Messages in this thread | | | Date | Wed, 19 Jun 2002 16:35:46 +0200 (MET DST) | From | "Maciej W. Rozycki" <> | Subject | Re: The buggy APIC of the Abit BP6 |
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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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