I have one (rev A2, I think) and I want to access GPIO.

Is there a good, relatively complete source of info on how to do this?  I 
see some things for the BeagleBoneBlack, but very little for the BB -xM.   
Are the instructions identical?  For example, for the BBB there is some 
calculation that has to be done to associate a pin with the "device" 
exposed by the kernel.  Is it done differently on the BB?

I also see a lot of short instructions like "change the MUX for the pin in 
the device tree".    I need to know what the device tree is, and how to 
change the MUX there.

I really need some basic information about how this works, preferably in 
one (or a few) places.  Thanks.

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