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Subject: Re: MP config table robustness
In-Reply-To: <Pine.BSF.3.96.980318160219.237B-100000@danberlin.resnet.rochester.edu> from Daniel Berlin at "Mar 18, 98 04:03:04 pm"
To: root@danberlin.resnet.rochester.edu (Daniel Berlin)
Date: Sun, 29 Mar 1998 20:39:02 -0600 (CST)
Cc: ejon@colltech.com, Tor.Egge@idi.ntnu.no, freebsd-smp@FreeBSD.ORG
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So, Tor,
	I've been running with this patch for 11 days now and had
no issues with it...any chance you could commit it?

Eric

Strange sunspot activity caused Daniel Berlin to write:
> Hey Tor, looks like the patch does a lot of good.
> Sorry i couldn't get you the other MP table earlier than I did, looks like
> this patch makes a lot of people happy.
> --Dan
> On Wed, 18 Mar 1998 ejon@colltech.com wrote:
> 
> > Tor,
> > 	I could kiss you!  I applied this patch on my recalcitrant
> > DEC Personal Workstation 6200 and acheived my first FreeBSD-SMP
> > boot!  MP 1.4 is not currently an option in my BIOS (doubt if DEC
> > is ever going to get around to updating it again), so this
> > patch probably wins by better supporting us MP 1.1 holdouts.
> > 
> > Anyway, thanks!  I _definitely_ owe you a beer for this.  Next time
> > you're in the Boston area...
> > 
> > Eric
> > 
> > Strange sunspot activity caused Tor Egge to write:
> > > 
> > > I see two problems with the current APIC code
> > > 
> > > 1.  Interrupts on the ISA bus are assumed to be conforming.  When
> > >     PCI interrupts are redirected to the ISA bus, this assumption can
> > >     be wrong.
> > > 
> > > 2.  A PCI interrupt not specified in the MP table as a PCI interrupt
> > >     is treated as a ISA interrupt delivered to the same interrupt
> > >     pin number on the IOAPIC as the ISA interrupt number. This is
> > >     inconsistent with the handling if ISA devices, where the IOAPIC
> > >     pin number doesn't need to be the same as the ISA interrupt number.
> > > 
> > > With a few changes, my -SMP machine (ASUS P6UP65 motherboard) can boot
> > > the -SMP kernel when MP 1.4 is disabled in the BIOS (as long as it has
> > > enough free interrupt to use for the PCI devices).  The same kernel 
> > > also works with MP 1.4 enabled in the bios.
> > > 
> > > This change also seems to help on some versions of SuperMicro motherboards.
> > 
> > 
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> > 
> 
> 
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