serial plugin not able to disable shell console about sdm HOT 14 CLOSED

Will have a look. The plugin with no arguments should disable the console on the serial port.

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Yep, nice buglet! Will be fixed in V11.8.

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thanka

from sdm.

Fixed in V11.8. Please verify.

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so finally was able to look at this.
i'm seeing the following in boot/firmware/config.txt
enable_uart=1
i'm seeing /dev/ttyS0 usually it shows as /dev/ttyAMA0 going through raspi-config
i cannot connect over serial and lsof is showing me nothing.

it seems to be working other than the different device name.

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What Pi model are you using this on?

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verifying it on: Raspberry Pi Zero 2 W Rev 1.0

from sdm.

Thx. Will check it out.

from sdm.

I think ttyAMA* is not created by raspi-config any more, in favor of ttyS0

That said, I mis-read raspi-config a bit, so was not disabling the uart, hence enable_uart=1

This will be fixed in next release, and adding a new argument enableuart, in case you want the shell disabled, and the uart enabled. 🤷‍♂️

from sdm.

I'm running the latest version of the OS.
https://downloads.raspberrypi.com/raspios_lite_arm64/images/raspios_lite_arm64-2024-03-15/

now i don't know all the ins and outs but in manually configuring from raspi-config i get the following:

serial disabled
console disabled

tcronin@tec-zero:~ $ ls -l /dev/ttyS0
crw-rw---- 1 root dialout 4, 64 Apr 29 20:50 /dev/ttyS0
tcronin@tec-zero:~ $ ls -l /dev/ttyAMA0
ls: cannot access '/dev/ttyAMA0': No such file or directory
tcronin@tec-zero:~ $ ls -l /dev/serial0
ls: cannot access '/dev/serial0': No such file or directory

/boot/firmware/config.text
enable_uart=0

tcronin@tec-zero:~ $ sudo lsof /dev/ttyS0
tcronin@tec-zero:~ $

serial enabled
console disabled

tcronin@tec-zero:~ $ ls -l /dev/ttyS0
crw-rw---- 1 root dialout 4, 64 Apr 29 20:56 /dev/ttyS0
tcronin@tec-zero:~ $ ls -l /dev/ttyAMA0
crw-rw---- 1 root dialout 204, 64 Apr 29 20:56 /dev/ttyAMA0
tcronin@tec-zero:~ $ ls -l /dev/serial0
lrwxrwxrwx 1 root root 7 Apr 29 20:56 /dev/serial0 -> ttyAMA0

/boot/firmware/config.text
enable_uart=1

tcronin@tec-zero:~ $ sudo lsof /dev/ttyS0
tcronin@tec-zero:~ $ sudo lsof /dev/ttyAMA0
tcronin@tec-zero:~ $

serial enabled
console enabled

/boot/firmware/cmdline.txt
added: console=serial0,115200

tcronin@tec-zero:~ $ sudo lsof /dev/ttyS0
tcronin@tec-zero:~ $ sudo lsof /dev/ttyAMA0
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
agetty 668 root 0u CHR 204,64 0t0 132 /dev/ttyAMA0
agetty 668 root 1u CHR 204,64 0t0 132 /dev/ttyAMA0
agetty 668 root 2u CHR 204,64 0t0 132 /dev/ttyAMA0

from sdm.

Thanks. I started with a fresh, unadulterated IMG the same as the one you used on a Pi2W. When it booted:

• No /dev/ttyS0
• No /dev/ttyAMA*
• no UART in config.txt

Used raspi-config to enable and rebooted

• console=serial0,115200 in cmdline.txt
• enable_uart=1 in config.sys
• /dev/serial0 is a link to /dev/ttyS0

Used raspi-config to disable and rebooted

• cmdline.txt and config.txt reverted to no console=serial0 and enable_uart=0

Curiously, no sign of /dev/ttyAMA* during any of these steps. Wonder how you got it?

Then used a lightly customized IMG and burned it with --plugin serial

• Serial port was disabled

Next used that same lightly customized IMG and burned with --plugin serial:enableshell

• Serial port shell was correctly enabled as with raspi-config
• Again, no sign of /dev/ttyAMA*

So, I believe this will work correctly in the next sdm release, targeting it for later this week. 🤞

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most of my knowledge on this is googling, so not sure why as long as i can use serial gpio. Currently for a gps hat for a time server im trying to set up.
some cursory googling gives me this, still not clear on why the different name for the same port
https://unix.stackexchange.com/questions/307390/what-is-the-difference-between-ttys0-ttyusb0-and-ttyama0-in-linux

thanks again for the quick responses

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I believe this is corrected in V12.0. Please test.Thx!

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Closing due to no activity. @tim-oe please reopen if needed. Thx

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