User Guide • SC4-CONCERTO • CompactPCI
®
Serial CPU Board
Configuration Jumpers
Loading UEFI/BIOS Setup Defaults/IEEE 1588 Pulse per Second (J-GP)
The jumper J-GP may be used to reset the UEFI/BIOS configuration settings to a default state. The
UEFI/BIOS on SC4-CONCERTO stores most of its settings in an area within the UEFI/BIOS flash, e.g. the
actual boot devices. Using the jumper J-GP is only necessary, if it is not possible to enter the setup of
the UEFI/BIOS. To reset the settings mount a jumper on J-GP and perform a system reset. As long as
the jumper is stuffed the UEFI/BIOS will use the default configuration values after any system reset. To
get normal operation again, the jumper has to be removed.
There is also an alternate function available on J-GP. Pin 1 of this jumper carries a Pulse per Second
(PPS) signal according the IEEE 1588 specification when enabled by UEFI/BIOS settings. A wire may be
connected to trigger events on external devices.
NOTE: The PPS signal can be gripped at the
CompactPCI
®
Serial connector P1 pin J3 (SATA-SCL) also.
J-GP
Function
Jumper
Removed
1)
Normal operation
Jumper Installed
UEFI/BIOS configuration reset
performed
1)
This setting is the factory default
J-GP
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