Nrf91 Documentation update for using devicetree partitions. by lucasvdp · Pull Request #28318 · nrfconnect/sdk-nrf

lucasvdp · 2026-04-22T09:40:20Z

Update documentation for using devicetree partitions instead of partition manager for:

Modem Library
LwM2M Carrier library

NordicBuilder · 2026-04-22T09:51:42Z

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Build number: 5

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sdk-nrf: PR head: cde8772666b901a6b5bbd150970b096fadf10766

more details

sdk-nrf:

PR head: cde8772666b901a6b5bbd150970b096fadf10766
merge base: e93e433b745883c51bc230be39e3be18c360c3a7
target head (main): dd3c1d9b4b8b15b6a75f035cc69755315933c5ef
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List of changed files detected by CI (3)

doc
│  ├── nrf
│  │  ├── libraries
│  │  │  ├── bin
│  │  │  │  ├── lwm2m_carrier
│  │  │  │  │  │ requirements.rst
│  │  │  ├── modem
│  │  │  │  ├── nrf_modem_lib
│  │  │  │  │  ├── index.rst
│  │  │  │  │  │ nrf_modem_lib_dt_integration.rst

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Note: This message is automatically posted and updated by the CI

github-actions · 2026-04-22T10:13:44Z

You can find the documentation preview for this PR here.

Preview links for modified nRF Connect SDK documents:

https://ncsbmdoc.z6.web.core.windows.net/ncs/PR-28318/nrf/libraries/bin/lwm2m_carrier/requirements.html
https://ncsbmdoc.z6.web.core.windows.net/ncs/PR-28318/nrf/libraries/modem/nrf_modem_lib/index.html
https://ncsbmdoc.z6.web.core.windows.net/ncs/PR-28318/nrf/libraries/modem/nrf_modem_lib/nrf_modem_lib_dt_integration.html

nordic-mare · 2026-04-24T10:02:03Z

+* nrf91 LTE: 1256 bytes
+* nrf91 DECT: 1832 bytes
+* nrf92 LTE: 4096 bytes


You could maybe use the modem firmware product names here, that is, mfw_91x1, mfw-nr+_nrf91x1 and so on

I'm not sure if the name for nRF92 MFW has been agreed yet, I will check.

Should we list NTN as well then? What will be the firmware name for the nRF9251? What about the nRF9280?
Would be nice but a bit of extra effort to maintain a complete table here.

If we change this, for nRF91 the list should be mfw_nrf9160, mfw_nrf91x1 and mfw_nrf9151-ntn.

The official name for nRF92 firmware is ciot_nrf92 (yes, no mfw in the name on purpose).

I made it into a table.

Document devicetree partition requirement for the LwM2M Carrier library. Signed-off-by: Lucas van der Ploeg <lucas.vanderploeg@nordicsemi.no>

lucasvdp · 2026-04-24T11:34:38Z

+
+The regions shared with modem need to be placed in a specific area depending on the device:
+
+* nRF91 Series devices: Within the first 128 kB of RAM.


Many samples decrease or increase the shared memory with modem to either increase the RAM for the App or allow for larger packets. Other samples add the trace partition to the shared memory.

I think this would be a good place to document the limitations of the shared memory. Our internal documentation is a bit cryptic. @mparpala can you confirm this is correct and complete? Do we want to add the actual addresses? Then we need to split it into nRF9251 and nRF9280.

Add devicetree integration documentation for the modem library. Signed-off-by: Lucas van der Ploeg <lucas.vanderploeg@nordicsemi.no>

tokangas · 2026-04-24T12:46:21Z

+* nRF91 Series devices: Within the first 128 kB of RAM.
+* nRF92 Series devices: Within the last 64 kB of Global Domain RAM0.
+
+The control region has a minimum size depending on the modem version:


Suggested change

The control region has a minimum size depending on the modem version:

The control region has a minimum size depending on the modem firmware:

tokangas · 2026-04-24T12:47:12Z

+
+The control region has a minimum size depending on the modem version:
+
+.. list-table:: Firmware Sizes


I don't think a caption is mandatory. If it's present, it should be something else.

Suggested change

.. list-table:: Firmware Sizes

.. list-table:: Control region sizes

tokangas · 2026-04-24T12:47:25Z

+   :header-rows: 1
+
+   * - Firmware
+     - control region size


Suggested change

- control region size

- Control region size

lucasvdp requested review from a team as code owners April 22, 2026 09:40

NordicBuilder added the doc-required PR must not be merged without tech writer approval. label Apr 22, 2026

lucasvdp mentioned this pull request Apr 22, 2026

nRF91 support without Partition Manager #27973

Merged

NordicBuilder requested a review from a team April 22, 2026 09:40

lucasvdp requested a review from divipillai April 22, 2026 09:50

lucasvdp added the no-changelog label Apr 22, 2026

tokangas reviewed Apr 22, 2026

View reviewed changes

lucasvdp force-pushed the nrf91_without_pm_doc_update branch from 0319064 to f42a278 Compare April 24, 2026 09:51

nordic-mare reviewed Apr 24, 2026

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doc: libraries: bin: lwm2m_carrier: Add devicetree note

e15eec6

Document devicetree partition requirement for the LwM2M Carrier library. Signed-off-by: Lucas van der Ploeg <lucas.vanderploeg@nordicsemi.no>

lucasvdp force-pushed the nrf91_without_pm_doc_update branch from f42a278 to 41719fe Compare April 24, 2026 11:18

nordic-mare reviewed Apr 24, 2026

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Comment thread doc/nrf/libraries/modem/nrf_modem_lib/nrf_modem_lib_dt_integration.rst Outdated

lucasvdp force-pushed the nrf91_without_pm_doc_update branch from 41719fe to a4277bf Compare April 24, 2026 11:32

lucasvdp commented Apr 24, 2026

View reviewed changes

doc: libraries: modem: nrf_modem_lib: Add devicetree guide

cde8772

Add devicetree integration documentation for the modem library. Signed-off-by: Lucas van der Ploeg <lucas.vanderploeg@nordicsemi.no>

lucasvdp force-pushed the nrf91_without_pm_doc_update branch from a4277bf to cde8772 Compare April 24, 2026 11:53

tokangas reviewed Apr 24, 2026

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		The regions shared with modem need to be placed in a specific area depending on the device:

		* nRF91 Series devices: Within the first 128 kB of RAM.

	The control region has a minimum size depending on the modem version:
	The control region has a minimum size depending on the modem firmware:


		The control region has a minimum size depending on the modem version:

		.. list-table:: Firmware Sizes

	.. list-table:: Firmware Sizes
	.. list-table:: Control region sizes

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lucasvdp commented Apr 22, 2026

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NordicBuilder commented Apr 22, 2026 •

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