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    SubjectRe: Cyrix 6x86MX and Centaur C6 CPUs in 2.1.102
    On Mon, 18 May 1998, Alan Cox wrote:

    #> if ((boot_cpu_data.x86_capability & 16) && (boot_cpu_data.x86_vendor !=
    #> X86_VENDOR_CYRIX) && (boot_cpu_data.x86_vendor != X86_VENDOR_CENTAUR)) {
    #
    #This is also slightly wrong. Only step 0 of the centaur C6 has the RDTSC
    #power bug according to the errata documents. I think it should read
    #the above + if the CENTAUR case & stepping==0)
    #That sound right ?

    Now that I'm more awake than last night ;), I can't say whether or not
    this is correct. I won't touch Centaurs. However, it's possible, maybe
    probable. If anyone would like to volunteer to check for us, it'd be
    greatly appreciated. :)

    if ((boot_cpu_data.x86_capability & 16) && (boot_cpu_data.x86_vendor !=
    X86_VENDOR_CYRIX) && (boot_cpu_data.x86_vendor == X86_VENDOR_CENTAUR
    (boot_cpu_data.x86_stepping == 0))) {

    That may or may not be correct, probably not. I'm still not entirely
    awake, and I threw that together in my head in a second or two. However,
    you get the gist of the idea, right? :)

    For those of you who don't...

    If x86_capability & 16 and VENDOR != Cyrix and VENDOR == Centaur and
    STEPPING == 0...

    yaddayadda. :) Why risk breaking CPUs that aren't already 'broken?' ;)

    -Phil R. Jaenke (kernel@nls.net / prj@nls.net)
    TheGuyInCharge(tm), Ketyra Designs - We get paid to break stuff :)
    Linux pkrea.ketyra.INT 2.0.33 #15 Sat Apr 18 00:40:21 EDT 1998 i586
    Linux eiterra.nls.net 2.0.33 #15 Fri Apr 17 00:22:13 EDT 1998 i586
    - Linus says for 'brave people only.' I say 'keep a backup.' - :)


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