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01-04-2008, 10:12 PM
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 ECC errors - Locating the bad SIMM? We have recently begun logging repeated ECC errors from an old RS/6000, Model 39H with two 64MB memory cards installed (at locations 00-0H and 00-0D). According to the error log, the register values are always the same: LABEL: CORRECTED_SCRUB IDENTIFIER: A6BAD8E6 MEMORY SCRUBBING CORRECTED ECC ERROR SINGLE BIT SIGNATURE/SYNDROME REGISTER 0004 0000 SINGLE BIT STATUS REGISTER 2000 0000 SINGLE BIT ADDRESS REGISTER 01CE 8900 According to an article posted to this newsgroup in 1994 by Milton Miller of IBM Corporation, it should be possible to identify the failing SIMM from this information: http://groups.google.com/groups?selm...twheel.bga.com Quoting from his posted "Scrubbing Mini-FAQ": "What does a scrubbing error indicate: It indicates that an single-bit error that would normally have been corrected while the reading the data was found and good ECC was written back to memory. The syndrome indicates which bit was determined to have the error (determining which simm and/or bitline line involves several table lookups)." Could somebody please point me to a description of how to do this, i.e., how to determine which is the failing SIMM via table lookups? Thanks. -- Ken Bell :: kenbell@panix.com :: (212) 475-4976 (voice)      |
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