NCS blinky sample with boot loader build error

I'm trying to test out the boot loader using the blinky sample.  However if I add the following to prj.conf:

CONFIG_SECURE_BOOT=y

CONFIG_BOOTLOADER_MCUBOOT=y

I'm getting the build error shown below:

$ west build

WARNING: This looks like a fresh build and BOARD is unknown; so it probably won't work. To fix, use --board=<your-board>.

Note: to silence the above message, run 'west config build.board_warn false'

-- west build: generating a build system

Including boilerplate (Zephyr base): /Users/denis/sandbox/ncs/zephyr/cmake/app/boilerplate.cmake

-- Application: /Users/denis/sandbox/denisbohm/firefly-go-kart/blinky

-- Zephyr version: 2.4.0 (/Users/denis/sandbox/ncs/zephyr)

-- Found Python3: /usr/local/opt/python@3.8/bin/python3.8 (found suitable exact version "3.8.7") found components: Interpreter 

-- Found west (found suitable version "0.8.0", minimum required is "0.7.1")

-- Board: nrf5340dk_nrf5340_cpuapp

-- Cache files will be written to: /Users/denis/Library/Caches/zephyr

-- Found dtc: /usr/local/bin/dtc (found suitable version "1.6.0", minimum required is "1.4.6")

-- Found toolchain: gnuarmemb (/Users/denis/sandbox/gcc-arm-none-eabi-9-2019-q4-major)

-- Found BOARD.dts: /Users/denis/sandbox/ncs/zephyr/boards/arm/nrf5340dk_nrf5340/nrf5340dk_nrf5340_cpuapp.dts

nrf5340dk_nrf5340_cpuapp.dts.pre.tmp:55.42-67.3: Warning (unique_unit_address_if_enabled): /soc/peripheral@50000000/flash-controller@39000: duplicate unit-address (also used in node /soc/peripheral@50000000/kmu@39000)

nrf5340dk_nrf5340_cpuapp.dts.pre.tmp:329.19-335.3: Warning (unique_unit_address_if_enabled): /soc/peripheral@50000000/clock@5000: duplicate unit-address (also used in node /soc/peripheral@50000000/power@5000)

nrf5340dk_nrf5340_cpuapp.dts.pre.tmp:584.31-585.5: Warning (unique_unit_address_if_enabled): /reserved-memory/image@20000000: duplicate unit-address (also used in node /reserved-memory/image_s@20000000)

  also defined at nrf5340dk_nrf5340_cpuapp.dts.pre.tmp:604.14-606.3

-- Generated zephyr.dts: /Users/denis/sandbox/denisbohm/firefly-go-kart/blinky/build/zephyr/zephyr.dts

-- Generated devicetree_unfixed.h: /Users/denis/sandbox/denisbohm/firefly-go-kart/blinky/build/zephyr/include/generated/devicetree_unfixed.h

Parsing /Users/denis/sandbox/ncs/zephyr/Kconfig

Loaded configuration '/Users/denis/sandbox/ncs/zephyr/boards/arm/nrf5340dk_nrf5340/nrf5340dk_nrf5340_cpuapp_defconfig'

Merged configuration '/Users/denis/sandbox/denisbohm/firefly-go-kart/blinky/prj.conf'

Configuration saved to '/Users/denis/sandbox/denisbohm/firefly-go-kart/blinky/build/zephyr/.config'

Kconfig header saved to '/Users/denis/sandbox/denisbohm/firefly-go-kart/blinky/build/zephyr/include/generated/autoconf.h'

-- The C compiler identification is GNU 9.2.1

-- The CXX compiler identification is GNU 9.2.1

-- The ASM compiler identification is GNU

-- Found assembler: /Users/denis/sandbox/gcc-arm-none-eabi-9-2019-q4-major/bin/arm-none-eabi-gcc

=== child image b0 -  begin ===

Including boilerplate (Zephyr base): /Users/denis/sandbox/ncs/zephyr/cmake/app/boilerplate.cmake

