The SABRE Board schematic Rev. C5 Sheet 19 shows a diode D4 is connected from the Power Button SW1 to the PWR_BTN_SNS net that goes to EIM_D29 on the iMX6. Can anyone say:
* What is the purpose of this diode connection?
* Is EIM_D29 configured as a GPIO input with a pull-up resistor?
The QWKS board schematic Rev. C shows a similar diode D2 to EIM_A25.