About the development board Jumpers
ConnectCore for i.MX51 Hardware Reference Manual
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Jumpers
Battery enable, J5
When J5 is set, the development board can be powered by an external battery connected to J23.
Module power source, P29
When set on positions 1-2, the 3.3V supply of the development board is generated on the +3.3V power
regulator (U50).
When set on positions 2-3, the +3.3V supply of the development board is generated on the module.
LED 1, J16
When set, enables the User LED 1 (LE51) to show the status of this signal (on if low).