-- Application: /Users/denis/sandbox/ncs/nrf/samples/bootloader

-- Zephyr version: 2.4.0 (/Users/denis/sandbox/ncs/zephyr)

-- Found Python3: /usr/local/opt/python@3.8/bin/python3.8 (found suitable exact version "3.8.7") found components: Interpreter 

-- Found west (found suitable version "0.8.0", minimum required is "0.7.1")

-- Board: nrf5340dk_nrf5340_cpuapp

-- Cache files will be written to: /Users/denis/Library/Caches/zephyr

-- Found dtc: /usr/local/bin/dtc (found suitable version "1.6.0", minimum required is "1.4.6")

-- Found toolchain: gnuarmemb (/Users/denis/sandbox/gcc-arm-none-eabi-9-2019-q4-major)

-- Found BOARD.dts: /Users/denis/sandbox/ncs/zephyr/boards/arm/nrf5340dk_nrf5340/nrf5340dk_nrf5340_cpuapp.dts

nrf5340dk_nrf5340_cpuapp.dts.pre.tmp:55.42-67.3: Warning (unique_unit_address_if_enabled): /soc/peripheral@50000000/flash-controller@39000: duplicate unit-address (also used in node /soc/peripheral@50000000/kmu@39000)

nrf5340dk_nrf5340_cpuapp.dts.pre.tmp:329.19-335.3: Warning (unique_unit_address_if_enabled): /soc/peripheral@50000000/clock@5000: duplicate unit-address (also used in node /soc/peripheral@50000000/power@5000)

nrf5340dk_nrf5340_cpuapp.dts.pre.tmp:584.31-585.5: Warning (unique_unit_address_if_enabled): /reserved-memory/image@20000000: duplicate unit-address (also used in node /reserved-memory/image_s@20000000)

  also defined at nrf5340dk_nrf5340_cpuapp.dts.pre.tmp:604.14-606.3

-- Generated zephyr.dts: /Users/denis/sandbox/denisbohm/firefly-go-kart/blinky/build/b0/zephyr/zephyr.dts

-- Generated devicetree_unfixed.h: /Users/denis/sandbox/denisbohm/firefly-go-kart/blinky/build/b0/zephyr/include/generated/devicetree_unfixed.h

Parsing /Users/denis/sandbox/ncs/zephyr/Kconfig

Loaded configuration '/Users/denis/sandbox/ncs/zephyr/boards/arm/nrf5340dk_nrf5340/nrf5340dk_nrf5340_cpuapp_defconfig'

Merged configuration '/Users/denis/sandbox/ncs/nrf/samples/bootloader/prj.conf'

Configuration saved to '/Users/denis/sandbox/denisbohm/firefly-go-kart/blinky/build/b0/zephyr/.config'

Kconfig header saved to '/Users/denis/sandbox/denisbohm/firefly-go-kart/blinky/build/b0/zephyr/include/generated/autoconf.h'

-- The C compiler identification is GNU 9.2.1

-- The CXX compiler identification is GNU 9.2.1

-- The ASM compiler identification is GNU

-- Found assembler: /Users/denis/sandbox/gcc-arm-none-eabi-9-2019-q4-major/bin/arm-none-eabi-gcc

CMake Warning at ../../subsys/bootloader/CMakeLists.txt:21 (message):

  

        --------------------------------------------------------

        --- WARNING: When using the immutable bootloader on  ---

        --- this SoC, the UICR must be erased when flashing. ---

        --- E.g. by calling 'west flash --erase'             ---

        --------------------------------------------------------

CMake Deprecation Warning at /Users/denis/sandbox/ncs/modules/lib/civetweb/CMakeLists.txt:2 (cmake_minimum_required):

  Compatibility with CMake < 2.8.12 will be removed from a future version of

  CMake.

  Update the VERSION argument <min> value or use a ...<max> suffix to tell

  CMake that the project does not need compatibility with older versions.

