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VT-SBC-C3558R | User Manual 20
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J3 Flash security override jumper
This jumper is used to enable/disable the BIOS flash. Under normal operations, the flash
descriptor is locked (default). The security measures defined in the flash descriptor will
be in effect. In the override mode, the flash descriptor is unlocked.
Normal mode (default):
Pins 1 and 2 shorted
or
No shorting
Override mode:
Pins 2 and 3 shorted
Note: Asserting Flash Security Override Hard Strap high on the rising edge of RSMRST_N
will also halt Intel ME after SoC bring up and disable runtime Intel ME features. This is a
debug mode and must not be asserted after manufacturing/debug.
•
J4 Clear CMOS jumper
This jumper allows you to clear the CMOS RAM.
Normal mode (default):
Pins 1 and 2 shorted
or
No shorting
Clear CMOS mode:
Pins 2 and 3 shorted
Note: Unless CMOS is being cleared (only to be done in the G3 power state) or the battery
is low, the signal input must always be high when all other RTC power planes are on.
