defining static partitions with external flash when boards have different flash sizes

[Anthony Ambuehl]

NCS 2.7

NRF52840

I have 2 different applications: app and mfg_app

I have 2 different boards: small_flash and big_flash

I need to build all 2*2 combinations.

I need to be able to upgrade from mfg_app to app and from app v1->v2.

There boards have different size external flash components, the sizes are indicated in the dts for each board.  I also implemented size references from dts fixed-partition but partition manager doesn't recognize it.

I used partition manager to build partition.yml.  It doesn't have the external_flash information.  Furthermore, I don't see how a single pm_static.yml will be able to support different sizes for each board. 

Do I need to duplicate the static partition file 4 times?  (that seems very annoying to maintain!)

How do I add the external flash paritions?

[Marte Myrvold]

Hi,

You will need to have 4 static partition files. If you include the name of the board in the static partition file like pm_static_<board_name>.yml, for example, pm_static_nrf52840dk_nrf52840.yml, then the correct partition file should automatically be included when you build for that board.

Best regards,
Marte

[Anthony Ambuehl]

Thats pretty poor design, this information should come from dts files so that all apps can work from a consistent information source.

I really hope Nordic/Zephyr considers redesigning partition management with sysbuild to work off the dts defined memory regions and partitions.

[Marte Myrvold]

Hi,

Thank you for the feedback. I have forwarded it internally.

Best regards,
Marte