SDfile, Bootloadera and Application Files updating using Serial DFU bootloader

RE: SDfile, Bootloadera and Application Files updating using Serial DFU bootloader

Goudra — Mon, 10 Jun 2019 15:16:45 GMT

Thanks, its solve my problem.

RE: SDfile, Bootloadera and Application Files updating using Serial DFU bootloader

Bjørn Kvaale — Mon, 25 Feb 2019 11:10:25 GMT

Hi Basava,

Assuming you are using the secure uart serial bootloader in sdk v15.2, take a look at this function inside the nrf_dfu_ver_validation.c file:

// This function assumes p_init->has_fw_version.
static bool fw_version_ok(dfu_init_command_t const * p_init)
{
    ASSERT(p_init != NULL);
    ASSERT(p_init->has_fw_version);

    if (  (p_init->type == DFU_FW_TYPE_APPLICATION)
       || (p_init->type == DFU_FW_TYPE_SOFTDEVICE))
    {
        return ((p_init->fw_version >= s_dfu_settings.app_version) || !NRF_DFU_APP_DOWNGRADE_PREVENTION);
    }
    else
    {
        return  (p_init->fw_version > s_dfu_settings.bootloader_version);
    }
}

If you change:

return (p_init->fw_version > s_dfu_settings.bootloader_version);

to:

return (p_init->fw_version >= s_dfu_settings.bootloader_version);

I am pretty sure it should work if you still have the same bootloader version as before.

RE: SDfile, Bootloadera and Application Files updating using Serial DFU bootloader

Goudra — Thu, 21 Feb 2019 19:51:56 GMT

Hi Bjorn,

Thank you for the reply,

How we can avoid version check?

Is it possible?

Best Regards,

Basava.

RE: SDfile, Bootloadera and Application Files updating using Serial DFU bootloader

Bjørn Kvaale — Thu, 21 Feb 2019 12:01:50 GMT

Hi Basavanagouda,

It seems like you may need to update the FW version before you do the DFU update a second time (explained in this link):

"Firmware version: If the image contains a bootloader, the image is accepted if the new firmware version is greater than (>) the existing version of the bootloader. If the image contains an application, the image is accepted if the new firmware version is greater than or equal to (>=) the existing version of the application. If the image contains a SoftDevice and no SoftDevice is already present, the fw_version is checked against the existing application's version to determine whether the update can overwrite it."

This documentation assumes you are using sdk v15.2, but you can select the version you are using here:

Also, this blog post could be helpful.

Kind Regards,

Bjørn Kvaale