nrf54l15 - no partition for fcb when using sysbuild

RE: nrf54l15 - no partition for fcb when using sysbuild

Amanda Hsieh — Tue, 17 Feb 2026 17:07:42 GMT

[quote user="MichaelGK"] if i just want any kind of data partition i need to activate the nvs option?[/quote]

No.

[quote user="MichaelGK"]Is there no more better way to do that?[/quote]

You can use a static partition file (pm_static.yml) to create a custom partition and set the size.

fcb_storage:
  address: 0x15f000
  end_address: 0x165000
  region: flash_primary
  size: 0x6000

MichaelGK — Tue, 17 Feb 2026 06:40:19 GMT

Hi,

the special reason is that we want to keep the overhead as small as possible because our log entries them self have only 10 to 20 bytes.

we even think of writing our own management to even get rid of the overhead of the fcb.

So i understand it correctly, if i just want any kind of data partition i need to activate the nvs option? Is there no more better way to do that?

and how can i define the size of this partition?

best regards

Michael

Amanda Hsieh — Mon, 16 Feb 2026 20:09:15 GMT

Hi,

Any special reason to use FBC instead of ZMS?

For nRF54L Series devices, it is recommended to use ZMS. See the Data storage in the nRF Connect SDK.

It will not automatically generate the partition for CONFIG_FCB as CONFIG_NVS. See the code https://github.com/nrfconnect/sdk-nrf/blob/v3.2.2/include/flash_map_pm.h#L32-L45

If needed, you can refer to the nvs_storage partition generated for NVS to create the static partition for the custom partition.

Regards,
Amanda H.