CMake Warning at /Users/denis/sandbox/ncs/zephyr/kernel/CMakeLists.txt:54 (message):

  Single threaded mode (CONFIG_MULTITHREADING=n) is deprecated

-- Configuring done

-- Generating done

-- Build files have been written to: /Users/denis/sandbox/denisbohm/firefly-go-kart/blinky/build/b0

=== child image b0 -  end ===

=== child image mcuboot -  begin ===

Including boilerplate (Zephyr base): /Users/denis/sandbox/ncs/zephyr/cmake/app/boilerplate.cmake

-- Application: /Users/denis/sandbox/ncs/bootloader/mcuboot/boot/zephyr

-- Zephyr version: 2.4.0 (/Users/denis/sandbox/ncs/zephyr)

-- Found Python3: /usr/local/opt/python@3.8/bin/python3.8 (found suitable exact version "3.8.7") found components: Interpreter 

-- Found west (found suitable version "0.8.0", minimum required is "0.7.1")

-- Board: nrf5340dk_nrf5340_cpuapp

-- Cache files will be written to: /Users/denis/Library/Caches/zephyr

-- Found dtc: /usr/local/bin/dtc (found suitable version "1.6.0", minimum required is "1.4.6")

-- Found toolchain: gnuarmemb (/Users/denis/sandbox/gcc-arm-none-eabi-9-2019-q4-major)

-- Found BOARD.dts: /Users/denis/sandbox/ncs/zephyr/boards/arm/nrf5340dk_nrf5340/nrf5340dk_nrf5340_cpuapp.dts

-- Found devicetree overlay: /Users/denis/sandbox/ncs/bootloader/mcuboot/boot/zephyr/dts.overlay

nrf5340dk_nrf5340_cpuapp.dts.pre.tmp:55.42-67.3: Warning (unique_unit_address_if_enabled): /soc/peripheral@50000000/flash-controller@39000: duplicate unit-address (also used in node /soc/peripheral@50000000/kmu@39000)

nrf5340dk_nrf5340_cpuapp.dts.pre.tmp:329.19-335.3: Warning (unique_unit_address_if_enabled): /soc/peripheral@50000000/clock@5000: duplicate unit-address (also used in node /soc/peripheral@50000000/power@5000)

nrf5340dk_nrf5340_cpuapp.dts.pre.tmp:584.31-585.5: Warning (unique_unit_address_if_enabled): /reserved-memory/image@20000000: duplicate unit-address (also used in node /reserved-memory/image_s@20000000)

  also defined at nrf5340dk_nrf5340_cpuapp.dts.pre.tmp:604.14-606.3

-- Generated zephyr.dts: /Users/denis/sandbox/denisbohm/firefly-go-kart/blinky/build/mcuboot/zephyr/zephyr.dts

-- Generated devicetree_unfixed.h: /Users/denis/sandbox/denisbohm/firefly-go-kart/blinky/build/mcuboot/zephyr/include/generated/devicetree_unfixed.h

Parsing /Users/denis/sandbox/ncs/bootloader/mcuboot/boot/zephyr/Kconfig

Loaded configuration '/Users/denis/sandbox/ncs/zephyr/boards/arm/nrf5340dk_nrf5340/nrf5340dk_nrf5340_cpuapp_defconfig'

Merged configuration '/Users/denis/sandbox/ncs/bootloader/mcuboot/boot/zephyr/prj.conf'

Merged configuration '/Users/denis/sandbox/ncs/nrf/subsys/bootloader/image/multi_image_mcuboot.conf'

Merged configuration '/Users/denis/sandbox/ncs/nrf/subsys/bootloader/image/fw_info.conf'

Configuration saved to '/Users/denis/sandbox/denisbohm/firefly-go-kart/blinky/build/mcuboot/zephyr/.config'

Kconfig header saved to '/Users/denis/sandbox/denisbohm/firefly-go-kart/blinky/build/mcuboot/zephyr/include/generated/autoconf.h'

-- The C compiler identification is GNU 9.2.1

-- The CXX compiler identification is GNU 9.2.1

-- The ASM compiler identification is GNU

-- Found assembler: /Users/denis/sandbox/gcc-arm-none-eabi-9-2019-q4-major/bin/arm-none-eabi-gcc

CMake Deprecation Warning at /Users/denis/sandbox/ncs/modules/lib/civetweb/CMakeLists.txt:2 (cmake_minimum_required):

  Compatibility with CMake < 2.8.12 will be removed from a future version of

  CMake.

