Date: Tue, 07 Sep 2004 11:26:50 -0700 From: Nate Lawson <nate@root.org> To: Roman Kurakin <rik@cronyx.ru> Cc: current@freebsd.org Subject: Re: Bug reports requested - acpi Message-ID: <413DFD6A.4030701@root.org> In-Reply-To: <413DF8A3.9060809@cronyx.ru> References: <412D02FE.2080805@root.org> <412F141E.5070102@cronyx.ru> <412F6283.7000900@root.org> <412F692D.7090007@cronyx.ru> <412FAAB2.3000407@root.org> <412FAD67.6050707@cronyx.ru> <413DF483.7050705@root.org> <413DF8A3.9060809@cronyx.ru>
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Roman Kurakin wrote:
> Nate Lawson wrote:
>> Roman Kurakin wrote:
>>
>>> Nate Lawson:
>>>
>>>> set hint.apic.0.disabled="1" at the loader prompt
>>>
>>> I'll try this tomorrow since I am going to sleep now. I hope it will
>>> reboot.
>>> If not I'll try to get to the work to fix its state.
>>
>> I have not heard back from you about whether disabling the APIC (not
>> ACPI) alone fixes the problem.
>
>
> My answer was:
>
> I was unaware of all that safe mode turns off, and than I last time
> check this I ovelooked
> that apic is also disabled. It seems that problem with APIC.
>
> But could you tell me how changes in ACPICA affect APIC code?
>
> Sorry if it was not very clean. Yes, disabling apic helps.
Please answer yes or no: ACPI enabled but APIC disabled works 100%?
Safe mode disables both ACPI and APIC so it's not a good test of where
the problem is. You should probably also test with ACPI disabled but
APIC enabled ("set hint.acpi.0.disabled=1").
The APIC code has two methods of enumerating PIC devices: ACPI and MP
table. With ACPI enabled, the APIC code gets its info from the MADT
table. With ACPI disabled, it uses the MP table. Many older (< 2001)
systems have problems with their MADT but an ok MP table. I think there
are a few systems that have a correct MADT but flawed MP table but that
is rare.
Thanks,
--
Nate
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