TDA4VMXEVM: [U-Boot] Disable U-Boot console output (silent boot)

Lukasz Folwarczyk

Intellectual 675 points

Part Number: TDA4VMXEVM

Hello,

I’d like to disable kernel and filesystem logs during system booting, to do so I’ve done following steps:

Set-up: TDA4VMXEVM, ti-processor-sdk-linux-automotive-j7-evm-06_01_00_05, booting from SD Card

Approach 1

Changing u-boot env during start-up.

Result:

Logs are sitll available after reboot.

Details:

From u-boot console:

=> setenv console /dev/null

=> saveenv

=> reset

Starting kernel ...

I get some kernel logs in normal „readable” form, but after some time logs are being displayed in binary-like format.

Approach 2 :

Recompiling u-boot with CONFIG_SILENT_CONSOLE define.

Result:

The system does not boot-up, it finishes with errors.

Details:

$ cd ti-processor-sdk-linux-automotive-j7-evm-06_01_00_05

$ make u-boot_clean

$ make u-boot

$ cd board-support/u-boot-2019.01+gitAUTOINC+66126341c8-g66126341c8/configs/

edit j721e_evm_a72_defconfig (add CONFIG_SILENT_CONSOLE=y)

$ cd ../../../

$ make u-boot_clean

$ make u-boot

copy u-boot.img, tispl.bin from board-support/u-boot_build/a53/ to sd-card/boot

copy tiboot3.bin from board-support/u-boot_build/r5/ to sd-card/boot

(I’ve also tried to copy different combination of these files)

Is there any other, working way to disable kernel and filesystem logs during system booting? Do I do any mistake in one of the described above approaches?

Best regards,

Lukasz

over 5 years ago

0 Yordan Kamenov over 5 years ago

TI__Mastermind 42515 points

Hi Lukasz,

when you try with "CONFIG_SILENT_CONSOLE=y" (Approach 2) can you try to run also the following command on the u-boot prompt:

setenv silent

and see if it works?

Regards,

Yordan

0 Lukasz Folwarczyk over 5 years ago in reply to Yordan Kamenov

Intellectual 675 points

Hello Yordan,

Thank you for your response.

That's exactly what I wanted to do as the next step, unfortunately I'm not able to do it.

As I've mentioned the system doesn't boot-up after the boot files are replaced, the following error is being displayed.

So the u-boot console does not occur.

Regards,

Lukasz

0 Keerthy J over 5 years ago in reply to Lukasz Folwarczyk

TI__Guru**** 169020 points

Hi Lukasz,

Thread title talks about u-boot console output disabling & description says kernel/filesystem.

I just want to know the exact scenario you need to get working. Can you elaborate please?

- Keerthy

0 Lukasz Folwarczyk over 5 years ago in reply to Keerthy J

Intellectual 675 points

Hello Keerthy,

Thank you for your response.

What I want to achieve is to disable all logs which are being printed on the serial console after a system reboot, so neither kernel log nor u-boot log is displayed in my desired scenario.

Only a login prompt should be displayed on the serial console after a system reboot.

Regards,

Lukasz

0 Keerthy J over 5 years ago in reply to Lukasz Folwarczyk

TI__Guru**** 169020 points

Hi Lukasz,

There are no explored ways to disable prints from filesystem. I was successful
in disabling the kernel prints by setting boot argument loglevel=0 & also if you
have earlycon in the bootargs please remove that.

u-boot is something that i will try to do more experiments with. In the meantime
can you try the above if that helps remove kernel traces on your side?

Best Regards,
Keerthy

0 Lukasz Folwarczyk over 5 years ago in reply to Keerthy J

Intellectual 675 points

Hello Keerthy,

Thank you for your support and suggestion. It solves the problem partially, but it's really appreciated to get some hints from you.

Best regards,

Lukasz

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TDA4VMXEVM: [U-Boot] Disable U-Boot console output (silent boot)