System board switches

Use this information to locate the system board switches.

Important

Read Installation guidelines to ensure that you work safely.
Prevent exposure to static electricity, which might lead to system halt and loss of data, by keeping static-sensitive components in their static-protective packages until installation, and handling these devices with an electrostatic-discharge wrist strap or other grounding system.
Turn off the server before you move the switches; then, disconnect all power cords and external cables. Do not open your server or attempt any repair before reading and understanding the following information:
Any system board switch that is not shown in the illustrations in this document are reserved.

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

Table 1. System board switches
`1` SW3 switch block	`2` SW2 switch block

Table 2. SW2 switch block definition
Switch number	Default position	Description	Definition
8	Off	Trusted Platform Module (TPM) physical presence	Changing this switch to the On position indicates a physical presence to the TPM.
7	Off	ME recovery	Changing this switch to the On position boots ME to recovery
6	On	Low security	Keeping this switch in the On position allows transitioning between signed official IMM builds and IMM test signed builds, and bypasses CRTM boot check of iMM firmware.
5	Off	Real time clock (RTC) reset	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.
4	Off	Password override	Changing this switch to the On position overrides the power-on password.
3	Off	Serial function selection	Off: function as system serial port. On: dump UEFI debug message to serial port.
2	Off	BMC Remote debug	Keeping this switch in the off position enables BMC remote debug.
1	Off	ME security override	Changing this switch to the On position disables ME Security checks.

Table 3. SW3 switch block definition
Switch number	Default position	Description	Definition
8	Off	Force BMC and CPU reset	Changing this switch to the On position forces BMC and CPU reset.
7	On	Power permission override	Changing this switch to the Off position ignores Power Permission and allows the system to power-on.
6	Off	Trusted Platform Module (TPM) physical presence	Changing this switch to the On position indicates a physical presence to the TPM.
5	Off	BMC boot primary	Off: XCC boots from upper half of flash region. On: XCC boots from lower half of flash region.
4	Off	Force XCC reset	Changing this switch to the On position forces XCC into reset.
3	Off	IMM force update	Changing this switch to the On position forces XCC to boot from kernel code only.
2	Off	XCC Trusted Platform Module (TPM) physical presence	Changing this switch to the On position indicates a physical presence to the XCC TPM.
1	Off	Force FPGA reset	Change this switch to the On position forces FPGA into reset.

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