Disabling serial console/kernel messages on Pi B 2 while still being able to write/read to serial port

Question

I would like to disable the serial console and boot up messages while still being able to write to the port.

I have tried disabling the port in raspi-config. This disables the console and the kernel messages but also removes /dev/ttyAMA0, which my code is writing to.

In my application, I am writing to the port using Node and the SerialPort npm package.

I'm using a Raspberry Pi 2 Model B, and the 2016-05-27 version of Raspian Jessie.

Answer 1

Edit /boot/cmdline.txt using sudo nano /boot/cmdline.txt or your preferred method, and delete console=serial0, 115200.

If you are using an older version of Raspbian, you might need to delete console=ttyAMA0, 115200 instead.

After this, reboot and if you do ls /dev you should still see /dev/ttyAMA0. This worked for my Pi 2 running Raspbian Jessie Lite, which shouldn't be any different from Jessie in this aspect.

NOTE:

Be sure not to delete console=tty1.

Answer 2

The answer by @patrick-cook will work, but if you disabled console in raspi-config and rebooted this should already have done the same thing.

Something else may be in play. Possibilities include copying from a Pi3 which disables the default serial port by default through enable_uart in config.txt. (This is likely to become the default in newer releases.)

In any event you should no longer use /dev/ttyAMA0 but /dev/serial0 which is the default serial port on all models.