NVS is erased after OTA

RE: NVS is erased after OTA

MOHAMED AHMED ALI MAHMOUD ELSABAGH — Wed, 30 Apr 2025 19:08:22 GMT

I found the issue was in my nvs_driver, the sector size, count and offset were not set correctly to match values in pm_static.yml, once those values were set correctly issue was resolved

RE: NVS is erased after OTA

Vidar Berg — Tue, 29 Apr 2025 11:13:00 GMT

Hi,

The storage partition can become erased if you have both CONFIG_MCUMGR_GRP_ZBASIC_STORAGE_ERASE and CONFIG_MCUMGR_GRP_ZBASIC enabled and if the mcumgr client issues the settings erase command as part of the DFU process. But I see CONFIG_MCUMGR_GRP_ZBASIC is disabled in the configuration I posted, so I assume that is not the issue here. Can you inspect the storage partition after the DFU to see if the partition was erased or overwritten with FW data?

RE: NVS is erased after OTA

MOHAMED AHMED ALI MAHMOUD ELSABAGH — Tue, 29 Apr 2025 10:29:13 GMT

&flash0 {
	partitions {
		compatible = "fixed-partitions";
		#address-cells = <1>;
		#size-cells = <1>;

		boot_partition: partition@0 {
			label = "mcuboot";
			reg = <0x000000000 0x0000C000>;
		};
		boot_pad_partition: partition@c000 {
			label = "mcuboot_pad";
			reg = <0x0000C000 0x0000200>;
		};
		slot0_partition: partition@c200 {
			label = "image-0";
			reg = <0x0000C200 0x00078E00>;
		};
		slot1_partition: partition@85000 {
			label = "image-1";
			reg = <0x00085000 0x00079000>;
		};

		storage_partition: partition@fe000 {
			label = "storage";
			reg = <0x000FE000 0x00002000>;
		};
	};
};

I updated the DTS overlay file, but still have the same issue

RE: NVS is erased after OTA

Turbo J — Mon, 28 Apr 2025 11:22:48 GMT

Your pm_static and DTS overlay disagree on the storage patition layout. pm_static says its at 0xFE000 and 0x2000 bytes while the overlay has it at 0xF8000 with 0x8000 bytes.

They need to match, otherwise the bootloader will overwrite your settings.