Mcuboot fails to open flash on nrf52840dk

[waatff]

Hi!
I'm currently developing a project that uses mcuboot. For some evaluation purposes, I'm testing stuff on nrf5480dk and today I came across a strange error.

After flashing my project onto DK, i get such error.
I cannot share my whole project right now, however I managed to reproduce the same exact error by adding nrf52840dk_nrf52840.overlay to sample mesh light:

/ {
	chosen {
		nordic,pm-ext-flash = &mx25r64;
	};
};

I'm using sdk connect v2.6.0.

Steps to reproduce:
1. Create nrf52840dk_nrf52840.overlay file in bluetooth/mesh/light sample
2. Build light sample for nrf52840dk with created overlay and dfu-overlay.conf

[Vidar Berg]

Hi,

Adding the following two files to your child image folder should fix this:

0523.mcuboot.overlay6862.mcuboot.conf

These will enable the QSPI flash in the bootloader so it can access the secondary slot from the external flash. 

https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/config_and_build/multi_image.html#permanent-configuration-changes-to-child-images 

Best regards,

Vidar

[waatff]

The overlay file in fact did help, but is there any way to not automatically include this overlay file in non-dk builds?

[Vidar Berg]

Yes, you can add board specific overlays or Kconfig files in your child image folder as explained in the linked documentation.

e.g.

5824.child_image.zip