storage

Zephyr RTOS uses Non-Volatile Storage (NVS) to retain settings and data across reboots. You enable it in your build configuration, define a fixed flash partition in Devicetree, and use nvs_read and nvs_write with a centralized ID map to store data safely.

Devicetree fixed partitions define the flash memory layout for NVS in Zephyr. You assign a dedicated storage_partition in the Devicetree, enabling the system to safely locate and manage the flash region used for persistent data at runtime.

Zephyr's NVS implementation includes built-in wear leveling, so you do not need a separate mechanism. By enabling NVS via your build configuration, wear leveling is automatically handled to protect your flash memory during frequent write operations.

nvs_write operations in Zephyr often fail due to incorrect flash layout or missing build configurations. Ensure CONFIG_NVS, CONFIG_FLASH, and CONFIG_FLASH_PAGE_LAYOUT are enabled, and verify your Devicetree storage_partition aligns with the actual hardware flash boundaries.

Yes, you can query and adapt to flash layout at runtime in Zephyr. This partition-aware management allows your application to verify storage boundaries dynamically, ensuring safe NVS access and preventing accidental writes outside the designated fixed partition.