Technical Product Specification

Table Of Contents
System BIOS Intel
®
Server Board S5400SF TPS
Revision 2.02
Intel order number: D92944-007
110
5.3 Loading BIOS Defaults
Different mechanisms exist for resetting the system configuration to the default values. When a
request to reset the system configuration is detected, the BIOS loads the default system
configuration values during the next POST. The request to reset the system to the defaults can
be generated in the following ways:
By pressing <F9> from within the BIOS Setup utility.
By moving the clear system configuration jumper. See section 7.1.1 for complete CMOS
Clear instructions.
5.4 Rolling BIOS
The Rolling BIOS feature provides the ability to update the BIOS in a fault tolerant way. If the
updated (new) BIOS is found to be non-functional for any reason, the system can still be booted
by rolling back to the previous, healthy BIOS.
All Intel
®
Server Boards and Systems that use the Intel
®
5400 Chipset have 4 MB of flash space
for the system BIOS. This flash is divided into 2 banks of 2 MB each. One of the banks is called
upper bank and the other is called lower bank. The BIOS can reside in either or both of these
banks. The BIOS area from which the system boots at any point in time is called the “Primary
BIOS Partition”. The other BIOS area (also called the backup area) is called the “Secondary
BIOS Partition”. All BIOS updates are made only to the “Secondary BIOS Partition”.
Note: The primary and secondary BIOS partitions are logical partitions on a 4 MB system flash.
They can reside on either of the two physical banks.
The BIOS relies on specialized hardware and additional flash space for a Rolling BIOS and One
Boot Flash Update. The BIOS Select Jumper is used to direct the behavior of the BIOS once the
online update is performed. The BIOS Select jumper has two modes.
2-3 Normal Operation (Default)
1-2 Recovery Mode