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Nordic Case Info
  • Case ID: 338870
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Warning FLASH_SIMULATOR unassigned starting from NCS SDK 2.7.0 due to missing default flash_sim.overlay from build

Alfredo Antolinez

I have found that in NCS SDK 2.6.2 it was very simple to enable FLASH_SIMULATOR as part of the mcuboot configuration overlays. But starting from SDK 2.7.0, I keep getting the following warnings:

warning: FLASH_SIMULATOR (defined at drivers/flash/Kconfig.simulator:6) was assigned the value 'y'
but got the value 'n'. Check these unsatisfied dependencies: DT_HAS_ZEPHYR_SIM_FLASH_ENABLED (=n).
See http://docs.zephyrproject.org/latest/kconfig.html#CONFIG_FLASH_SIMULATOR and/or look up
FLASH_SIMULATOR in the menuconfig/guiconfig interface. The Application Development Primer, Setting
Configuration Values, and Kconfig - Tips and Best Practices sections of the manual might be helpful
too.


warning: FLASH_SIMULATOR_DOUBLE_WRITES (defined at drivers/flash/Kconfig.simulator:42) was assigned
the value 'y' but got the value 'n'. Check these unsatisfied dependencies: FLASH_SIMULATOR (=n). See
http://docs.zephyrproject.org/latest/kconfig.html#CONFIG_FLASH_SIMULATOR_DOUBLE_WRITES and/or look
up FLASH_SIMULATOR_DOUBLE_WRITES in the menuconfig/guiconfig interface. The Application Development
Primer, Setting Configuration Values, and Kconfig - Tips and Best Practices sections of the manual
might be helpful too.

By examining some of my application's build artifacts built under SDK 2.6.2, I see that the flash_sim.overlay was being added by default to the build in the following in build/CMakeCache.txt:

//Default mcuboot configuration file
mcuboot_DTC_OVERLAY_FILE:STRING=/opt/nordic/ncs/v2.6.2/nrf/modules/mcuboot/flash_sim.overlay;/opt/nordic/ncs/v2.6.2/nrf/modules/mcuboot/usb.overlay;/Users/alfredoantolinez/dev/sensor_wearable/wearable/child_image/mcuboot/boards/nrf5340dk_nrf5340_cpuapp.overlay

When looking at the same file under a build with 2.7.0 and up, I only see:

//devicetree overlay file defined by main application
mcuboot_DTC_OVERLAY_FILE:INTERNAL=/{MYPROJPATH}/sysbuild/mcuboot.overlay

I imagine this is a product of switching to sysbuild and possibly providing flexibility to the user to use or not whatever they want for their builds. But I do liked the option to use the overlay provided by Nordic for this functionality.

What is the proper way to enable FLASH_SIMULATOR and including the flash_sim.overlay from Nordic starting from 2.7.0 as it is not clear to me?

I tried to add the following line in the project's CMakeLists.txt file right under the 

cmake_minimum_required
:

set(mcuboot_DTC_OVERLAY_FILE ${ZEPHYR_BASE}/../nrf/modules/mcuboot/flash_sim.overlay)

But that does not seem to be doing anything to the build.

Any help would be appreciated.

Thank you,

Alfredo

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