System-board switches and jumpers

This section describes the switches and jumpers on the system board.

The following illustration shows the jumper locations.

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 following table describes the jumper on the system board.

Table 1. System board jumpers
Jumper number	Jumper name	Jumper setting
ME_UPDATE	PCH ME firmware update	Pins 1 and 2: Normal mode (default) Pins 2 and 3: Force update mode
Clear CMOS	CMOS clear jumper	Pins 1 and 2: Normal mode (default) Pins 2 and 3: Clear CMOS
SPI-WP	UEFI flash write protection	Pins 1 and 2: GPIO controls write protection (default) Pins 2 and 3: Force write protection
UEFI Boot_Backup	UEFI boot - block selection	Pins 1 and 2: Boot normal (default) Pins 2 and 3: Boot backup
LPC_TPM_PP	Host TPM physical presence	Pins 1 and 2: physical presence off (default) Pins 2 and 3: physical presence on Note TPM physical presence is asserted. (ON) TPM physical presence is not asserted (default off). Note: The physical presence requires manual setting on the server to change the TPM configuration. The TPM is enabled and physical presence is not asserted by default. The physical presence needs to be asserted to activate, deactivate, clear or change ownership of the TPM.
TPM_PP	iMM TPM physical presence	Physical presence off (default) Physical presence on Note The physical presence requires manual setting on the server to change the TPM configuration. The TPM is enabled and physical presence is not asserted by default. The physical presence needs to be asserted to activate, deactivate, clear or change ownership of the TPM.
SW1-1	Host TPM physical presence	Physical presence off (default) Physical presence on Note The physical presence requires manual setting on the server to change the TPM configuration. The TPM is enabled and physical presence is not asserted by default. The physical presence needs to be asserted to activate, deactivate, clear or change ownership of the TPM.
SW1-2	PASSWORD_OVERRIDE_N	Power-on password override when on (default off)
SW1-3	IMM_FORCE_UPDATE_N	Default off
SW1-4	FORCE_IMM_RESET_N	Default off
SW2-1	FORCE_RTMM_RESET_N	Default off
SW2-2	RTMM FLASH	Default off
SW2-3	POWER_PERMISSION_N	Force power permission (default off when F/W is ready)
IMM_SPI_EN	IMM_SPI_HALF_ROM_EN_N	To allow override of the boot half (Default: jumper open)
Note If no jumper is present, the server responds as if the pins are set to 1 and 2. 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. The physical presence requires manual setting on the server to change the TPM configuration. The TPM is enabled and physical presence is not asserted by default. The physical presence needs to be asserted to activate, deactivate, clear or change ownership of the TPM.

Important:

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 and Installation guidelines, Handling static-sensitive devices, and Turning off the server.
Any system-board switch or jumper blocks that are not shown in the illustrations in this document are reserved.

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