System-Board Switches And Jumpers - IBM System x3300 M4 Installation And Service Manual

System-board switches and jumpers

The following illustration shows the jumper locations.
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.
The following table describes the jumper on the system board.
Table 4. System board jumpers
Jumper
number
ME_UPDATE PCH ME firmware update
Clear CMOS
SPI-WP
UEFI
Boot_Backup
Jumper name
CMOS clear jumper
UEFI flash write protection
UEFI boot - block selection
Jumper setting
v Pins 1 and 2: Normal mode (default)
v Pins 2 and 3: Force update mode
v Pins 1 and 2: Normal mode (default)
v Pins 2 and 3: Clear CMOS
v Pins 1 and 2: GPIO controls write
protection (default)
v Pins 2 and 3: Force write protection
v Pins 1 and 2: Boot normal (default)
v Pins 2 and 3: Boot backup
Chapter 2. Installing optional devices
31