Disable serial debug console on `/dev/ttyS0`

[galou]

I'm trying to use /dev/ttyS0 (/dev/ttyO0) connected to a half-duplex bus. For the presumed reason that the serial debug console is attached to /dev/ttyS0` I cannot boot the BBBlue when the device is plugged in.

How can I disable the debug serial console? I could not find where all kernel parameters are defined. I was able to add some parameters by fiddling with /boot/uEnv.txt but could not remove the default parameters and dmesg shows me Kernel command line: console=ttyO0,115200n8 ....

Thanks,
Gaël