Understanding Reboot Events Storage

Memfault stores Reboot Event data in a specific way to help diagnose device issues. Understanding this process can help you determine if additional storage solutions are needed for your specific use case.

The Reboot Event Lifecycle

1. When a device reboots, the Reboot Event is initially stored in noinit RAM.
2. During boot, this information is read, then serialized into the Event Storage buffer.
3. The noinit data is then reset to prepare for any future reboots.

Note:

If your device experiences multiple reboots in succession, you should understand the following limitations:

• When a subsequent reboot occurs before data transmission, the previously serialized Reboot Event may be lost.
• The Event Storage buffer resides in .bss memory, which is not persistent across reboots.
• Currently, Memfault does not automatically save/restore this buffer data to persistent storage

Check out our documentation for more information.