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Advanced Micro Devices has released a fix for an erratum that might cause AMD Athlon 64 or AMD Opteron-based computers to hang. The new BIOS version is expected to be distributed among makers of mainboards and personal computers who will then notify their customers about the update.

The erratum that was recently discovered in AMD64 processors may lead to incorrect results in certain situations when a REP MOVS instruction is executed. An incorrect address size, data size or source operand segment may be used or a succeeding instruction may be skipped. This may occur only under certain conditions and may lead to production of incorrect results or system’s freeze, AMD said.

It is not clear whether any real systems have been affected by the erratum after the AMD Opteron processor has been in the market for more than a year.

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