Datasheet

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.