How to Reserve specific area in flash (2 sectors) and map variables to this section?

[ahmedwahdan]

I'm using multi-image and want to reserve a space (2 sectors) in Application and map some constant data to these section? I believe I don't have to edit partition manager layout as I need this area  to be part of the application. I believe I need to edit the linker script but I don't know how to do so.

Board: NRF52840DK

SDK: NRF Connect 2.1.0

Thanks in advance! 

[Sigurd Hellesvik]

Hi,

I will look into this and return with more information tomorrow.

Regards,
Sigurd Hellesvik

[Sigurd Hellesvik]

It is possible to use the linker for this.

But before i tell you how, I want to make sure it is not an XY problem:
Why do you want to store this data?

Regards,
Sigurd Hellesvik

[ahmedwahdan]

Thanks for thr reply. 

I would like to have some constant to be allocated at specific address so it can be updated over the air, or device specific data that will be flashed during production. 

And using linker for that is the only way I believe, but I stilll can't figure how to do so with the multi-image. 

[Sigurd Hellesvik]

ahmedwahdan said:

device specific data that will be flashed during production. 

Can you use the UICR for device specific data?
https://infocenter.nordicsemi.com/topic/ps_nrf52840/uicr.html?cp=5_0_0_3_4

If you never want to change the data, the UICR is the way to go for this I think.

ahmedwahdan said:

I would like to have some constant to be allocated at specific address so it can be updated over the air

"so it can be updated over the air"

Do you mean:

1. So the "some constant" can be updated over the air, or
2. So your application can be updated (DFU) over the air

?

Regards,
Sigurd Hellesvik

[ahmedwahdan]

Only this data could be updated, app can be the same(it's kind of configurations)