[haiku-commits] Re: r41402 - haiku/trunk/src/system/kernel/arch/x86
- From: Fredrik Holmqvist <fredrik.holmqvist@xxxxxxxxx>
- To: haiku-commits@xxxxxxxxxxxxx
- Date: Mon, 9 May 2011 21:08:37 +0200
2011/5/9 Michael Lotz <mmlr@xxxxxxxx>:
> In principle giving it more exposure would be great. I'd like to wait a
> bit until some "early-adopters" can give it a try with various
> configurations though. I'm afraid we'll have to implement some kind of
> ACPI cut-off date, blocking the use of ACPI for BIOSes dated earlier,
> because from what I've read there definitely are a lot of plain broken
> ACPI BIOSes around. Also some specific systems may need to be
> blacklisted. In any case I'm in favor of enabling the IO-APIC by default
> after a short cool-down phase, let's say one or two weeks from now,
> depending on how much feedback comes in.
I looked into this a lot before enabling ACPI by default. There are a
lot of broken ACPI implementations out there. Many problems arise
because MS and ACPICA's implementations are different.
Most are simple bugs, returning the wrong type, not returning anything
and similar things.
ACPI-CA however has countered this by trying to handle most of these situations.
They list a lot of these problems in their changelog:
http://www.acpica.org/download/changes.txt
Many comments in Linux and FreeBSD are probably from a time when
ACPICA was not so forgiving.
Hopefully it won't be that serious for us.
/Fredrik Holmqvist, TQH
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