west - how to pass child_image configuration via cli

[boaks]

Using west allows to provide some configuration values via the cli:

west build .... -- -DCONFIG_MAIN_STACK_SIZE=4096

Is it possible to pass such configuration values also to child images, e.g. CONFIG_MCUBOOT_SERIAL=n for mcuboot?

[boaks]

It's really a pain:

(I'm using NCS 2.6.1 for a nRF9160 device)

If I uses a "static partition manager file", I need to disable "CONFIG_FPROTECT" in the child.
If I disable "CONFIG_FPROTECT" in the child but without the "static partition manager file" it fails.
And the main "CMakefile" is not aware of "CONFIG_FPROTECT" in the child.