Specifications

20 Product Errata
25759 Rev. 3.79 July 2009
Revision Guide for AMD Athlon™ 64 and AMD Opteron™ Processors
1 Inconsistent Global Page Mappings Can Lead to Machine Check
Error
Description
If the same linear to physical mapping exists in multiple CR3 contexts, and that mapping is marked
global in one context and not global in another context, then a machine check error may be reported
by the TLB error detection logic (depending on the specific access pattern and TLB replacements
encountered).
Potential Effect on System
In the somewhat unlikely event that all required conditions are present (including the effects of the
TLB replacement policy), then an unexpected machine check error may be reported. If the erratum
occurs in the instruction cache TLB (L1 or L2), the apparent error is logged and corrected. If the
erratum occurs in the data cache TLB (L1 or L2), the apparent error is logged and reported as an
uncorrectable machine check error.
Suggested Workaround
None required. This is not expected to occur in real systems.
Fix Planned
No