Hi,
With NCS v3.1.0 and Nordic's downstream zephyr ncs-v3.1.0, I got build failure with following message:
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warning: attempt to assign the value 'n' to the undefined symbol MCUBOOT_HARDWARE_DOWNGRADE_PREVENTION
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This failure can be reproduced by building sample 'with_mcuboot'.
Command as below:
west build -p always -b nrf52840dk/nrf52840 zephyr/samples/sysbuild/with_mcuboot --sysbuild
But I can succeed to build it without '--sysbuild'. And BTW, with same system (machine with Ubuntu v22.04 installed) I can build this sample with original 'zephyr' according to 'Getting Started Guide'