Enabling External Flash with LwM2M sample problem - nRF9160

[mjaszczykowski]

Dear Nordic,

We made an attempt to use the external flash in the LwM2M sample.

We tried to follow this:
docs.nordicsemi.com/.../nrf9160_external_flash.html

As soon as we add:

'

/ {
	chosen {
		nordic,pm-ext-flash = &mx25r64;
	};
};

The sample stops working, it does not even start.

We guess, it is related with MCUBoot issue or not having pm_static.yml file.

Could you please tell us how the proper configuration shall look in this case?

Regards,
Marcin

[Håkon Alseth]

Hi Marcin,

 

Which SDK version are you using?

lwm2m client has a dependency on the full modem fota library, which will require handling of the partitions.

 

Here's a sample, where I have added ext flash (ie. mcuboot secondary in ext-flash):

ncs_v2.7.0_lwm2m_client_ext_flash.zip

 

Could you try this and see if this also works on your end?

 

Kind regards,

Håkon

[mjaszczykowski]

HI Hakon,

Thank you very much for your help.

Your example works perfectly fine.

I am using SDK version 2.5.3.
Can you create a similar sample for 2.5.3 or shall I migrate my code to 2.7?

[Håkon Alseth]

Hi Marcin,

 

For v2.5.3, sysbuild is not used, and child_image/ catalog should be populated in a similar fashion.

Try this:

ncs_v2.5.3_lwm2m_client_ext_flash.zip

 

Let me know if you run into any issues.

I have done limited testing on the sample itself, I just added mcuboot_secondary slot to run from external flash.

 

Kind regards,

Håkon

[mjaszczykowski]

All works!

Håkon Alseth You are a star!