The schematics for the Arduino board and the Mini-Breakout board are available at Software & Documentation. Here's a direct URL for the schematic for the Mini-Breakout board: MINI_EDISON_BREAKOUT_HVM_8_26.pdf. Refer to sheet 7 of the schematic for how to properly pull-up GPI_PWRBTN_N. The pin connects to an active low power button input on the PMIC so you definitely don't want to leave that pin floating.
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