Re: The buggy APIC of the Abit BP6

From: Maciej W. Rozycki (macro@ds2.pg.gda.pl)
Date: Wed Jun 19 2002 - 09:35:46 EST

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On Thu, 20 Jun 2002, Keith Owens wrote:

> You do not have the data required to (a) detect the problem and (b)
> recover even if you could detect the problem. The APIC bus has a
> single bit checksum, the APIC hardware detects single bit errors and
> does a retransmission. It _cannot_ detect double bit errors, the bad
> data is accepted and processed with undefined side effects.

Thanks to the way the checksum is calculated (a two-bit cumulative sum),
about 75% of double-bit errors are detected as well.

-- + Maciej W. Rozycki, Technical University of Gdansk, Poland + +--------------------------------------------------------------+ + e-mail: macro@ds2.pg.gda.pl, PGP key available +

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