Date: Sat, 18 Jan 1997 16:12:37 -0700 From: Steve Passe <smp@csn.net> To: Terry Lambert <terry@lambert.org> Cc: smp@freebsd.org Subject: Re: Adaptec 3940UW and SMP Message-ID: <199701182312.QAA29399@clem.systemsix.com> In-Reply-To: Your message of "Sat, 18 Jan 1997 13:04:04 MST." <199701182004.NAA12315@phaeton.artisoft.com>
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Hi,
>PCI interrupt sharing is (apparently) not corectly supported by the
>APIC I/O. This should be corrected, since non-SMP systems with APIC's
>should probably be running APIC I/O anyway.
I believe the problem here is the one I documented earlier as:
> PnP board failure
>
>PnP boards can cause problems as I have not yet implimented code to "undirect"
>PCI INTs when sent to the APIC. Since an upper ( >15 ) INT is registered
>in place of the original ( <=15 ) the original may be assigned later by
>a PnP card. BUT the lower INT line is NOT un-redirected.
>This means both the PCI hardware (via the redirect hardware) AND the PnP
>card are yanking on the same lower INT line, causing random problems.
>
>solution:
>
>disable the PnP aspects of a board, use the BIOS "legacy ISA" settings.
---
Note his following test:
> The BIOS printout confirmed that the interrupts were assigned as
>follows:
>
>Slot 1: SMC 10/100 (IRQ 11)
^^^^^^^
>Slot 4: Adaptec 3940UW (IRQ 14 for channel 1, IRQ 11 for channel 2)
^^^^^^
>Slot 5: Matrox Millenium (IRQ 14)
>
> And with MP spec v1.4 enabled in the BIOS, I got the following
>results:
>
>Uniprocessor: works fine
>Non-APIC_IO SMP: works fine
>APIC_IO SMP: works fine
APIC PCI INTerrupt sharing is working on the PCI bus.
One genuine problem is when an ISA card trys to re-cycle the unused (but
STILL redirected) PCI INT.
Another is that the info contained in SOME spec 1.1 MP tables is incorrect
is a few unique cases (bridged chips, multiple PCI busses) causing the APIC
to be misprogrammed.
The general solutions are known, its just a matter of finding the
time to impliment them!
--
Steve Passe | powered by
smp@csn.net | FreeBSD
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