I have been having the same trouble.  I edited /boot/uboot/uEnv.txt and set 
the console to ttyO1 instead of ttyO0 and that seemed to work.  Commenting 
out the line made no difference.

Hope that helps.

Thanks,
Stuart

On Wednesday, January 14, 2015 at 11:38:48 AM UTC-7, Enoch wrote:
>
> Good day to all, 
>
> Can someone please explain how to take over /dev/ttyO0 *permanently* for 
> applications? 
>
> root@beaglebone:~# systemctl status [email protected] 
> [email protected] - Serial Getty on ttyO0 
>           Loaded: loaded (/lib/systemd/system/[email protected]; 
> static) 
>           Active: active (running) since Fri, 31 Dec 1999 19:00:07 
> -0500; 15 years and 0 months ago 
>         Main PID: 625 (agetty) 
>           CGroup: name=systemd:/system/[email protected]/ttyO0 
>                   └ 625 /sbin/agetty -s ttyO0 115200 38400 9600 
>
> root@beaglebone:~# systemctl stop [email protected] 
>
> root@beaglebone:~# systemctl disable [email protected] 
> Failed to issue method call: No such file or directory 
>
> Changing /boot/uboot/uEnv.txt from: "console=ttyO0,115200n8" to 
> "console=ttyO4,115200n8" rendered ttyO0 dysfunctional. 
>
> Thanks, Enoch. 
>
>

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