Allow per module prj.conf

[hadrienk]

Is your enhancement proposal related to a problem? Please describe.

I am using mcuboot. I need to manually update the .config under build/mcuboot/zephyr/.config when the build directory is cleaned.

Describe the solution you'd like

Use a special configuration file name convention: prj_mcuboot.conf

This should be compatible with the board configuration prj_mcuboot_YOURBOARD.conf

[carlescufi]

@hadrienk thanks for the feedback. spm is not part of Zephyr, but rather only present in Nordic's Zephyr-based SDK. Could you edit your proposal so that it doesn't mention spm and instead focuses on mcuboot?

[hadrienk]

@carlescufi sure thing.

[carlescufi]

@ulfalizer could you comment on this?

[SebastianBoe]

In NCS one can specify the mcuboot prj.conf like this:

https://github.com/NordicPlayground/fw-nrfconnect-nrf/blob/master/applications/nrf_desktop/CMakeLists.txt#L34

In Zephyr upstream it doesn't make sense to put a child image's build dir inside of the parent image's build dir so this problem does not exist.

Please re-open if more clarification is needed.

[hadrienk]

Thanks. Got it to work. If anyone want to do the same, remember to set the image_CONF_FILE before the include($ENV{ZEPHYR_BASE}/cmake/app/boilerplate.cmake)

set(mcuboot_CONF_FILE "${CMAKE_CURRENT_SOURCE_DIR}/mcuboot.conf")
include($ENV{ZEPHYR_BASE}/cmake/app/boilerplate.cmake)