Storing Device Serial/Identifier

[phipi]

We'd like to be able to store a few items including mutable keys, and unique identifier in each device that is generated on initial boot of the product. I'm just starting out with research but I'm wondering if there is any documentation/guidance from Nordic regarding how/where to store this kind of information?

[phipi]

PM_MCUBOOT_STORAGE_ADDRESS and PM_MCUBOOT_STORAGE_ID seem to be no longer defined as of SDK1.2. Is there a new symbol that should be used now?

[anicare-tero]

For me, DT_FLASH_AREA_STORAGE_OFFSET seems to be working fine.

[phipi]

Okay hopefully one of the Nordic guys can chime in if this is the way to use this now, but thanks for the info. I'll give that a shot in the meantime :)

[phipi]

anicare-tero, do you have a reliable to program these values from command line?

[anicare-tero]

Sorry, I don't understand what you are asking.

[phipi]

I mean I'm able to read/write NVS from the firmware. However, if I want to program a serial number into 100 boards and have the firmware just read that I'm not sure how to write that value to NVS from the host PC while programming the firmware.

[anicare-tero]

First I tried things with Zephyr's NVS sample and then imported the code to my project (that is based on Asset Tracker application). Then I wrote hard coded stuff (like serial) to NVS and moved on when they started to work.

I have implemented Serial LTE Modem sample to my project, before the sample was changed from UART interrupt driven to serial sync mode, and without tcpip and any other parts, only the AT host part from that sample. Then I edited it to first comparing the buffer to my custom commands and then to AT commands.

I have successfully managed to write things like serial to NVS from terminal.

I hope you'll get this working and will happily help you more if you need.

EDIT: lol, actually I didn't answer your question. I'm not sure how to write to NVS when programming (do you mean like flashing the device?) or if it's even possible.

[phipi]

Thanks for all the info, I'll see if I can figure that out :)

[phipi]

lol yes that's what I meant. I thought at first maybe it was buried somewhere in the response. No worries :)

[anicare-tero]

Hi phipi,

Have you found a way to write to NVS when programming? I heard it could be done via SWD but not sure how.

[phipi]

The way I've been doing it until now is generating a hex file with the system config data structure located in the PM_MCUBOOT_STORAGE_ADDRESS part of the flash. Then when we load the application we use the --sector-erase option to prevent it from being overwritten.

However, with the changes to the PM this has broken. From what I understand we will need to define static partitions but I haven't had time to explore that yet.

Here's the thread on that: https://devzone.nordicsemi.com/f/nordic-q-a/58945/sdk1-2-nvs-changes.

Good luck