Use ramoops for logging under Linux (2021)

a year ago

Ramoops is used for logging kernel oopses, console output, and user messages in a reserved RAM area, surviving reboots but not power cycles.
To enable ramoops, a free memory region must be identified and reserved in the device tree, with specific sizes for different log types.
The Toradex Apalis iMX8QM was used as an example, with steps provided to modify the device tree and verify kernel configuration for pstore and ramoops.
After enabling ramoops and rebooting, logs can be accessed by mounting pstore, revealing console output and kernel panic details.
User messages can be stored in ramoops to survive reboots, useful for passing information between boot cycles, though lost during power cycles.
Ramoops is particularly useful for diagnosing kernel panics, differentiating between reboots, power cycles, and crashes for remote device troubleshooting.

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