation in the CVS tree is equivalent to that
    available in my Powertweak program ( and
    its derivative 'k6mult'.

    As this implementation was largely reverse engineered, its incomplete
    and only supports bus scaling, not voltage scaling. This is something
    else we hope to get supported sometime.

    The userspace support for this is about to commence, in both a standalone
    utility, and a Powertweak plugin.



    | Dave Jones.
    | SuSE Labs

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