Zephyr application build system is not aware of settings partition

[MarekPieta]

Describe the bug
Application build system is not aware of settings partition. For big applications that may result in building improper hex. In case code does not fit on the "code partition", part of the firmware may actually reside in the settings FLASH area.

Expected behavior
Developer should not be able to successfully build application that does not fit into memory (or at least there should be warning related to the problem).

Impact
Settings may remove/damage part of the firmware. That leads to errors that could be really difficult to debug.

RFC Proposal for nRF boards: #29794

[nvlsianpu]

@tejlmand Can you help with this issue?

[tejlmand]

@nvlsianpu sure. will take a look.

[pdunaj]

Hi @MaureenHelm , I highly recommend to review the bug priority. The problem is that user may be completely unaware that part of his code is gone. It may be part of the code that is responsible for some critical action executed rarely.

[pabigot]

Agreed, if the flash area used for code/data does not limit the memory region used by the linker to store code/data that's not a low priority bug. @nashif

[ioannisg]

Agreed. Changing this to medium, for now.