settings storage in external flash

[Bilal]

Hi,

Is it possible to use the Zephyr settings storage subsystem to store data in external flash?

We are dealing with some internal flash space issues and are trying to see if we can offload the "settings_storage" partition we currently have in internal flash to be stored in the external flash (using the MX25R32 flash device)

I tried updating our pm_static.yml file to define the parition like so:

settings_storage: { address: 0xf8000, device: MX25R32, region: external_flash }

But that throws errors when trying to save something to the settings subsystem.

Am I missing something? Is there something else I should be doing in order to be able to do this?

Is this even possible?

Any help would be appreciated, Thanks

[Simonr]

Hi Bilal

Sorry, a misunderstanding on my part and it seems I jumped the gun on that last reply. 

If you for example NVS as the settings backend, and you want to use the partition manager, you can set the partition manager to external flash, and set the CONFIG_PM_PARTITION_REGION_NVS_STORAGE_EXTERNAL to get a partition to the external flash.

My colleague released a blog post on how to use the subsystems to for example store keys, etc. just last week, so you can give that a read as well to get a better overview of what your options are.

Best regards,

Simon