How to prevent data stored in Non-Volatile Storage (NVS) not cleared by west flash command or OTA

RE: How to prevent data stored in Non-Volatile Storage (NVS) not cleared by west flash command or OTA

snowuyl — Thu, 30 Nov 2023 12:41:19 GMT

Thanks for your reply!

RE: How to prevent data stored in Non-Volatile Storage (NVS) not cleared by west flash command or OTA

Sigurd Hellesvik — Thu, 30 Nov 2023 12:22:10 GMT

[quote user="snowuyl"]Is storage_partition erased by west flash command or OTA?[/quote]

It will only be erased by west flash if you run "west flash --erase" or "west flash -recover".

It should not be erased by OTA, as OTA only should overwrite mcuboot_primary and mcuboot_secondary.

RE: How to prevent data stored in Non-Volatile Storage (NVS) not cleared by west flash command or OTA

snowuyl — Wed, 29 Nov 2023 14:46:55 GMT

Thanks for your reply! Since NVS is located at storage_partition. Is storage_partition erased by west flash command or OTA?

#define NVS_PARTITION        storage_partition
#define NVS_PARTITION_DEVICE FIXED_PARTITION_DEVICE(NVS_PARTITION)
#define NVS_PARTITION_OFFSET FIXED_PARTITION_OFFSET(NVS_PARTITION)

int nvsInit(void) {
    int ret = 0;
    struct flash_pages_info info;

    /* define the nvs file system by settings with:
     *    sector_size equal to the pagesize,
     *    3 sectors
     *    starting at NVS_PARTITION_OFFSET
     */
    _gFs.flash_device = NVS_PARTITION_DEVICE;
    if (!device_is_ready(_gFs.flash_device)) {
        LOG_ERR("NVS device %s is not ready\n", _gFs.flash_device->name);
        return ERROR_NVS_INITIALIZE_FAIL;
    }

    _gFs.offset = NVS_PARTITION_OFFSET;
    ret = flash_get_page_info_by_offs(_gFs.flash_device, _gFs.offset, &info);
    if (ret < 0) {
        LOG_ERR("Unable to get page info\n");
        return ERROR_NVS_INITIALIZE_FAIL;
    }
    _gFs.sector_size = info.size;
    _gFs.sector_count = 3U;
    
    ret = nvs_mount(&_gFs);
    if (ret < 0) {
        LOG_ERR("nvs_mount() failed %d\n", ret);
        return ERROR_NVS_INITIALIZE_FAIL;
    }

    _gNvsInitialzed = true;
 
    LOG_INF("NVS has been initialized");

    return 0;
}

RE: How to prevent data stored in Non-Volatile Storage (NVS) not cleared by west flash command or OTA

Sigurd Hellesvik — Wed, 29 Nov 2023 14:43:36 GMT

I see now that you use the nRF5340. If you enable the network core, the partition manager will automatically be enabled. So yes, I recommend this

RE: How to prevent data stored in Non-Volatile Storage (NVS) not cleared by west flash command or OTA

snowuyl — Wed, 29 Nov 2023 14:13:55 GMT

Thanks for your reply! I don’t use partition manager now. Do you suggest to use it?

RE: How to prevent data stored in Non-Volatile Storage (NVS) not cleared by west flash command or OTA

Sigurd Hellesvik — Wed, 29 Nov 2023 13:18:16 GMT

NVS storage location can be configured. The configuration depends on if you use the partition manager or not.

Do you project use the partition manager? (It may be enabled automatically, so check CONFIG_PARTITION_MANAGER_ENABLED.)

RE: How to prevent data stored in Non-Volatile Storage (NVS) not cleared by west flash command or OTA

snowuyl — Wed, 29 Nov 2023 12:18:38 GMT

Thanks for your reply! Does code and NVS locate in different flash sections?

RE: How to prevent data stored in Non-Volatile Storage (NVS) not cleared by west flash command or OTA

Sigurd Hellesvik — Wed, 29 Nov 2023 11:31:11 GMT

[quote user=""] Is it possible to prevent data stored in Non-Volatile Storage (NVS) not cleared by west flash command or OTA?[/quote]

I do not think it should erase the NVS data.

Do you experience this?

Regards,
Sigurd Hellesvik