I have fought this same problem, thought it was resolved, and found it again. I think the authoritative answer is in this TI app note: https://www.ti.com/lit/an/slva901/slva901.pdf?ts=1597613555964&ref_url=https%253A%252F%252Fwww.google.com%252F
Cutting to the chase, either ground the BAT terminal with 1K-ish resistor or power your product exclusively through the BAT terminal. In my case, I tried to use both Vin and VUSB with an external battery and charger, plugging and unplugging the charger would cause a brief brownout condition that would lock up the PMIC and require the power to be removed before you could turn it on again. According to the TI doc, the PMIC was really designed for battery as the primary power source, so not having a battery plugged in leads to some imperfect results -- like not being able to turn the stupid thing on. I'm now just using BAT and things appear to work. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/ea03ffab-1465-4961-a07a-7706911fbb2do%40googlegroups.com.
