System-board switches and jumpers

The following illustrations show the location of the switches and jumpers on the server.

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.

Figure 1. System-board switches

The following table describes the switches on the system board.

Table 1. System-board jumpers
Switches block	Switch number	Switch name	Usage description
Switches block	Switch number	Switch name	On	off
`1` SW2	1	Machine Engine (ME) firmware security override	ME update mode	Normal (default)
`1` SW2	2	N/A	Accessed by technician only	Normal (default)
`2` SW8	1	Password override	Overrides the power-on password	Normal (default)
	2	XClarity Controller force update	Enables XClarity Controller force update	Normal (default)
	3	XClarity Controller boot backup	The node will boot by using a backup of the XClarity Controller firmware	Normal (default)
	4	Low security	Enable low security	Normal (default)
`3` SW1	1	TPM physical presence	Indicates a physical presence to the system TPM	Normal (default)
`3` SW1	2	CMOS clear	Clears the real-time clock (RTC) registry	Normal (default)

The following table describes the jumper on the system board.

Table 2. System-board jumpers
Jumper name	Jumper setting
`4` Serial select jumper	Pins 1 and 2: Send UEFI debug message to serial port (default) Pins 2 and 3: Sends the XCC to the serial port.

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 Information page, Installation Guidelines, Handling static-sensitive devices, and Power off the server.
Any system-board switch or jumper block that is not shown in the illustrations in this document are reserved.

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