IBM 86594RY - Netfinity 5000 - 4RY, Hardware Maintenance Manual

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System board switches
The following table provides the system switch identifiers
and descriptions of these switches. The system switch
block is identified by key
.3/
in the illustration at “System
board connectors” on page 143.
Note
Turn off the server and disconnect the power cord
before moving any switches.
Note
If the processor in you system does not react to switch
changes, it is not an error.
Table 11. System Board Switch Block SW1
Identifier Switch Description
1 Switches 1, 2, 3, and 4 in combination specify the
frequency for the microprocessor.
See Table 12 on page 148 for details.
2 Switches 1, 2, 3, and 4 in combination specify the
frequency for the microprocessor.
See Table 12 on page 148 for details.
3 Switches 1, 2, 3, and 4 in combination specify the
frequency for the microprocessor.
See Table 12 on page 148 for details.
4 Switches 1, 2, 3, and 4 in combination specify the
frequency for the microprocessor.
See Table 12 on page 148 for details.
5 When On, perform BIOS recovery using boot block (boot
block recovery).
The recovery boot block is in a protected area of flash
memory that cannot be overwritten. When the BIOS
becomes corrupted (for example, if a power failure
occurs during a flash update), the recovery boot block
can be used to restore the BIOS. The code in the
recovery boot block enables the server to start up and
read a flash diskette. The flash utility automatically
recovers the system BIOS from the BIOS recovery files
on the diskette. When the flash is complete, the switch
must be moved to the Off position.
The default setting is Off (disabled).
6 When On, sets the host bus speed to 66 MHz. When
Off, the host bus speed is 100 MHz.
The default setting is Off.
7 Power-on override.
When On, overrides the power-on switch and forces
power-on mode. The system will always boot without
the use of the power-on switch.
The default setting is Off (disabled).
8 When On, bypass the power-on password. When Off,
require the user to enter the power-on password at
startup if one is set.
The default setting is Off.
Netfinity 5000 - Type 8659
147