Technical Product Specification

Table Of Contents
System BIOS Intel
®
Server Board S5400SF TPS
Revision 2.02
Intel order number: D92944-007
112
4. The system boots from the old BIOS.
5. If the new BIOS needs to be used, power off the system and move the jumper to
cover pins 2 and 3, then power on the system.
6. If the new BIOS is healthy, the system boots with the new BIOS.
or
If the BIOS is corrupted or incompatible, the system does not roll back to the healthy
BIOS. The user should power down the system, move the jumper to cover pins 1 and
2, power up the server to boot to the older BIOS.
5.4.3 BIOS Recovery
Rolling BIOS is the only form of BIOS Recovery for Intel
server boards and systems that use
the Intel
®
5400 Chipset. As discussed in the previous section, any BIOS update that fails to boot
causes the system to automatically roll back to the older, known-good BIOS.
Under some circumstances, a user may choose to force a roll back to the older BIOS. A manual
roll back can be forced by moving the BIOS Select jumper on the server board from the normal
position (covering pins 2 and 3) to the recovery position (covering pins 1 and 2). If a usable
BIOS exists on the secondary partition, the system boots. If the system fails to boot, the user
must manually move the jumper back to the normal position to boot the system from the primary
partition. When the jumper is covering pins 1 and 2, the BIOS does not automatically perform a
roll back.
BIOS updates are supported when the BIOS Select jumper is covering either pins 1 and 2, or
pins 2 and 3. However, normal BIOS updates should be done with the BIOS Select jumper in
the normal position (covering pins 2 and 3). The validation and switch to the BIOS on the
secondary partition occurs only if the BIOS Select jumper is in the normal position. When the
BIOS Select jumper is covering pins 1 and 2, the BIOS update occurs but the server does not
boot to the new BIOS until the user moves the BIOS Select jumper to the normal position.
BIOS updates with the BIOS Select jumper in the recovery position may be required under the
following scenarios:
Initial Conditions: BIOS2 (the new BIOS) is in the active partition and BIOS1 (the old
BIOS) is in the secondary partition.
Trigger Conditions:
- The user successfully updates the BIOS from BIOS1 to BIOS2. The BIOS2 image is
valid and boots successfully, so the primary BIOS makes the switch from BIOS1 to
BIOS2. The user then learns that BIOS2 does not provide the required functionality
and wants to return the server to BIOS1.
- The user changes the system configuration and BIOS2 stops working in some
manner. The user wants to try booting from BIOS1 to see if the results are different.
- The user downloads and flashes in BIOS2. BIOS2 passes the basic checks and
boots, but is not a functional BIOS.
- A power failure occurs during the update from BIOS1 to BIOS2. BIOS2 in the
secondary partition passes the basic checks and the server boots from it. However,