AMD Athlon 6 Revisión - Página 8

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AMD Athlon™ Processor Model 6 Revision Guide

Deadlock May Occur in a Two-Processor System in the Presence of Probe to Memory-

Mapped I/O

Products Affected. A0, A2, A5

Normal Specified Operation. Processor should not hang.

Non-conformance. In a multiprocessor system, if one processor (A) is continuously writing to a cacheable

memory-mapped I/O block while the other processor (B) is trying to read the same cacheable I/O block,

and at the same time both processors are also trying to write a different memory-based cache block,

then processor B may hang. Should this occur and processor A fields an interrupt, the deadlock will be

resolved.

Potential Effect on System. System will hang or exhibit performance degradation.

Suggested Workaround. The current processor design assumes that memory-mapped I/O is incoherent and

does not handle all deadlock cases. System logic should not generate probes for memory mapped I/O

addresses.

Resolution Status. No fix planned.

Preliminary Information

24332E—December 2002