  Update the VERSION argument <min> value or use a ...<max> suffix to tell

  CMake that the project does not need compatibility with older versions.

CMake Warning at /Users/denis/sandbox/ncs/zephyr/kernel/CMakeLists.txt:54 (message):

  Single threaded mode (CONFIG_MULTITHREADING=n) is deprecated

MCUBoot bootloader key file: /Users/denis/sandbox/ncs/bootloader/mcuboot/root-rsa-2048.pem

-- Configuring done

-- Generating done

-- Build files have been written to: /Users/denis/sandbox/denisbohm/firefly-go-kart/blinky/build/mcuboot

=== child image mcuboot -  end ===

CMake Warning at /Users/denis/sandbox/ncs/nrf/cmake/mcuboot.cmake:120 (message):

  

        ---------------------------------------------------------

        --- WARNING: Using default MCUBoot key, it should not ---

        --- be used for production.                           ---

        ---------------------------------------------------------

        

Call Stack (most recent call first):

  /Users/denis/sandbox/ncs/bootloader/mcuboot/zephyr/CMakeLists.txt:1 (include)

CMake Deprecation Warning at /Users/denis/sandbox/ncs/modules/lib/civetweb/CMakeLists.txt:2 (cmake_minimum_required):

  Compatibility with CMake < 2.8.12 will be removed from a future version of

  CMake.

  Update the VERSION argument <min> value or use a ...<max> suffix to tell

  CMake that the project does not need compatibility with older versions.

-- Configuring done

-- Generating done

-- Build files have been written to: /Users/denis/sandbox/denisbohm/firefly-go-kart/blinky/build

-- west build: building application

[0/173] Generating extra provision key files

[1/173] Preparing syscall dependency handling

[15/173] Performing build step for 'b0_subimage'

