AMD-768 heads-up

I have a MSI mobo for dual Athlon MP which is based on the AMD 768
chipset.  (MSI K7D-Master).  I have linux as the OS on that machine,
but I've had issues that I think could possibly be pertinent to
OpenBSD as well.  It took me some time to find the info, but there is
an issue with the chipset that is described in the following snip from
the official AMD errata.

> The AMD 768 Revision Guide is at the following URL:
>
> http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/24472.pdf
>
> the erratum #10 is described on page 7 (pstotext output, manually edited):
>
> : 10 Multiprocessor System May Hang While in FULL APIC Mode
> : and IOAPIC Interrupt is Masked
> :
> : Products Affected. B1, B2
> :
> : Normal Specified Operation. The AMD-768 peripheral bus controller is
> : designed to support FULL APIC mode in multiprocessor systems for system
> : management events. If an interrupt is masked in the APIC controller of
> : the AMD-768, then the corresponding interrupt message should not be
> : sent to the processor via the 3-wire APIC bus.
> :
> : Non-conformance. The AMD-768 peripheral bus controller will send an
> : interrupt message via the 3-wire APIC bus regardless if the interrupt
> : is masked or not.
> :
> : Potential Effect on System. Since the processor had previously masked
> : the APIC interrupt, it is not expecting to receive future APIC messages
> : for the masked interrupt. The APIC controller will continuously send
> : the interrupt message via the 3-wire bus until a processor accepts the
> : message, causing the system to hang.
> :
> : A system hang has been observed when executing a server shutdown
> : command in Novell Netware versions 5.0 or 5.1 while using a serial
> : mouse. During the server shutdown sequence, software writes an invalid
> : CPU ID to the IOAPIC redirection table, and the system does not
> : complete the shutdown.
> :
> : Note: No failure has been observed when using a PS/2 mouse.
> :
> : Suggested Workaround. None.
> :
> : Resolution Status: No fix planned. 

Y'all may already have the good habit of checking these type of
documents along the way, but I wanted to point this out since I've
experienced troubles with this very thing.

bc
-- 
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    |   Benjamin A. Collins <[email protected]>   |
    |     http://people.cs.tamu.edu/bcollins/       |
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