Disable rPi console serial

[last updated: 2022-10-06]
go to: rPi serial page
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• to disable default console serial:
  • $ sudo raspi-config
    Actual wording of menu options may be different on different models/software versions.
    Select whatever is closest.
    • select: Interfacing options - configure connection to peripherals
    • select: Serial - Enable/Disable shell & kernel
    • prompt: Would you like a login shell to be accessible over serial? - No -
    • prompt: Would you like the serial port hardware to be enabled? - Yes -
    • message: The serial login shell is disabled
      The serial interface is enabled
    • click OK, then Finish, then reboot

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  Useful commands:

• Find available serial ports:
  $ dmesg | grep tty
  produces this output:
  • [... ...] kernel ...
  • [... ...] console [tty1] enabled
  • [... ...] 20201000.serial: ttyAMA0 at MMIO 0x20201000 (irq = 81, base_baud = 0) is a PL011 rev2
  • [... ...] console [ttyAMA0] enabled

• After disabling default console serial:
  • Being a fumbling newbie, best guess is that what this does is disable the serial signal that goes out the micro-USB port where power is connected?
  • Now doing:
    $ dmesg | grep tty
    produces:
    • [... ...] kernel ...
    • [... ...] console [tty1] enabled
    • [... ...] 20201000.serial: ttyAMA0 at MMIO 0x20201000 (irq = 81, base_baud = 0) is a PL011 rev2

• What serial port to use:
  • In the /dev directory, there are 64 entries starting with 'tty':
    tty, then tty0 - tty63, then ttyAMA0, then ttyprint [or something...]
  • so it appears that /dev/AMA0 is a serial device defined on the system...

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