[1/144] Preparing syscall dependency handling

[139/144] Linking C executable zephyr/zephyr_prebuilt.elf

FAILED: zephyr/zephyr_prebuilt.elf 

: && ccache /Users/denis/sandbox/gcc-arm-none-eabi-9-2019-q4-major/bin/arm-none-eabi-gcc   zephyr/CMakeFiles/zephyr_prebuilt.dir/misc/empty_file.c.obj -o zephyr/zephyr_prebuilt.elf  -Wl,-T  zephyr/linker.cmd  -Wl,-Map=/Users/denis/sandbox/denisbohm/firefly-go-kart/blinky/build/b0/zephyr/zephyr_prebuilt.map  -Wl,--whole-archive  app/libapp.a  zephyr/libzephyr.a  zephyr/arch/common/libarch__common.a  zephyr/arch/arch/arm/core/aarch32/libarch__arm__core__aarch32.a  zephyr/arch/arch/arm/core/aarch32/cortex_m/libarch__arm__core__aarch32__cortex_m.a  zephyr/arch/arch/arm/core/aarch32/cortex_m/cmse/libarch__arm__core__aarch32__cortex_m__cmse.a  zephyr/lib/libc/minimal/liblib__libc__minimal.a  zephyr/lib/posix/liblib__posix.a  zephyr/drivers/serial/libdrivers__serial.a  modules/nrf/lib/fprotect/lib..__nrf__lib__fprotect.a  modules/nrf/lib/fatal_error/lib..__nrf__lib__fatal_error.a  modules/nrf/subsys/bootloader/bl_boot/lib..__nrf__subsys__bootloader__bl_boot.a  modules/nrf/subsys/bootloader/bl_crypto/lib..__nrf__subsys__bootloader__bl_crypto.a  modules/nrf/subsys/bootloader/bl_validation/lib..__nrf__subsys__bootloader__bl_validation.a  modules/nrf/subsys/bootloader/bl_storage/lib..__nrf__subsys__bootloader__bl_storage.a  modules/nrf/subsys/fw_info/lib..__nrf__subsys__fw_info.a  modules/nrf/drivers/hw_cc310/lib..__nrf__drivers__hw_cc310.a  modules/nordic/lib..__modules__hal__nordic.a  -Wl,--no-whole-archive  zephyr/kernel/libkernel.a  zephyr/CMakeFiles/offsets.dir/./arch/arm/core/offsets/offsets.c.obj  -L"/Users/denis/sandbox/gcc-arm-none-eabi-9-2019-q4-major/bin/../lib/gcc/arm-none-eabi/9.2.1/thumb/v8-m.main/nofp"  -L/Users/denis/sandbox/denisbohm/firefly-go-kart/blinky/build/b0/zephyr  -lgcc  -Wl,--print-memory-usage  zephyr/arch/common/libisr_tables.a  /Users/denis/sandbox/ncs/nrfxlib/crypto/nrf_oberon/lib/cortex-m33/soft-float/liboberon_3.0.7.a  /Users/denis/sandbox/ncs/nrfxlib/crypto/nrf_cc312_platform/lib/cortex-m33/soft-float/no-interrupts/libnrf_cc312_platform_0.9.4.a  -mthumb  -mabi=aapcs  -Wl,--gc-sections  -Wl,--build-id=none  -Wl,--sort-common=descending  -Wl,--sort-section=alignment  -Wl,-u,_OffsetAbsSyms  -Wl,-u,_ConfigAbsSyms  -nostdlib  -static  -no-pie  -Wl,-X  -Wl,-N  -Wl,--orphan-handling=warn && :

Memory region         Used Size  Region Size  %age Used

           FLASH:       29484 B        16 KB    179.96%

            SRAM:        6096 B       504 KB      1.18%

        IDT_LIST:          40 B         2 KB      1.95/Users/denis/sandbox/gcc-arm-none-eabi-9-2019-q4-major/bin/../lib/gcc/arm-none-eabi/9.2.1/../../../../arm-none-eabi/bin/ld: zephyr/zephyr_prebuilt.elf section `text' will not fit in region `FLASH'

/Users/denis/sandbox/gcc-arm-none-eabi-9-2019-q4-major/bin/../lib/gcc/arm-none-eabi/9.2.1/../../../../arm-none-eabi/bin/ld: region `FLASH' overflowed by 13100 bytes

collect2: error: ld returned 1 exit status

%

ninja: build stopped: subcommand failed.

[149/173] Linking C executable zephyr/zephyr_prebuilt.elf

Memory region         Used Size  Region Size  %age Used

           FLASH:       18592 B     458240 B      4.06%

            SRAM:        5648 B       504 KB      1.09%

        IDT_LIST:          56 B         2 KB      2.73%

[151/173] Building C object zephyr/CMakeFiles/zephyr_final.dir/isr_tables.c.obj

FAILED: modules/nrf/samples/b0_subimage-prefix/src/b0_subimage-stamp/b0_subimage-build b0/zephyr/zephyr.hex b0/zephyr/zephyr.elf 

cd /Users/denis/sandbox/denisbohm/firefly-go-kart/blinky/build/b0 && /usr/local/Cellar/cmake/3.19.1/bin/cmake --build . --

[154/173] Building C object zephyr/CMakeFiles/zephyr_final.dir/isr_tables.c.obj

ninja: build stopped: subcommand failed.

FATAL ERROR: command exited with status 1: /usr/local/bin/cmake --build /Users/denis/sandbox/denisbohm/firefly-go-kart/blinky/build

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