title: Zephyr build error when trying to switch board target
body: <p>I am trying to build zephyr sample code that is meant for board A for board B (i.e. build was written for code A but I need to change it so that it works with board B). I keep coming across this error and I am not sure how to get past it. I have replaced the <code>/board</code>, <code>/soc</code>, and <code>/dts</code> subfolders with appropriate files for my board. I changed the Makefile to target my board and it is successfully finding it.</p>
  <p>This is the error:</p>
  <pre><code>cmake -B build -DBOARD=my_project_name ./
  -- Using out-of-tree SOC definition
  -- Zephyr version: 2.2.0
  -- Found PythonInterp: /opt/homebrew/bin/python3.6 (found suitable version &quot;3.6.2&quot;, minimum required is &quot;3.6&quot;) 
  -- git describe failed: fatal: Not a git repository (or any of the parent directories): .git;
     BUILD_VERSION is left undefined
  -- Selected BOARD my_project_name
  -- Found west: /usr/local/bin/west (found suitable version &quot;0.7.2&quot;, minimum required is &quot;0.6.0&quot;)
  -- Loading /Users/my_name/file_dir/Firmware/projects/my_project_name/boards/arm/my_project_name/my_project_name.dts as base
  Devicetree header saved to '/Users/my_name/file_dir/Firmware/projects/my_project_name/build/zephyr/include/generated/devicetree_unfixed.h'
  Parsing /Users/my_name/third-party/zephyr/zephyr_rtos/v2.2.0/zephyr/Kconfig
  Loaded configuration '/Users/my_name/file_dir/Firmware/projects/my_project_name/boards/arm/my_project_name/my_project_name_defconfig'
  Merged configuration '/Users/my_name/file_dir/Firmware/projects/my_project_name/prj.conf'
  Configuration saved to '/Users/my_name/file_dir/Firmware/projects/my_project_name/build/zephyr/.config'
  Kconfig header saved to '/Users/my_name/file_dir/Firmware/projects/my_project_name/build/zephyr/include/generated/autoconf.h'
  -- The C compiler identification is GNU 8.2.1
  -- The CXX compiler identification is GNU 8.2.1
  -- The ASM compiler identification is GNU
  -- Found assembler: /Users/my_name/file_dir/third-party/toolchains/gcc-arm-none-eabi-8-2018/arm-gcc-macos/bin/arm-none-eabi-gcc
  -- Cache files will be written to: /Users/my_name/Library/Caches/zephyr
  -- Configuring done
  -- Generating done
  -- Build files have been written to: /Users/my_name/file_dir/Firmware/projects/my_project_name/build
  make -C build
  Scanning dependencies of target driver_validation_h_target
  [  1%] Generating include/generated/driver-validation.h
  [  1%] Built target driver_validation_h_target
  Scanning dependencies of target kobj_types_h_target
  [  2%] Generating include/generated/kobj-types-enum.h, include/generated/otype-to-str.h
  [  2%] Built target kobj_types_h_target
  Scanning dependencies of target syscall_list_h_target
  [  2%] Generating misc/generated/syscalls.json
  [  3%] Generating include/generated/syscall_dispatch.c, include/generated/syscall_list.h
  [  5%] Built target syscall_list_h_target
  Scanning dependencies of target offsets
  [  6%] Building C object zephyr/CMakeFiles/offsets.dir/arch/arm/core/offsets/offsets.c.obj
  In file included from /Users/my_name/file_dir/third-party/zephyr/zephyr_rtos/v2.2.0/zephyr/arch/arm/include/aarch32/cortex_m/stack.h:23,
                   from /Users/my_name/file_dir/third-party/zephyr/zephyr_rtos/v2.2.0/zephyr/arch/arm/include/kernel_arch_data.h:33,
                   from /Users/my_name/file_dir/third-party/zephyr/zephyr_rtos/v2.2.0/zephyr/arch/arm/core/offsets/offsets_aarch32.c:26,
                   from /Users/my_name/file_dir/third-party/zephyr/zephyr_rtos/v2.2.0/zephyr/arch/arm/core/offsets/offsets.c:12:
  /Users/my_name/file_dir/third-party/zephyr/zephyr_rtos/v2.2.0/zephyr/include/arch/arm/aarch32/cortex_m/cmsis.h:92:2: error: #error &quot;DT_NUM_IRQ_PRIO_BITS and __NVIC_PRIO_BITS are not set to the same value.&quot;
   #error &quot;DT_NUM_IRQ_PRIO_BITS and __NVIC_PRIO_BITS are not set to the same value.&quot;
    ^~~~~
  make[3]: *** [zephyr/CMakeFiles/offsets.dir/arch/arm/core/offsets/offsets.c.obj] Error 1
  make[2]: *** [zephyr/CMakeFiles/offsets.dir/all] Error 2
  make[1]: *** [all] Error 2
  make: *** [zephyr_project] Error 2
  </code></pre>
  <p>I have already checked to make sure that <code>soc.h</code> has <code>#include &lt;devicetree.h&gt;</code>. I'm not sure what else I can try now so any help is appreciated. Thanks!</p>