IBM BladeCanter HS20, Installation And User Manual

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Switches and jumpers
The following illustration shows the location of the switches and jumpers on the
system board.
Switch block
(SW2)
1
2
3
4
5678
OFF
BIOS code page
jumper (J12)
123
4
5
6
7
8
O F
F
3 2 1
3 2 1
2-1
Normal
3-2
Backup
Light Path
Diagnostics
button
(SW4)
Reserved
(SW3)
Switches
Table 1 describes the function of each switch on switch block (SW2).
Table 1. Switch block (SW2)
Switch
number Default value
Switch
description
1 through 7 Off Reserved.
8 Off Power-on password override. Changing the position of this switch bypasses the
power-on password check the next time the blade server is turned on and starts the
Configuration/Setup Utility program so that you can change or delete the power-on
password. You do not need to move the switch back to the default position after the
password is overridden. See “Using passwords” on page 48 for additional
information about the power-on password.
Jumpers
When the BIOS code page jumper (J12) is moved from pins 1 and 2 to pins 2 and
3, you can start the blade server from a backup BIOS page. The default position is
pins 1 and 2. See the blade server
Hardware Maintenance Manual and
Troubleshooting Guide on the IBM BladeCenter Documentation CD for complete
details.
Note: If you start the blade server from the backup page because the primary
BIOS page has become damaged, you need to flash the primary BIOS code.
Chapter 1. Introduction
11