On Thursday, July 31, 2014 12:39:42 AM UTC+6, Brandon I wrote:
>
> The gpio are push pull/pseudo open drain, so there's a transistor/switch 
> going from 3.3V to the pin,...
>
>
At boot time the respective Sitara pins become outputs high/low level as 
needed.
Then, please never assume your GPIO is tri-state.


In theory you may connect 3.3v power line direct to the pin if:
1) you are sure it is not used at boot time as the output
2) it is 3.3v domain power related pin.

Feel free to ground the pin if:
1) you are sure it is never used at boot time as an output, and you never 
drive it High.


To live safe and feel happy always add pulling resistors, never connect pin 
to the VCC or GND dorectly.

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