After booting Debian for Beaglebone Black I looked at P9 pin 12 (GPIO 1 28) 
on an oscilloscope, their is a positive 65ms wide positive pulse that 
repeats approximately every second. 

Is this pin not set up as a GPIO pin? 

I tried 

echo 60 > /sys/class/gpio/export


However when I tried 

ls -al /sys/class/gpio


after this gpio60 did not show up. 

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