Disable serial console for Apalis i.MX8

Technical Support
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1

Hello All,

We are using Apalis i.MX8 SOM along with Yocto Project Toradex Reference Multimedia Image for development.
We need to disable login prompt and serial console messages for U-boot as well as Kernel. I am following below article for disabling the serial console.

I have not tried to disable U-boot messages yet.
I tried to disable kernel logs using steps given in the article.
I set tdxargs u-boot environment variable using below commands given in the article.

setenv tdxargs ‘console=null’
saveenv

I also tried to set it from user space.

fw_setenv tdxargs 'console=null

I could see that the tdxargs variable value is set properly. But the serial console and log messages were still active.

Please share your input on this.

Regards,
Prathamesh Kulkarni

2

Hi @prathamesh.kulkarni ,
What is the image version you are using ?
Also share the logs that you are getting after disabling the kernel logs

3

Hi @sahil.tx ,

Sorry for the delay in response.
I have attached log file here.
disable_serial_console_logs.txt (47.0 KB)
I am not sure about where I can find image version.
I found below details about the image.

root@apalis-imx8-06980499:~# cat /etc/os-release
ID=tdx-xwayland
NAME=“TDX Wayland with XWayland”
VERSION=“5.7.1-devel-20231129150039+build.0 (dunfell)”
VERSION_ID=5.7.1-devel-20231129150039-build.0
PRETTY_NAME=“TDX Wayland with XWayland 5.7.1-devel-20231129150039+build.0 (dunfell)”
DISTRO_CODENAME=“dunfell”

root@apalis-imx8-06980499:~# cat /etc/version
20180309123456
root@apalis-imx8-06980499:~#

Regrads,
Prathamesh Kulkarni

4

Hi @sahil.tx ,

Please share your input.

Regards,
Prathamesh Kulkarni

5

Hi @prathamesh.kulkarni ,
Can you check if this works for you

setenv tdxargs ‘${tdxargs} quiet’
saveenv

6

Hi @sahil.tx ,

I checked above command. It does not work for me.

Regards,
Prathamesh

7

Hello @sahil.tx ,

I checked the command again, this time it worked for me. But some how few log lines still appear.
Also, I want to disable login prompt, I am able to disable it by masking getty.target using systemctl.
How can we disable getty.target from Yocto build?

Regards,
Prathamesh Kulkarni

8

Hi @prathamesh.kulkarni ,

This is expected as it gives you very few debug messages but does not disable all.

For disabling serial getty using yocto, can you check this similar post