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Product Errata 73

Revision Guide for AMD Athlon™ 64 and AMD Opteron™ Processors

25759 Rev. 3.79 July 2009

113 Enhanced Write-Combining Feature Causes System Hang

Description

The enhanced write-combining feature provides up to four write-combining buffers, but a potential

stall condition can occur when write combining into all four buffers with this feature enabled.

Potential Effect on System

System hang.

Suggested Workaround

Disable the enhanced write-combining feature by setting BU_CFG.WbEnhWsbDis (bit 48 of MSR

C001_1023h). This reduces the number of available write-combining buffers from four to one.

Fix Planned

Yes

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AMD Athlon 6 Specifiche Pagina 73