How to verify SDK data and application in NCS CONNECT SDK v1.9.1?

RE: How to verify SDK data and application in NCS CONNECT SDK v1.9.1?

Amanda Hsieh — Tue, 17 Jan 2023 21:02:37 GMT

Hi,

Please contact your regional sales manager for the feature request. If you don't know who your RSM is or don't have their contact info you can get in touch with the RSM of your area by filling out the sales-related questions form here.

-Amanda H.

RE: How to verify SDK data and application in NCS CONNECT SDK v1.9.1?

hiteshk014 — Mon, 16 Jan 2023 12:35:30 GMT

Hi Amanda,

We have mentioned queries,

1. As you mentioned in one of comments, SDK will have CRC verification for a block data as an improvement, is there any plan of getting this CRC verification anytime soon,

2. As there is no API to verify CRC for internal flash sector, where the device name, RPL entries, app key, network key & device key are getting stored post provisioning, how do we identify the failure in this sector of memory block if it is corrupted, as we can observe these all mentioned information is getting stored, is there any mechanism to identify failure in this memory chunk prior to enable BLE

3. Is there any api provided by SDK which we can call to check the failure in internal flash so that we can enable the corrective actions in our system.

Thank you,

Regards,

Hitesh

RE: How to verify SDK data and application in NCS CONNECT SDK v1.9.1?

Amanda Hsieh — Tue, 06 Dec 2022 15:41:12 GMT

Hi,

[quote user="Akanksha"]Does all the previous ates stored in nvs storage area are verified while initializing the nvs? If yes, could you direct me to the api/ part of code where this requirement is achieved?[/quote]

All ates get verified. Any ate which is invalid is skipped.

[quote user="Akanksha"]What is the use of nvs_gc api ?[/quote]

It is the garbage collection routine - it removes waste records and makes some room for new records

-Amanda H.

RE: How to verify SDK data and application in NCS CONNECT SDK v1.9.1?

Amanda Hsieh — Tue, 06 Dec 2022 15:38:20 GMT

Hi,

[quote user="vim_nordic"]I am not wanted to added data payload CRC, but if we want to verify the SDK data manually before initializing the Bluetooth and after flash initialization. How can we verify NVS? [/quote]

As I mention NVS doesn't implement CRC for data blocks - this need to be done as an improvement to NVS or be implemented in the NVS's data user module (settings backend).

[quote user="vim_nordic"]Requesting you to provide the API list which we can use to verify the NVS before initilization.[/quote]

NVS checks its metadata internally - no API for that.

-Amanda H.

RE: How to verify SDK data and application in NCS CONNECT SDK v1.9.1?

Akanksha — Mon, 05 Dec 2022 06:54:35 GMT

Hi,

1. Does all the previous ates stored in nvs storage area are verified while initializing the nvs? If yes, could you direct me to the api/ part of code where this requirement is achieved?

2. What is the use of nvs_gc api ?

RE: How to verify SDK data and application in NCS CONNECT SDK v1.9.1?

Akanksha — Thu, 01 Dec 2022 13:12:07 GMT

Hi AmandaH,

As you told the NVS data is verified during initialization, could you please walk me to the api's or logic where the nvs is validated while initializing.

RE: How to verify SDK data and application in NCS CONNECT SDK v1.9.1?

vim_nordic — Thu, 01 Dec 2022 06:55:22 GMT

Thanks, Amanda, for your response.

1. I am not wanted to added data payload CRC, but if we want to verify the SDK data manually before initializing the Bluetooth and after flash initialization. How can we verify NVS?

2. Requesting you to provide the API list which we can use to verify the NVS before initilization.

RE: How to verify SDK data and application in NCS CONNECT SDK v1.9.1?

Amanda Hsieh — Tue, 16 Aug 2022 12:31:00 GMT

Hi,

Sorry for the delay.

1. Yes, Each metadata (ATE) contains its own CRC against its fields.

2. NVS does not implement CRC for data chunks - it is up to you to add your own data-payload-CRC in the data you write.

-Amanda

RE: How to verify SDK data and application in NCS CONNECT SDK v1.9.1?

hiteshk014 — Mon, 15 Aug 2022 21:29:36 GMT

Hi AmandaH,

Awaiting for your reply

RE: How to verify SDK data and application in NCS CONNECT SDK v1.9.1?

hiteshk014 — Wed, 10 Aug 2022 06:34:42 GMT

Hi AmandaH,

we referred to Non-Volatile Storage (NVS) page you mentioned in previous reply

"Byte related CRC check is mentioned in this point Each element is stored in flash as metadata (8 byte) and data. The metadata is written in a table starting from the end of a nvs sector, the data is written one after the other from the start of the sector. The metadata consists of: id, data offset in sector, data length, part (unused) and a crc"

Now after referring to this we explored and could find nvs_ate_valid in nvs.c file (Path: zephyr\subsys\fs\nvs\nvs.c) which returns 1 if CRC & Offset is valid,

our queries:

1. This CRC check is happening for Each 8 byte metadata right ?

2. We need an API to check CRC of this 24kb Chunk not just Metadata, can you please suggest if we have any mechanism to validate the CRC of this 24kb SDK data memory, Or if can you suggest the memory location from the where we can pick CRC count if the CRC of this chunk is already getting validated in SDK.

Thank you,

Regards,

RE: How to verify SDK data and application in NCS CONNECT SDK v1.9.1?

Amanda Hsieh — Mon, 08 Aug 2022 09:31:13 GMT

Hi,

From Non-Volatile Storage (NVS):

During initialization NVS will verify the data stored in flash, if it encounters an error it will ignore any data with missing/incorrect metadata.

Is this what you are looking for?

From the note in the Settings page:

As of Zephyr release 2.1 the recommended backend for non-filesystem storage is NVS.

-Amanda

RE: How to verify SDK data and application in NCS CONNECT SDK v1.9.1?

vim_nordic — Fri, 05 Aug 2022 10:09:48 GMT

Hi AmandaH,

I am wanted to verify the "storage_partiontion" which is storing the SDK data like provisioning/un-provisioning, sequence number, IV index, RPL messages etc. on device bootup not the image.

Thanks

Vimal

RE: How to verify SDK data and application in NCS CONNECT SDK v1.9.1?

Amanda Hsieh — Fri, 05 Aug 2022 08:27:25 GMT

Hi,

Do you mean the verification running on the chip? If so, we think MCUBOOT can do some integrity checks before starting the application. If the image is not valid, it should not boot

https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/mcuboot/design.html#integrity-check

-Amanda

RE: How to verify SDK data and application in NCS CONNECT SDK v1.9.1?

vim_nordic — Fri, 05 Aug 2022 05:23:28 GMT

Hi AmandaH,

Our Requirement is to validate the whole SDK area. Is SDK partition data is valid or got corrupted before initializing any application module?

Are we handling this validation in SDK already? If yes, where and how?

if No, how we can handle this?

Thanks

Vimal

RE: How to verify SDK data and application in NCS CONNECT SDK v1.9.1?

Amanda Hsieh — Thu, 04 Aug 2022 11:18:57 GMT

Hi,

What application and SDK data would you verify?

May I know more detail about your application?

Regards,
Amanda