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From: "Dariusz Piatkowski"
On Tue, 9 Aug 2011 21:36:12 UTC, "Dariusz Piatkowski"
wrote:
> Jonathan,
>
> On Tue, 9 Aug 2011 09:39:25 UTC, Jonathan de Boyne Pollard
> wrote:
>
> > >> My machine is NOT configured to support ACPI, however, setting my
> > >> BIOS to ACPI enabled and using MPS map 1.4 seems to produce an
> > >> otherwise pretty darn stable system. [...]
> > >
> > > So you have ACPI disabled even though having it enabled is more stable?
> >
> > The last time around, M. Piatkowski said APIC, not ACPI. I pointed out
> > then that xe shouldn't be mixing up xyr initialisms. Disabling the
> > Advanced Configuration and Power Interface is a very different kettle of
> > fish to disabling any use of Advanced Programmable Interrupt
> > Controllers. It's actually the latter that M. Piatkowski is doing.
> >
> > In an AMIBIOS machine, the setting that M. Piatkowski was talking about
> > earlier is named "ACPI APIC Support" and it deals with APICs. In
> > AWARD-Phoenix firmwares, the equivalent setting is named "APIC Mode".
> > It almost goes without saying that if one disables the use of APICs
> > entirely, by setting APIC mode to "disabled", then I/O APICs are as a
> > consequence unavailable. If all local APICs are switched off during
> > POST (as essentially all that this setting has to do), then whatever I/O
> > APICs may do is entirely irrelevant: there is no-one listening to them.
>
> Well...you did bring up an excellent point. I had read your original
response to
> my other post and had intended to respond...however I did encounter a
> soft-freeze and wasn't able to find the posting anymore in my news
reader...???
>
> So here is the response, hopefully if I used the wrong terminology last time
I
> am getting it correct this time...I am in fact using the correct terms as
> applicable to my hardware and in my descriptions I am addressing 2 separate
> issues:
>
> 1) ACPI - replacing APM for example
> 2) APIC - dealing with SMP support and things like advanced programmable IO
> controllers
>
> In the BIOS of my motherboard, which is the MSI 790X-G45 piece, I do in fact
> have 2 such separate settings.
>
> 1) Enabling ACPI also appears to enable the IOAPIC (that's correct),
disabling
> ACPI shuts OFF IOAPIC
>
> 2) SMP related stuff, I believe is really just the MPS table selection of
1.1 or
> 1.4
>
> What I do not know is how enabling ACPI turns on the IOAPIC and how that in
turn
> relates to supporting SMP in OS2.
>
> Here is a link to a mb review, and while it's not the matching model, it is
very
> close: MSI 790FX-GD70, the BIOS screenshots are very close (not the same
> ofcourse for all settings) to what I see for my 790X-G45,
> http://www.hardocp.com/article/2009/08/04/msi_790fxgd70_amd_motherboard/
>
> Specifically, this is AMI BIOS and shows the following:
>
> 1)
> http://www.hardocp.com/image.html?image=MTI0NTM3OTE2NFhVdWJNdT
0MzNfMl80X2wuZ2lm
>
> ...shows the IOAPIC function, it is ONLY present when ACPI has been turned ON
>
> 2)
> http://www.hardocp.com/image.html?image=MTI0NTM3OTE2NFhVdWJNdT
0MzNfMl84X2wuZ2lm
>
> ...shows the ACPI controls
>
> OK...so now given that information, I stand by my earlier conclusion...how
does
> ACPI control the IOAPIC??? Unless, the IOAPIC is only used to support the
ACPI
> functionality and has absolutely nothing to do with SMP.
...something else which I looked up in the BIOS this time, the description for
hte IOAPIC says the following:
'Include ACPI APIC table pointer to RSDT pointer list'
Now...does that make sense, and can you shed some light on this? Google is my
next stop...LOL...
Thanks!
--- Internet Rex 2.31
* Origin: NewsGuy - Unlimited Usenet $19.95 (1:261/20.999)
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