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dacaw

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dacaw

Re: None

Wednesday, 06/23/2004 2:50:12 PM

Wednesday, June 23, 2004 2:50:12 PM

Post# of 97775
Microcode Patch Mechanism

AMD has had a processor microcode patch facility in their processors for some time, its in the XP.

You can see here:

http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/27532.pdf

That the model 10 AthlonXP revision A2 actually had a bug in the mechanism that made it unreliable (errata 22).

That there are no listed errata in the Athlon64 microcode patch category suggests to me that it works and that's how a BIOS change will fix the problem. Cheap and easy.

BTW reverse string movs are much rarer than forward string moves and even then they are normally prefaced by a mov ecx, somevalue instruction as the count of the repetition, which is not a microcoded instruction. Thus it is unlikely that the bug would cause real harm compared to software bugs that happen all the time.

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