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)

The following table describes the jumpers on the system board.

Table 1. Jumpers definition

Jumper number	Jumper name	Jumper setting
JP1	Clear CMOS jumper	Pins 1 and 2: Keep CMOS data (default) Pins 2 and 3: Clear CMOS data
JP2	BIOS block backup jumper	Pins 1 and 2: Boot from primary BIOS page (default) Pins 2 and 3: Boot from backup BIOS page
JP8	ME recovery jumper	Pins 1 and 2: Normal (default). Pins 2 and 3: Activate ME recovery.
JP9	ME flash override jumper	Pins 1 and 2: Normal (default). Pins 2 and 3: Override ME flash.
JP10	Trusted Platform Module (TPM) physical presence jumper	Pins 1 and 2: Enable TPM physical presence (default) Pins 2 and 3: Disable TPM physical presence
JP11	TPM initialization jumper	Pins 1 and 2: Normal (default). Pins 2 and 3: Initiate TPM.
JP12	IMM SPI half ROM enable	Pins 1 and 2: Disabled. Pins 2 and 3: Enable IMM SPI half ROM (default).
JP19	Low security_N jumper	Pins 1 and 2: Normal (default). Pins 2 and 3: Activate low security.
Note If no jumper is present, the server responds as if the pins are set to 1 and 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.