Where is the bootloader used by the serial example progect.

[Leo Lin]

Hi Nordic,

I want to use this example to learn bluetooth mesh, but I cannot find the bootloader source code used in this example.

I used vim to view this "serial_nrf52832_xxAA_s132_7_2_0.emProject", but I couldn’t find the bootloader source code.

Can you tell me the bootloader source code of this example?

vim serial_nrf52832_xxAA_s132_7_2_0.emProject

### File content

<!DOCTYPE CrossStudio_Project_File>
<solution Name="serial_nrf52832_xxAA_s132_7.2.0" target="8" version="2">
  <project Name="serial_nrf52832_xxAA_s132_7.2.0">
    <configuration
      Name="Common"
      arm_architecture="v7EM"
      arm_core_type="Cortex-M4"
      arm_endian="Little"
      arm_fp_abi="Hard"
      arm_fpu_type="FPv4-SP-D16"
      arm_linker_heap_size="1024"
      arm_linker_process_stack_size="0"
      arm_linker_stack_size="2048"
      arm_linker_treat_warnings_as_errors="No"
      arm_simulator_memory_simulation_parameter="RWX 00000000,00100000,FFFFFFFF;RWX 20000000,00010000,CDCDCDCD"
      arm_target_device_name="nrf52832_xxAA"
      arm_target_interface_type="SWD"
      c_user_include_directories="include;..;../common/include;$(SDK_ROOT:../../../nRF5_SDK_17.0.2_d674dde)/components/ble/common;$(SDK_ROOT:../../../nRF5_SDK_17.0.2_d674dde)/components/softdevice/common;$(SDK_ROOT:../../../nRF5_SDK_17.0.2_d674dde)/components/libraries/strerror;$(SDK_ROOT:../../../nRF5_SDK_17.0.2_d674dde)/components/libraries/atomic;../../models/foundation/config/include;../../models/foundation/health/include;../../mesh/stack/api;../../mesh/core/api;../../mesh/core/include;../../mesh/access/api;../../mesh/access/include;../../mesh/dfu/api;../../mesh/dfu/include;../../mesh/prov/api;../../mesh/prov/include;../../mesh/bearer/api;../../mesh/bearer/include;../../mesh/gatt/api;../../mesh/gatt/include;../../mesh/friend/api;../../mesh/friend/include;$(SDK_ROOT:../../../nRF5_SDK_17.0.2_d674dde)/components/softdevice/s132/headers/;$(SDK_ROOT:../../../nRF5_SDK_17.0.2_d674dde)/components/softdevice/s132/headers/nrf52/;$(SDK_ROOT:../../../nRF5_SDK_17.0.2_d674dde)/modules/nrfx;$(SDK_ROOT:../../../nRF5_SDK_17.0.2_d674dde)/modules/nrfx/mdk;$(SDK_ROOT:../../../nRF5_SDK_17.0.2_d674dde)/modules/nrfx/hal;$(SDK_ROOT:../../../nRF5_SDK_17.0.2_d674dde)/components/toolchain/cmsis/include;$(SDK_ROOT:../../../nRF5_SDK_17.0.2_d674dde)/components/toolchain/gcc;$(SDK_ROOT:../../../nRF5_SDK_17.0.2_d674dde)/components/toolchain/cmsis/dsp/GCC;$(SDK_ROOT:../../../nRF5_SDK_17.0.2_d674dde)/components/boards;../../mesh/serial/api;../../mesh/serial/include;$(SDK_ROOT:../../../nRF5_SDK_17.0.2_d674dde)/integration/nrfx;$(SDK_ROOT:../../../nRF5_SDK_17.0.2_d674dde)/components/libraries/util;$(SDK_ROOT:../../../nRF5_SDK_17.0.2_d674dde)/components/libraries/timer;$(SDK_ROOT:../../../nRF5_SDK_17.0.2_d674dde)/components/libraries/log;$(SDK_ROOT:../../../nRF5_SDK_17.0.2_d674dde)/components/libraries/log/src;$(SDK_ROOT:../../../nRF5_SDK_17.0.2_d674dde)/components/libraries/experimental_section_vars;$(SDK_ROOT:../../../nRF5_SDK_17.0.2_d674dde)/components/libraries/delay;$(SDK_ROOT:../../../nRF5_SDK_17.0.2_d674dde)/modules/nrfx/drivers/include;$(SDK_ROOT:../../../nRF5_SDK_17.0.2_d674dde)/modules/nrfx/drivers;../../external/micro-ecc;../../mesh/core/include;../../external/rtt/include;"
      c_preprocessor_definitions="NO_VTOR_CONFIG;PERSISTENT_STORAGE=0;USE_APP_CONFIG;CONFIG_APP_IN_CORE;NRF52_SERIES;NRF52832;NRF52832_XXAA;S132;SOFTDEVICE_PRESENT;NRF_SD_BLE_API_VERSION=7;BOARD_PCA10040;CONFIG_GPIO_AS_PINRESET"
      debug_target_connection="J-Link"
      
      debug_additional_load_file="$(SDK_ROOT:../../../nRF5_SDK_17.0.2_d674dde)/components/softdevice/s132/hex/s132_nrf52_7.2.0_softdevice.hex"
      
      debug_start_from_entry_point_symbol="No"
      linker_output_format="hex"
      linker_printf_width_precision_supported="Yes"
      linker_section_placement_file="$(ProjectDir)/flash_placement.xml"
      linker_section_placement_macros="FLASH_PH_START=0x0;FLASH_PH_SIZE=0x78000;RAM_PH_START=0x20000000;RAM_PH_SIZE=0xf000;FLASH_START=0x26000;RAM_START=0x20002df0"
      linker_section_placements_segments="FLASH RX 0x0 0x78000;RAM1 RWX 0x20000000 0xf000"
      project_directory=""
      macros="CMSIS_CONFIG_TOOL=$(SDK_ROOT:../../../nRF5_SDK_17.0.2_d674dde)/external_tools/cmsisconfig/CMSIS_Configuration_Wizard.jar"
      project_type="Executable" />

