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PROCESSOR-SDK-AM62A: log file directory

Ryuuichi machida
Guru 12650 points
Part Number: PROCESSOR-SDK-AM62A
Other Parts Discussed in Thread: SK-AM64B

Hello,

I'm looking for where dmesg file is located in linux SDK.
In my understanding, this file is located in /var/log directory.
However, there is no dmesg file in this direcory on Linux SDK ver 09.01.00.07.

Q1. Do you have information which directory this file is located ?
Q2. Is it possible to change directory which user desire ?

BR,

  • 0
    TI__Guru**** 168211 points

    Hi,

    dmesg is not a log file, it is a Linux command, which dumps kernel logs from a buffer in kernel.

  • 0 in reply to Bin Liu
    Guru 12650 points

    Hello,

    I believe that "dmesg" command read information from "/var/log/dmesg" file in general.
    So, I'm asking which directory "dmesg" command referring to read above file.
    Or, is my understanding incorrect ?

    BR,

  • 0 in reply to Ryuuichi machida
    TI__Guru**** 168211 points
    Ryuuichi machida said:

    I believe that "dmesg" command read information from "/var/log/dmesg" file in general.

    Have you seen this file "/var/log/dmesg" on your AM62A board?

    I have SK-AM64B board running with SDK9.1. There is no dmesg file under /var/log/ directory.

  • 0 in reply to Bin Liu
    Guru 12650 points

    Hello,

    >Have you seen this file "/var/log/dmesg" on your AM62A board?
    No, my understanding is from general linux information not for AM6x.
    Since I confirm this difference, I ask this question.
    (What dmesg do not exist under /var/log is specification of TI distributor (Arago project) or you have another reason that this difference cause...)  

    BR,

  • 0 in reply to Ryuuichi machida
    TI__Guru**** 168211 points
    Ryuuichi machida said:
    What dmesg do not exist under /var/log is specification of TI distributor (Arago project)

    No, it is not TI distribution or Arago specific.

    Please see the kernel documentation linked below about kernel printk() and dmesg command.

    https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/core-api/printk-basics.rst?h=v6.8-rc3

    Just quote the document from the beginning of the it:

    All printk() messages are printed to the kernel log buffer, which is a ring
buffer exported to userspace through /dev/kmsg. The usual way to read it is
using ``dmesg``.

    dmesg itself has nothing to do with /var/log/dmesg file. Some Linux distributions have a service which generates and maintains the content of this log files. But dmesg command directly reads the log messages from kernel.

  • 0 in reply to Bin Liu
    Guru 12650 points

    Hello,
    Thank you for your reply.

    >dmesg itself has nothing to do with /var/log/dmesg file. Some Linux distributions have a service which generates and >maintains the content of this log files. But dmesg command directly reads the log messages from kernel.
    Yes, understood.
    What I would like you to confirm is whether TI linux distributor support following feature or not. 
    "Some Linux distributions have a service which generates and maintains the content of this log files."

    Could you comment it ?

    BR,

  • 0 in reply to Ryuuichi machida
    TI__Guru**** 168211 points

    Most modern Linux including TI Processor SDK and Arago use systemd. systemd has a service called journald for managing system logs.

    systemd is a purely open source project, how to use/customize systemd is out of the support scope on this forums. You would need to study the systemd project and figure out how to configure journald to generate system log files to /var/log/ directory.