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    SubjectRe: [PATCH] x86/pci: add pci=skip_isa_align command lines.
    On Thu, Mar 27, 2008 at 10:59 AM, Gary Hade <garyhade@us.ibm.com> wrote:
    >
    > On Thu, Mar 27, 2008 at 09:45:57AM +0100, Ingo Molnar wrote:
    > >
    > > * Yinghai Lu <yhlu.kernel.send@gmail.com> wrote:
    > >
    > > > [PATCH] x86/pci: add pci=skip_isa_align command lines.
    > > >
    > > > so we don't align the io port start address for pci cards.
    > > >
    > > > also move out dmi check out acpi.c, because it has nothing to do with
    > > > acpi. it could spare some calling when we have several peer root
    > > > buses.
    > >
    > > i like this feature, and i've applied your patch to x86.git for testing,
    > > but i'd like to hear what the ACPI and PCI guys think about this.
    > >
    > > Also, we should try as hard as possible to make it a blacklist instead
    > > of a whitelist? It would be cool to support more PCI cards/devices on
    > > all new(-ish) systems by default and if we didnt have to maintain the
    > > DMI whitelist for eternity. (a whitelist will always be incomplete and
    > > will lag behind reality)
    >
    > Ingo, This is a great idea. I was the guy that added the whitelist
    > and ISA alignment avoidance code but have also been concerned about
    > the headache of keeping whitelist current in mainline and Distro
    > releases as new systems are introduced. When I made the change I
    > assumed (appearently incorrectly) that there were way too many
    > existing systems requiring the alignment to even consider the
    > blacklist approach. Do you have any suggestions on how to identify
    > systems to include in the blacklist? ...or would we just boldly make
    > non-alignment the default, provide an empty blacklist, and let
    > breakage identify those systems that need to be blacklisted?

    at least to use blacklist with x86_64

    YH


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