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System-board switches

Use this information to locate the system-board switches.

The following illustration shows the location of the switch block on the system board.


Graphic illustrating system board switches

The following table describes the functions of the switches on switch block SW8, the NMI button, and the power button.

Table 1. System-board switches.

SwitchDescriptionSwitch settingDefinition
SW8-1Password overrideThe default position is Off.Changing this switch to the On position overrides the power-on password.
SW8-2Trusted Platform Module (TPM) physical presenceThe default position is Off.Changing this switch to the On position indicates a physical presence to the TPM.
SW8-3Real time clock (RTC) resetThe default position is Off.Changing this switch to the On position resets the RTC. A momentary toggle is all that is required. To avoid excessive CMOS battery drain, do not leave this switch in the On position.
SW8-4Boot backup IMM2 uBootThe default position is Off.When the switch is in the Off (default) position, the compute node will boot by using the primary IMM2 uBoot firmware. When the switch is in the On position, the compute node will boot by using a backup of the IMM2 firmware.
SW8-5Boot backup UEFIThe default position is Off.Changing this switch to the On position forces the compute node to boot from the backup UEFI image.
SW8-6Boot IMM2 recovery partitionThe default position is Off.The IMM2 recovery partition is loaded by changing this switch to the On position and moving the low Security (CN45) jumper to pins 1 and 2.
Note
Use this jumper only if the normal firmware update procedure fails and the operational firmware image is corrupted. Use of this jumper disables normal baseboard management controller (BMC) operation.
SW8-7Wake on LAN (WOL) disableThe default position is Off.Changing this switch to the On position disables WOL.
SW8-8Real time management module (RTMM) flash bypassThe default position is Off.Changing this switch to the On position forces the compute node to use RTMM ROM instead of flash.
NMI button The default position is Off.Pressing this recessed button causes the compute node to stop doing what it is doing.
Power button The default position is Off.Pressing this button turns on or turns off the compute node.