Errata
42 Intel
®
Core™2 Extreme Processor X6800 and
Intel
®
Core™2 Duo Desktop Processor E6000 and E4000 Sequence
Specification Update
AI55. Using Memory Type Aliasing with Memory Types WB/WT May Lead to
Unpredictable Behavior
Problem: Memory type aliasing occurs when a single physical page is mapped to two or
more different linear addresses, each with different memory type. Memory
type aliasing with the memory types WB and WT may cause the processor to
perform incorrect operations leading to unpredictable behavior.
Implication: Software that uses aliasing of WB and WT memory types may observe
unpredictable behavior.
Workaround: It is possible for the BIOS to contain a workaround for this erratum.
Status: For the steppings affected, see the Summary Tables of Changes.
AI56. Update of Read/Write (R/W) or User/Supervisor (U/S) or Present
(P) Bits without TLB Shootdown May Cause Unexpected Processor
Behavior
Problem: Updating a page table entry by changing R/W, U/S or P bits without TLB
shootdown (as defined by the 4 step procedure in "Propagation of Page Table
and Page Directory Entry Changes to Multiple Processors" In volume 3A of the
IA-32 Intel
®
Architecture Software Developer's Manual), in conjunction with a
complex sequence of internal processor micro-architectural events, may lead
to unexpected processor behavior.
Implication: This erratum may lead to livelock, shutdown or other unexpected processor
behavior. Intel has not observed this erratum with any commercially available
system.
Workaround: None Identified.
Status: For the steppings affected, see the Summary Tables of Changes.
AI57. BTS Message May Be Lost When the STPCLK# Signal is Active.
Problem: STPCLK# is asserted to enable the processor to enter a low-power state.
Under some circumstances, when STPCLK# becomes active, the BTS (Branch
Trace Store) message may be either lost and not written or written with
corrupted branch address to the Debug Store area
Implication: BTS messages may be lost or be corrupted in the presence of STPCLK#
assertions.
Workaround: None Identified.
Status: For the steppings affected, see the Summary Tables of Changes.
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