Below are my queries, Can someone help me on this?


1) Different ways to disable the Serial port.

2) If the setserial command is used to disable the serial port, I am
getting the below error:
a.Cmd: setserial /dev/ttyS0 uart none irq 0 port 0x0 (run as
root user)
Err: Cannot set serial info: Device or resource
busy
What needs to be done for the setserial command to succeed?

3) Is there any chance to disable the serial port using grub
configuration files? What will be impacts in doing so?

4) If agetty process(serial port listening process) is stopped from
being started, what will be the impacts?
agetty is stopped by commenting the lines
in /etc/init/serial.conf