Appendix D: Dual Boot Block
D-1
Appendix D
Dual Boot Block
D-1 Introduction
This motherboard supports the Dual Boot Block feature, which is the last-ditch
mechanism to recover the BIOS boot block. This section provides an introduction
to the feature.
BIOS Boot Block
A BIOS boot block is the minimum BIOS loader required to enable necessary
hardware components for the BIOS crisis recovery ash that will update the main
BIOS block. An on-call BIOS boot-block corruption may occur due to a software
tool issue (see image below) or an unexpected power outage during BIOS updates.
BIOS Boot Block Corruption Occurrence
When a BIOS boot block is corrupted due to an unexpected power outage or a
software tool malfunctioning during BIOS updates, you can still reboot the system
by closing pins 2 and 3 using a cap on Jumper JBR1. When JBR1 is set to pins
2 and 3, the system will boot from a backup boot block pre-loaded in the BIOS by
the manufacturer.
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AMI Firmware Update Utility vX.XX.XX
Copyright (C)XXXX American Megatrends Inc. All Rights Reserved.
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Reading flash . . . . . . . . . . . . . . . . . . . . . . done
-- ME Data Size checking . ok
-- FFS checksums . . . . . . . . ok
Erasing Boot Block . . . . . . . . . . . done
__Updating Boot Block . . . . . . . . 0x00A91000 (13%)
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