System-Board Switches And Jumpers - IBM System x3650 M4 Type 7915 Installation And User Manual

System-board switches and jumpers

The following illustration shows the location and description of the switches and
jumpers.
Note: If there is a clear protective sticker on the top of the switch blocks, you must
remove and discard it to access the switches.
The default positions for the UEFI and the IMM recovery jumpers are pins 1 and 2.
UEFI boot backup
jumper(JP2)
The following table describes the jumpers on the system board.
The following table describes the functions of the SW3 switch block on the system
board.
CMOS clear
jumper (JP1)
Table 3. System board jumpers
Jumper number Jumper name
JP1 CMOS clear jumper
JP2 UEFI boot backup jumper
JP20 System TPM physical
presence jumper
Note: Changing the position of the UEFI boot recovery jumper from pins 1 and 2 to pins 2
and 3 before the server is turned on alters which flash ROM page is loaded. Do not change
the jumper pin position after the server is turned on. This can cause an unpredictable
problem.
System TPM physical
presence jumper(JP20)
Jumper setting
v Pins 1 and 2: Normal (default).
v Pins 2 and 3: Clears the real-time
clock (RTC) registry.
v Pins 1 and 2: Normal (default).
Loads the primary server firmware
ROM page.
v Pins 2 and 3: Loads the secondary
(backup) server firmware ROM page.
v Pins 1 and 2: Normal (default).
v Pins 2 and 3: Indicates a physical
presence to the system TPM.
Chapter 2. Installing optional devices
35