Can't get DFU to work

RE: Can't get DFU to work

Daniel Dakhno — Tue, 13 Jul 2021 16:16:07 GMT

Indeed it turned out that my linker script was incomplete.

devzone.nordicsemi.com/.../8156.freshener_5F00_nrf51.lddemonstrates how it works for me when compiling using armgcc and make.

RE: Can't get DFU to work

Daniel Dakhno — Tue, 13 Jul 2021 15:39:52 GMT

I am using the armgcc folder on the command line with "arm-none-eabi-gcc" as my compiler through "make build".

Here is what I found out:

nrf_dfu_settings.c states

/** @brief  This variable reserves a codepage for bootloader specific settings,
 *          to ensure the compiler doesn't locate any code or variables at his location.
 */
#if defined (__CC_ARM )
    uint8_t  m_dfu_settings_buffer[CODE_PAGE_SIZE] __attribute__((at(BOOTLOADER_SETTINGS_ADDRESS)))
                                                   __attribute__((used));

#elif defined ( __GNUC__ )

    uint8_t m_dfu_settings_buffer[CODE_PAGE_SIZE] __attribute__ ((section(".bootloaderSettings")))
                                                  __attribute__((used));

#elif defined ( __ICCARM__ )

    __no_init __root uint8_t m_dfu_settings_buffer[CODE_PAGE_SIZE] @ BOOTLOADER_SETTINGS_ADDRESS;

#else

    #error Not a valid compiler/linker for m_dfu_settings placement.

#endif

During the compilation, "__GNUC__" seems to be set, which seems to involve

section(".bootloaderSettings"), which is not configured in my linker script.

Is there any adjustment I need to make to my linker script?

RE: Can't get DFU to work

Hung Bui — Tue, 13 Jul 2021 13:54:11 GMT

Hi Daniel,

Did you do any modification to the bootloader ?
What showed in the log looks strange. The m_dfu_settings_buffer should be located in flash at location BOOTLOADER_SETTINGS_ADDRESS ( 0x0003FC00) but in your log it's located at 0x200021e8 which is RAM.
This setting is configurated in nrf_dfu_settings.c . Could you let me know which compiler do you use ?

Have you tried to test updating a very small example using unmodified bootloader from the SDK ? I have a step by step guide here.