I wasn't able to find one.  I believe it's built in to the hardware of 
http://www.ti.com/lit/ds/symlink/tps65217.pdf
Feel free to review and see if you come to the same conclusion that I did!

Cheers,
Alex

On Monday, January 2, 2017 at 2:29:31 AM UTC-5, Heinz Hummel wrote:
>
> Great - thanks! So there is no way to do that programmatically via PMIC?
>
> 2016-12-29 8:59 GMT+01:00 Alex Hayman <[email protected] <javascript:>>
> :
>
>> If you cut that trace on a BBB, then the BBB won't power itself up via 
>> USB.
>>
>> On Friday, December 23, 2016 at 4:25:08 AM UTC-5, Heinz Hummel wrote:
>>>
>>> Hello,
>>>
>>> I have a BBB which is currently powered via USB and external power 
>>> supply (and a similar BBG which is powered via USB and via external supply 
>>> feed into VDD from connected cape).
>>>
>>> Now when a user wants to do a full power cycle, all possible power 
>>> sources have to be disconnected which can be somewhat complicated.
>>>
>>> So my question: is there a possibility to disable power supply via USB? 
>>> E.g. a soldering jumper which has to be opened? Or in case not - is there a 
>>> possibility to permanently program the PMIC to not to power the board from 
>>> USB?
>>>
>>> Thanks!
>>>
>>> -- 
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