Merged bootloader+settings+SD+app not working

Question

Hello, 
 Issue: after successfully compiling, generating bootloader settings, merging and flashing bootloader+settings+sd+app, the device enters DFU mode while i was expecting to run the app. 
 
 I'm developing a solution based on a nRF52832 with a custom board, softdevice S112 version 7.0.2, with SDK 17.0.2. 
 I have successfully built the micro_eec library, and bootloader from $(SDK)/examples/dfu/secure_bootloader/pca10040e_s112_ble. 
 My app is tested working when flashing with no bootloader (erase device, flash the softdevice and app). My app also uses two flash pages to store data, as per this definition: 
 
 NRF_FSTORAGE_DEF(nrf_fstorage_t my_flash) = 
 { 
 .evt_handler = flash_callback, 
 .start_addr = 0x7E000, 
 .end_addr = 0x7FFFF, 
 };

Bootloader setting is generated successfully with the following line: 
 
 nrfutil settings generate --family NRF52 --application $(OUTPUT_DIRECTORY)/nrf52810_xxaa.hex --application-version 0 --bootloader-version 0 --bl-settings-version 2 $(OUTPUT_DIRECTORY)/bootloader_setting.hex 
 
 Here is the output: 
 Bootloader DFU Settings: * File: _build/bootloader_setting.hex * Family: nRF52 * Start Address: 0x0007F000 * CRC: 0x3879A3DC * Settings Version: 0x00000002 (2) * App Version: 0x00000000 (0) * Bootloader Version: 0x00000000 (0) * Bank Layout: 0x00000000 * Current Bank: 0x00000000 * Application Size: 0x0000D8A4 (55460 bytes) * Application CRC: 0x74ED94AE * Bank0 Bank Code: 0x00000001 * Softdevice Size: 0x00000000 (0 bytes) * Boot Validation CRC: 0xFEBF7781 * SD Boot Validation Type: 0x00000000 (0) * App Boot Validation Type: 0x00000001 (1) 
 
 Bootloader project linker config file: 
 /* Linker script to configure memory regions. */

SEARCH_DIR(.)
GROUP(-lgcc -lc -lnosys)

MEMORY
{
 FLASH (rx) : ORIGIN = 0x28000, LENGTH = 0x6000
 RAM (rwx) : ORIGIN = 0x200022c8, LENGTH = 0x3d38
 uicr_bootloader_start_address (r) : ORIGIN = 0x10001014, LENGTH = 0x4
 uicr_mbr_params_page (r) : ORIGIN = 0x10001018, LENGTH = 0x4
 mbr_params_page (r) : ORIGIN = 0x0002E000, LENGTH = 0x1000
 bootloader_settings_page (r) : ORIGIN = 0x0002F000, LENGTH = 0x1000
}

SECTIONS
{
 . = ALIGN(4);
 .uicr_bootloader_start_address :
 {
 PROVIDE(__start_uicr_bootloader_start_address = .);
 KEEP(*(SORT(.uicr_bootloader_start_address*)))
 PROVIDE(__stop_uicr_bootloader_start_address = .);
 } > uicr_bootloader_start_address
 . = ALIGN(4);
 .uicr_mbr_params_page :
 {
 PROVIDE(__start_uicr_mbr_params_page = .);
 KEEP(*(SORT(.uicr_mbr_params_page*)))
 PROVIDE(__stop_uicr_mbr_params_page = .);
 } > uicr_mbr_params_page
 . = ALIGN(4);
 .mbr_params_page(NOLOAD) :
 {
 PROVIDE(__start_mbr_params_page = .);
 KEEP(*(SORT(.mbr_params_page*)))
 PROVIDE(__stop_mbr_params_page = .);
 } > mbr_params_page
 . = ALIGN(4);
 .bootloader_settings_page(NOLOAD) :
 {
 PROVIDE(__start_bootloader_settings_page = .);
 KEEP(*(SORT(.bootloader_settings_page*)))
 PROVIDE(__stop_bootloader_settings_page = .);
 } > bootloader_settings_page
}

SECTIONS
{
 . = ALIGN(4);
 .mem_section_dummy_ram :
 {
 }
 .log_dynamic_data :
 {
 PROVIDE(__start_log_dynamic_data = .);
 KEEP(*(SORT(.log_dynamic_data*)))
 PROVIDE(__stop_log_dynamic_data = .);
 } > RAM
 .log_filter_data :
 {
 PROVIDE(__start_log_filter_data = .);
 KEEP(*(SORT(.log_filter_data*)))
 PROVIDE(__stop_log_filter_data = .);
 } > RAM
 .fs_data :
 {
 PROVIDE(__start_fs_data = .);
 KEEP(*(.fs_data))
 PROVIDE(__stop_fs_data = .);
 } > RAM

} INSERT AFTER .data;

