Specifications

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