Hello,

Raspberry pi + official latest Raspbian  + owfs 2p15
No problem with the serial port available on GPIO port = ttyAMA0
I have use a MAX3232CPE to adapt Raspberry pi 3.3V to RS232 +12V 
and -12V as shown here:
http://codeandlife.com/2012/07/01/raspberry-pi-serial-console-with-max3232cpe/
Works perfectly 
Don't forget to remove (or comment) the line in inittab using this port,
ttyAMA0 for getty to connect a serial console. Otherwise 2 processes will
try to use the same port, 
I was surprised getty don't put any lock on /var/lock
This is the default Raspbian config allowing to connect a serial console on 
the serial port (BTW works well)
There is also a line in /boot/cmdeline using ttyAMA0 to send kernel boot
message, but this is only at boot.

Cheers
--
Guy


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