Appendix D Dual Boot Block; D-1 Introduction; Bios Boot Block; Bios Boot Block Corruption Occurrence - Supermicro B1SD2-TF User Manual

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 flash 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 jumpers P1-JBR1 and P2-JBR1. When they
are set to pins 2 and 3, the system will boot from a backup boot block pre-loaded
in the BIOS by the manufacturer.
Appendix D
Dual Boot Block
D-1
Appendix D: Dual Boot Block