Table 14. System-board jumpers
Switches block Switch number Switch name
Usage description
On off
1 SW2
1 Machine Engine
(ME) firmware
security override
ME update mode
Normal (default)
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)
2
CMOS clear Clears the real-time clock
(RTC) registry
Normal (default)
The following table describes the jumper on the system board.
Table 15. 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:
1. 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
http://thinksystem.lenovofiles.com/help/topic/
safety_documentation/pdf_files.html
, “Installation Guidelines” on page 37, “Handling static-sensitive
devices” on page 39
, and “Power off the server” on page 16.
2. Any system-board switch or jumper block that is not shown in the illustrations in this document are
reserved.
PCIe riser assembly
Use this information to locate the connectors on the PCIe riser assembly.
Chapter 2. Server components 27
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