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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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