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    SubjectRE: [discuss] Re: Please pull x86-64 bug fixes
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    OK, lets' take K8 processor performance states (p-states) as an example:
    BIOS, which should know 'best' about a given platform, needs to
    communicate to the OS what 'voltage' (VID code) is correct for given
    'frequency' (FID),
    and it can do that via ACPI processor tables (_PSS). Otherwise, OS code
    is left with having to manage a HUGE amount 'specifics' (processor
    models), and endless driver revisions to account for new parts.

    So, one can argue that there's merit on having ACPI, it's just a shame
    when BIOS doesn't get it right! (thus the justification for lack of
    'trust'... the same can probably be said about other BIOS issues, not
    just ACPI)

    Leo Duran


    -----Original Message-----
    From: Rafael J. Wysocki [mailto:rjw@sisk.pl]
    Sent: Friday, October 06, 2006 5:01 PM
    To: Linus Torvalds
    Cc: Arjan van de Ven; Jeff Garzik; Andi Kleen; discuss@x86-64.org;
    linux-kernel@vger.kernel.org
    Subject: Re: [discuss] Re: Please pull x86-64 bug fixes

    On Friday, 6 October 2006 18:07, Linus Torvalds wrote:
    >
    > On Fri, 6 Oct 2006, Arjan van de Ven wrote:
    > >
    > > we can do a tiny bit better than the current code; some chipsets
    have
    > > the address of the MMIO region stored in their config space; so we
    can
    > > get to that using the old method and validate the acpi code with
    that.
    >
    > Yes. I think trusting ACPI is _always_ a mistake. It's insane. We
    should
    > never ask the firmware for any data that we can just figure out
    ourselves.
    >
    > And we should tell all hardware companies that firmware tables are
    stupid,
    > and that we just want to know what the hell the registers MEAN!
    >
    > I've certainly tried to tell Intel that. I think they may even have
    heard
    > me occasionally.
    >
    > I can't understand why some people _still_ think ACPI is a good idea..

    I violently agree.

    Rafael


    --
    You never change things by fighting the existing reality.
    R. Buckminster Fuller





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