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AM335x Saving log file when system crashes

Wayne Kuo
Intellectual 870 points

Hello all,

I facing a issue that customer's product sometime crash on specific end customer's environment.
Customer use AM335x + Linux SDK 6.0.

Right now, customer can not use console to capture system / app log.
Is there any way to save log while system crash?

I did some research, the Kernel log is save in /var/log/ , but it can not save logs before reboot.
I also tried "tee" command to save task log to a file, but it not helpful while system crash.

I saw a function "PSTORE" could help for this issue, and it is inncluded in SDK 6.0.
However, I can not use this function even I turn it on in menuconnfig.
Is anything I missing?
How can I enable PSTORE function and use it?
Is there other way to save crash log while system panic?

Anything is helpful. Thank you.

Best Regards,
Wayne Kuo

  • 0
    TI__Guru**** 393215 points
    Hi,

    The software team have been notified. They will respond here.
  • 0
    TI__Guru**** 161600 points
    Hi Wayne,

    Can you try adding:

    CONFIG_PSTORE=y
    CONFIG_PSTORE_CONSOLE=y //logs kernel consol messages
    CONFIG_PSTORE_PMSG=y //logs user space messages

    in tisdk_am335x-evm_defconfig and rebuilding the kernel?

    Best Regards,
    Yordan
  • 0 in reply to Yordan Kovachev
    Intellectual 870 points

    Hi Yordan,

    Thanks for your reply.

    I've try your suggestion, but no luck.
    It seems SDK 6.0 does not have PSTORE_CONSOLE and PSTORE_PMSG function, so even I turn these two config on it doesn't help.
    I compared SDK 7.0 and SDK 6.0, the source code of PSTORE is different as below.
    Any suggestion?

    BTW, I tried to enable PSTORE on SDK 7.0, the system has created a directory "/sys/fs/pstore/" but there is no anything else.
    dmesg does not show any log of PSTORE or RAMOOPS.
    I simulate a crash situation after I turn PSTORE on, but there is no any crash log while I reboot the system.
    I think I missing something, any suggestion?

    PSTORE source code:
    SDK 6.0:
    -rw-r--r-- 1 wpi wpi 7737 Jun 26 2013 inode.c
    -rw-r--r-- 1 wpi wpi 272 Jun 26 2013 internal.h
    -rw-r--r-- 1 wpi wpi 541 Jun 26 2013 Kconfig
    -rw-r--r-- 1 wpi wpi 102 Jun 26 2013 Makefile
    -rw-r--r-- 1 wpi wpi 6728 Jun 26 2013 platform.c

    SDK 7.0:
    -rw-r--r-- 1 wpi wpi 3086 Dec 15 2014 ftrace.c
    -rw-r--r-- 1 wpi wpi 10293 Dec 15 2014 inode.c
    -rw-r--r-- 1 wpi wpi 1265 Dec 15 2014 internal.h
    -rw-r--r-- 1 wpi wpi 1643 Dec 15 2014 Kconfig
    -rw-r--r-- 1 wpi wpi 214 Dec 15 2014 Makefile
    -rw-r--r-- 1 wpi wpi 12863 Dec 15 2014 platform.c
    -rw-r--r-- 1 wpi wpi 15515 Dec 15 2014 ram.c
    -rw-r--r-- 1 wpi wpi 13244 Dec 15 2014 ram_core.c

    Best Regards,
    Wayne Kuo