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    SubjectRe: [PATCH 3/9] x86/moorestown: add moorestown platform flags
    On Fri 2009-06-26 09:54:54, Jesse Barnes wrote:
    > On Fri, 26 Jun 2009 18:32:42 +0200 (CEST)
    > Thomas Gleixner <tglx@linutronix.de> wrote:
    >
    > > On Fri, 26 Jun 2009, Ingo Molnar wrote:
    > > > [ Although it is beyond me why ABP was done - why wasnt HPET good
    > > > enough? HPET can do per CPU clockevents too and it's just as
    > > > off-chip (and hence fundamentally slow) as ABP. ]
    > >
    > > Welcome to the wonderful world of embedded systems. Just have a peek
    > > into arch/[arm/powerpc/mips] to see what's coming up to us with full
    > > force. I would not be surprised when we see an x86 system sharing the
    > > device driver for i2c or whatever with an ARM SoC in the foreseable
    > > future.
    >
    > Ha, yeah I was just going to say "think embedded". ABP is a much
    > simpler spec and programming interface than HPET, and since we were
    > designing new custom silicon, it made sense to just do the simple
    > thing, rather than butchering an existing spec, then making a partial
    > HPET that looks like ABP anyway and forcing any future HPET updates to
    > conform to the new standard (very similar reasoning to the ACPI vs SFI
    > discussion btw). Hopefully the technologies we've come up with for

    Very similary wrong, I'd say :-(. While you could have created
    hpet-lite, where hpet-lite driver would work on hpet system, you went
    and created something new.

    And yes, SFI is similar disaster, you should just define subset of
    acpi ('acpi-lite').

    In the end, you are willing to use silicon for compatibility (arm
    instruction set needs less transistors, right?) and wasting millions
    of transistors, then try to save thousands with non-compatible
    devices :-(.

    Pavel



    --
    (english) http://www.livejournal.com/~pavelmachek
    (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html


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