PC4-PRESTO • CompactPCI
®
PlusIO • 4
th
Generation Intel
®
Core™-4xxx Processor
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 PC4-PRESTO stores most of its settings in an area within the 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 BIOS. To
reset the settings mount a jumper on J-GP and perform a system reset. As long as the jumper is
stuffed the 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
®
PlusIO connector J2 pin D14 (SATA-SCL)
also.
J-GP
Function
Jumper Removed
1)
Normal operation
Jumper Installed
BIOS configuration reset performed
1)
This setting is the factory default
1
J-GP
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