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UEFI boot backup
jumper (J13)
1
2
3
CMOS clear jumper (J11)
1
2
3
Figure 24. System-board switches, jumpers, and buttons
The following table describes the jumpers on the system board.
Table 1. System board jumpers
Jumper number
Jumper name
JP11
CMOS clear jumper
JP13
UEFI boot backup jumper
JP7
System TPM physical
presence jumper
Notes:
1. If no jumper is present, the server responds as if the pins are set to the default.
2. Changing the position of the UEFI boot backup jumper (JP13) 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.
The following table describes the functions of the SW3 switch block on the system
board.
NMI button
Off
On
2
1
System TPM physical
presence switch (SW11)
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 1. The IBM System x3550 M5 server
SW3 switch
block
Off
On
8
7
6
5
4
3
2
1
29
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Troubleshooting
