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BEAGLEBK: PRU pinmux

Paul Steinke
Prodigy 70 points

Part Number: BEAGLEBK

Does the C function system("config-pin P9_41 pruin"); set ...

      P9_41A in pruin / mode 5 to be read by __R31 bit 16      ... or ...
      P9_41B in pruin / mode 6 to be read by __R31 bit 06   ???
>>>  I want it to set the latter, i.e. P9_41B.  instead of the former (because I need to use _PRU0 _R31 bit 16 to read P9_24). 
-------- OR --------
Do I have to use the old device tree method for this?
Reference page 212 of Derek Molloy's Exploring Beaglebone Black book.