Beagler's:
  I just wrote up some notes on how to edit the device tree to change a 
GPIO into an LED.

Switching_a_GPIO_to_an_LED 
<https://elinux.org/EBC_Exercise_17_Switching_a_GPIO_to_an_LED>

It's are rather involved process that requires understanding some deeper 
magic.

Let me know what you think.

--Mark

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