Re: [RFC] ACPI on arm64 TODO List

Pavel Machek
2015-01-12T19:39:08Z

On Mon 2015-01-12 14:41:50, Grant Likely wrote:
> On Mon, Jan 12, 2015 at 2:23 PM, Pavel Machek <pavel@ucw.cz> wrote:
> > On Sat 2015-01-10 14:44:02, Grant Likely wrote:
> >> On Wed, Dec 17, 2014 at 10:26 PM, Grant Likely <grant.likely@linaro.org> wrote:
> >> > On Tue, Dec 16, 2014 at 11:27 AM, Arnd Bergmann <arnd@arndb.de> wrote:
> >> >> On Monday 15 December 2014 19:18:16 Al Stone wrote:
> >> >>> 7. Why is ACPI required?
> >> >>> * Problem:
> >> >>> * arm64 maintainers still haven't been convinced that ACPI is
> >> >>> necessary.
> >> >>> * Why do hardware and OS vendors say ACPI is required?
> >> >>> * Status: Al & Grant collecting statements from OEMs to be posted
> >> >>> publicly early in the new year; firmware summit for broader
> >> >>> discussion planned.
> >> >>
> >> >> I was particularly hoping to see better progress on this item. It
> >> >> really shouldn't be that hard to explain why someone wants this feature.
> >> >
> >> > I've written something up in as a reply on the firmware summit thread.
> >> > I'm going to rework it to be a standalone document and post it
> >> > publicly. I hope that should resolve this issue.
> >>
> >> I've posted an article on my blog, but I'm reposting it here because
> >> the mailing list is more conducive to discussion...
> >>
> >> http://www.secretlab.ca/archives/151
> >
> > Unfortunately, I seen the blog post before the mailing list post, so
> > here's reply in blog format.
> >
> > Grant Likely published article about ACPI and ARM at
> >
> > http://www.secretlab.ca/archives/151
> >
> > . He acknowledges systems with ACPI are harder to debug, but because
> > Microsoft says so, we have to use ACPI (basically).
>
> Please reread the blog post. Microsoft is a factor, but it is not the
> primary driver by any means.

Ok, so what is the primary reason? As far as I could tell it is
"Microsoft wants ACPI" and "hardware people want Microsoft" and
"fragmentation is bad so we do ACPI" (1) (and maybe "someone at RedHat
says they want ACPI" -- but RedHat people should really speak for
themselves.)

You snipped quite a lot of reasons why ACPI is inferior that were
below this line in email.

Pavel

(1) ignoring fact that it causes fragmentation between servers and phones.

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