GPIOs already in use

It turns out that some of the GPIO ports are already used to configure the boot sequence on the BeagleBone.

So, don't use any of these as inputs:

PinUsed for
GPIO2_6SYS_BOOT0
GPIO2_7SYS_BOOT1 
GPIO2_8SYS_BOOT2 
GPIO2_9             SYS_BOOT3 
GPIO2_10 SYS_BOOT4 
GPIO2_11 SYS_BOOT5 
GPIO2_12 SYS_BOOT6 
GPIO2_13 SYS_BOOT7 
UART5_TXD SYS_BOOT8 
UART5_RXDSYS_BOOT9 
UART3_CTSN SYS_BOOT10 
UART3_RTSN SYS_BOOT11 
UART4_CTSNSYS_BOOT12 
 UART4_RTSNSYS_BOOT13 
 UART5_CTSNSYS_BOOT14 
 UART5_RTSNSYS_BOOT15 

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