sn-util on Raspberry Pi Setup Notes
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-Install WiringPi
-To prevent the kernel from using the serial port during boot,
 remove "console=ttyAMA0,115200 kgdboc=ttyAMA0,115200" from the kernel
 command line in /boot/cmdline.txt.
-To prevent a login prompt appearing on the serial port, comment out
 the following line from /etc/inittab:
 T0:23:respawn:/sbin/getty -L ttyAMA0 115200 vt100