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.
The following table describes the functions of the switches on switch blocks SW3 and SW4.
| Switch number | Description | Definition |
|---|---|---|
| SW3-1 | Password override | The default position is Off. Changing this switch to the On position overrides the power-on password. |
| SW3-2 | Trusted Platform Module (TPM) physical presence | The default position is Off. Changing this switch to the On position indicates a physical presence to the TPM. |
| SW3-3 | Real time clock (RTC) reset | The 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. |
| SW3-4 | Boot backup IMM2 | When the switch is in the default Off position, the compute node will boot by using the primary IMM2 firmware. When the switch is in the On position, the compute node will boot by using a backup of the IMM2 firmware. |
| SW3-5 | Boot backup UEFI | The default position is Off. Changing this switch to the On position forces the compute node to boot from the backup UEFI image. |
| SW3-6 | iBMC force update | The default position is Off. Changing this switch to the On position bypasses the operational firmware image and performs a BMC firmware update, if the normal firmware update procedure results in an inoperative BMC. 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 operation. |
| SW3-7 | Wake on LAN (WOL) disable | The default position is Off. Changing this switch to the On position disables WOL. |
| SW3-8 | Real time management module (RTMM) flash bypass | The default position is Off. Changing this switch to the On position forces the compute node to use RTMM ROM instead of flash. |
| SW4-1 | Serial select | The default position is Off (send the serial input output (SIO) to the front serial port). Changing this switch to the On position sends the IMM2 to the serial port. |
| SW4-2 | ME firmware security override | For debug only. |
| SW4-3 | Future use only | |
| SW4-4 | Future use only |
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