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System-board switches and jumpers

The following illustration shows the location and description of the switches, jumpers, and buttons.

Important
  1. Before you change any switch settings or move any jumpers, turn off the server; then, disconnect all power cords and external cables. Review the information in Safety, Installation guidelines, and Turning off the server.
  2. Any system-board switch or jumper block that is not shown in the illustrations in this document are reserved.
  3. If there is a clear protective sticker on the top of the switch blocks, you must remove and discard it to access the switches.
Figure 1. Location of the switches, jumpers, and buttons on the system board. (cy1cd021a)
Location of the switches, jumpers, and buttons on the system board

The following table describes the jumpers on the system board.

Table 1. Jumpers definition
Jumper numberJumper nameJumper setting
JP1Clear CMOS jumper
  • Pins 1 and 2: Keep CMOS data (default)
  • Pins 2 and 3: Clear CMOS data
JP2BIOS block backup jumper
  • Pins 1 and 2: Boot from primary BIOS page (default)
  • Pins 2 and 3: Boot from backup BIOS page
JP8ME recovery jumper
  • Pins 1 and 2: Normal (default).
  • Pins 2 and 3: Activate ME recovery.
JP9ME flash override jumper
  • Pins 1 and 2: Normal (default).
  • Pins 2 and 3: Override ME flash.
JP10Trusted Platform Module (TPM) physical presence jumper

Pins 1 and 2: Enable TPM physical presence (default)

Pins 2 and 3: Disable TPM physical presence

JP11TPM initialization jumper
  • Pins 1 and 2: Normal (default).
  • Pins 2 and 3: Initiate TPM.
JP12IMM SPI half ROM enable
  • Pins 1 and 2: Disabled.
  • Pins 2 and 3: Enable IMM SPI half ROM (default).
JP19Low security_N jumper
  • Pins 1 and 2: Normal (default).
  • Pins 2 and 3: Activate low security.
Note
  1. If no jumper is present, the server responds as if the pins are set to 1 and 2.
  2. Changing the position of the boot block 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.