BOOT LOADER

RE: BOOT LOADER

Vidar Berg — Wed, 28 Mar 2018 09:13:51 GMT

Bootloader sets the BANK_APP_VALID in the final step of the DFU process to validate the app. So the flag will be set after a successful DFU.

RE: BOOT LOADER

ramakrishna — Tue, 27 Mar 2018 14:11:43 GMT

why i am able to flash the application after doing dfu for the first time?

RE: BOOT LOADER

Vidar Berg — Tue, 27 Mar 2018 07:14:03 GMT

The legacy bootloaders do not have the same requirements/format for the bootloader settings page. In SDK 11 it is sufficient to set the BANK_APP_VALID ('1') flag to validate the app:

nrfjprog --memwr 0x7F000 --val 1 // 0x7F000 is the default address for the bootloader settings page

RE: BOOT LOADER

ramakrishna — Tue, 27 Mar 2018 06:51:29 GMT

i am using sdk11 and nrfutil 0.52 so there are no commands

RE: BOOT LOADER

Vidar Berg — Mon, 26 Mar 2018 14:17:56 GMT

The application needs to be validated, otherwise the bootloader will not boot the application on startup. You can do this by manually creating bootloader settings page as outlined here: http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.tools/dita/tools/nrfutil/nrfutil_settings_generate_display.html?cp=5_5_6

then program the generated settings page with jlink:

nrfjprog --program settings.hex --sectorerase -r

RE: BOOT LOADER

ramakrishna — Sat, 24 Mar 2018 05:34:16 GMT

i am flashing like this

1.first softdevice

2.bootloader

3.application

i am flashing first two steps with jlink and 3rd step with dfu for the board to work

Q)if i flash the application with jlink it is not working what is the reason?

Q)where the linker file present and what need to be cahnged?

RE: BOOT LOADER

Vidar Berg — Fri, 23 Mar 2018 12:34:56 GMT

Hi,

The DFU functionality is implemented the bootloader code, so it is necessary to program the bootloader to support DFU. Recommend to read through the following documentation to get an overview of the bootloader architecture: http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v14.2.0/lib_bootloader_modules.html?cp=4_0_0_3_5