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      <file file_name="../common/src/mesh_adv.c" />
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      <file file_name="../common/src/nrf_mesh_weak.c" />
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      <file file_name="../../mesh/serial/src/serial_bearer.c" />
      <file file_name="../../mesh/serial/src/serial_handler_common.c" />
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      <file file_name="../../mesh/serial/src/serial_handler_config.c" />
      <file file_name="../../mesh/serial/src/serial_handler_openmesh.c" />
      <file file_name="../../mesh/serial/src/serial.c" />
      <file file_name="../../mesh/serial/src/serial_handler_prov.c" />
      <file file_name="../../mesh/serial/src/serial_handler_dfu.c" />
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      <file file_name="../../mesh/serial/src/serial_handler_models.c" />
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      <file file_name="../../mesh/serial/src/nrf_mesh_serial.c" />
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      <file file_name="$(StudioDir)/source/thumb_crt0.s" />
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      <file file_name="../../mesh/bearer/src/adv_packet_filter.c" />
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      <file file_name="../../mesh/bearer/src/rssi_filter.c" />
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    <folder Name="SEGGER RTT">
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      <file file_name="../../external/rtt/src/SEGGER_RTT_printf.c" />
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      <file file_name="../../external/micro-ecc/uECC.c" >
        <configuration
          Name="Common"
          c_preprocessor_definitions="uECC_OPTIMIZATION_LEVEL=2;uECC_SUPPORTS_secp160r1=0;uECC_SUPPORTS_secp192r1=0;uECC_SUPPORTS_secp224r1=0;uECC_SUPPORTS_secp256r1=1;uECC_SUPPORTS_secp256k1=0;uECC_SUPPORT_COMPRESSED_POINT=0"
          gcc_omit_frame_pointer="Yes" />
      </file>
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    <folder Name="nRF5 SDK">
      <file file_name="$(SDK_ROOT:../../../nRF5_SDK_17.0.2_d674dde)/modules/nrfx/drivers/src/nrfx_gpiote.c" />
      <file file_name="$(SDK_ROOT:../../../nRF5_SDK_17.0.2_d674dde)/components/libraries/util/app_util_platform.c" />
      <file file_name="$(SDK_ROOT:../../../nRF5_SDK_17.0.2_d674dde)/components/ble/common/ble_advdata.c" />
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  </project>
  <configuration Name="Debug"
                 arm_use_builtins="Yes"
                 gcc_debugging_level="Level 3"
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                 build_output_directory="build/$(ProjectName)_$(Configuration)">
  </configuration>
  <configuration Name="ReleaseWithDebugInformation"
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                 gcc_entry_point="Reset_Handler"
                 build_intermediate_directory="build/$(ProjectName)_$(Configuration)/obj"
                 build_output_directory="build/$(ProjectName)_$(Configuration)">
  </configuration>
</solution>

Thanks in advance.

Leo.

[Elfving]

Hey Leo! Sorry about the late response.

Leo Lin said:

Q1- Do you mean that this example does not have a bootloader FW? Only softdevice FW and application FW are needed?

Yes

Leo Lin said:

Q2- So I used the "Interactive PyACI script" to send the "Direct Firmware Upgrade Jump To Bootloader" command. The device only reboots, but does not jump to bootloader mode, because this example does not have a bootloader FW? Right?

Yes, I believe so.

Leo Lin said:

And the function nrf_mesh_dfu_jump_to_bootloader has been changed so that when I give instructions, the code that jumps to bootloader mode will be executed.

Leo Lin said:

I entered the command, but the device only reboots, but does not enter the bootloader mode.

I see, now you have found a way to reboot the device, which would reboot it to the bootloader if there was one (but still not necessarily the bootloader mode btw, or that depends on what you mean by it). 

I think there might be a misunderstanding about the difference between bootloader, bootloader mode, DFU and DFU mode here. The bootloader is responsible for booting and updating the FW. Updating the FW can be done using a DFU. In order for it to do that, the bootloader needs to trigger the DFU mode. "Bootloader mode" is a term that has been mostly used about the DFU mode on the debugger chip on the DK (not the nRF SoC), and sometimes as something synonymous with DFU mode. It might be confusing, but just make sure that you know the difference between the bootloader and the DFU mode.

In order for something to enter DFU mode, it needs to reboot (in order for it to enter bootloader) and then the GPREGISTER needs to be set. This can be done directly, or using the buttonless DFU service or by simply holding Button 4 when powering it up. 

For more of a step by step tutorial on how to incorporate Mesh DFU into your map you could see here. (Though I once again want you to be sure that Mesh DFU is what you want, since you don't have to use Mesh DFU even though you are using a Mesh application. )

And btw, are you using the mesh version of nrfutil?

Best regards,

Elfving