Lenovo x3250 m6 Installation And Service Manual page 37

Figure 11. Switches and jumpers on the system board
1
Clear CMOS jumper
3
TPM physical presence jumper (JP39)
The following table describes the jumpers on the system board.
Table 2. Jumpers definition
Jumper name
Clear CMOS jumper
UEFI boot backup
jumper
TPM physical presence
jumper
If no jumper is present, the server responds as if the pins are set to the default.
Note: Changing the position of the UEFI boot backup 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.
1 2 3
3
2
1
1
2
3
Description
• Pins 1 and 2 (default): Keep the CMOS data.
• Pins 2 and 3: Clear the CMOS data.
• Pins 1 and 2 (default): Load the primary server firmware ROM page.
• Pins 2 and 3: Boot from backup and load the secondary (backup) server firmware
ROM page.
• Pins 1 and 2: Default off
• Pins 2 and 3: Indicates a physical presence to the system TPM
2
UEFI boot backup jumper (JP24)
4
SW1 switch block
Chapter 3
23
.
Component locations