(OK) using persistant storage in linux kernel - /sys/fs/pstore/console-ramoops

http://stackoverflow.com/questions/28538091/using-persistant-storage-in-linux-kernel

I am trying to use persistent store(Pstore) available in linux kernel but somehow i am not getting the logs in case of kernel panics,i made the following kernel modules in kernel config file as built in

**CONFIG_PSTORE=y


CONFIG_PSTORE_CONSOLE=y


CONFIG_PSTORE_RAM=y**

now a/c to documentation pstore i should get the logs on next reboot in /sys/fs/pstore/... (or /dev/pstore/...) but couldn't find the logs present there.am i missing something...?

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Answer

check if below config options are enabled

CONFIG_PSTORE=y
CONFIG_PSTORE_CONSOLE=y
**CONFIG_PSTORE_FTRACE=y**
CONFIG_PSTORE_RAM=y

But why /dev/pstore file?, it's not needed,

To check if console-ramoops working, do echo Trigger a kernel panic using command

echo c > /proc/sysrq-trigger

then reboot device manually. after system boots up, run command "/sys/fs/pstore/console-ramoops", check if console_ramoops has got anything logged.