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Intel E7-4850 AT80615007449AA User Manual

Product codes
AT80615007449AA
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Intel
®
 Xeon
®
 Processor E7-8800/4800/2800 Product Families
29
Specification Update
 September 2012
Intel
®
 Xeon
®
 Processor E7-8800/
4800/2800 Product Families BIOS 
ACM Errata
AC1.
BIOS ACM Exit INIT (LockConfig) Call May Fail on Certain IOH Bus 
Configurations
Problem:
With certain IOH bus configurations, the BIOS ACM Exit Init (LockConfig) call may be 
unable to lock the IOHs and the call will fail.
Implication:
When this erratum occurs, the TXT.HEAP.BASE and TXT.HEAP.SIZE registers will be 
locked, and BIOS will be unable to setup TXT heap memory for MLE (Measured Launch 
Environment) boot.
Workaround:
On single IOH configurations, the IOH can use bus 0x00-0x7F to avoid this erratum. On 
dual IOH configurations, IOH0 can use bus 00-0x7F and IOH1 can use bus 0x80-0xF7 
to avoid this erratum. 
Status:
Fixed in BIOS ACM 1.1.