SECTIONS
{
 .mem_section_dummy_rom :
 {
 }
 .crypto_data :
 {
 PROVIDE(__start_crypto_data = .);
 KEEP(*(SORT(.crypto_data*)))
 PROVIDE(__stop_crypto_data = .);
 } > FLASH
 .log_const_data :
 {
 PROVIDE(__start_log_const_data = .);
 KEEP(*(SORT(.log_const_data*)))
 PROVIDE(__stop_log_const_data = .);
 } > FLASH
 .nrf_queue :
 {
 PROVIDE(__start_nrf_queue = .);
 KEEP(*(.nrf_queue))
 PROVIDE(__stop_nrf_queue = .);
 } > FLASH
 .dfu_trans :
 {
 PROVIDE(__start_dfu_trans = .);
 KEEP(*(SORT(.dfu_trans*)))
 PROVIDE(__stop_dfu_trans = .);
 } > FLASH
 .nrf_balloc :
 {
 PROVIDE(__start_nrf_balloc = .);
 KEEP(*(.nrf_balloc))
 PROVIDE(__stop_nrf_balloc = .);
 } > FLASH
 .svc_data :
 {
 PROVIDE(__start_svc_data = .);
 KEEP(*(.svc_data))
 PROVIDE(__stop_svc_data = .);
 } > FLASH
 .sdh_ble_observers :
 {
 PROVIDE(__start_sdh_ble_observers = .);
 KEEP(*(SORT(.sdh_ble_observers*)))
 PROVIDE(__stop_sdh_ble_observers = .);
 } > FLASH
 .sdh_req_observers :
 {
 PROVIDE(__start_sdh_req_observers = .);
 KEEP(*(SORT(.sdh_req_observers*)))
 PROVIDE(__stop_sdh_req_observers = .);
 } > FLASH
 .sdh_state_observers :
 {
 PROVIDE(__start_sdh_state_observers = .);
 KEEP(*(SORT(.sdh_state_observers*)))
 PROVIDE(__stop_sdh_state_observers = .);
 } > FLASH
 .sdh_stack_observers :
 {
 PROVIDE(__start_sdh_stack_observers = .);
 KEEP(*(SORT(.sdh_stack_observers*)))
 PROVIDE(__stop_sdh_stack_observers = .);
 } > FLASH
 .sdh_soc_observers :
 {
 PROVIDE(__start_sdh_soc_observers = .);
 KEEP(*(SORT(.sdh_soc_observers*)))
 PROVIDE(__stop_sdh_soc_observers = .);
 } > FLASH

} INSERT AFTER .text

INCLUDE "nrf_common.ld" 
 
 App project linker config file: 
 /* Linker script to configure memory regions. */

SEARCH_DIR(.)
GROUP(-lgcc -lc -lnosys)

MEMORY
{
 FLASH (rx) : ORIGIN = 0x19000, LENGTH = 0x17000
 RAM (rwx) : ORIGIN = 0x200022c8, LENGTH = 0x3d38
}

SECTIONS
{
}

SECTIONS
{
 . = ALIGN(4);
 .mem_section_dummy_ram :
 {
 }
 .cli_sorted_cmd_ptrs :
 {
 PROVIDE(__start_cli_sorted_cmd_ptrs = .);
 KEEP(*(.cli_sorted_cmd_ptrs))
 PROVIDE(__stop_cli_sorted_cmd_ptrs = .);
 } > RAM
 .fs_data :
 {
 PROVIDE(__start_fs_data = .);
 KEEP(*(.fs_data))
 PROVIDE(__stop_fs_data = .);
 } > RAM
 .log_dynamic_data :
 {
 PROVIDE(__start_log_dynamic_data = .);
 KEEP(*(SORT(.log_dynamic_data*)))
 PROVIDE(__stop_log_dynamic_data = .);
 } > RAM
 .log_filter_data :
 {
 PROVIDE(__start_log_filter_data = .);
 KEEP(*(SORT(.log_filter_data*)))
 PROVIDE(__stop_log_filter_data = .);
 } > RAM

} INSERT AFTER .data;

SECTIONS
{
 .mem_section_dummy_rom :
 {
 }
 .sdh_soc_observers :
 {
 PROVIDE(__start_sdh_soc_observers = .);
 KEEP(*(SORT(.sdh_soc_observers*)))
 PROVIDE(__stop_sdh_soc_observers = .);
 } > FLASH
 .sdh_ble_observers :
 {
 PROVIDE(__start_sdh_ble_observers = .);
 KEEP(*(SORT(.sdh_ble_observers*)))
 PROVIDE(__stop_sdh_ble_observers = .);
 } > FLASH
 .pwr_mgmt_data :
 {
 PROVIDE(__start_pwr_mgmt_data = .);
 KEEP(*(SORT(.pwr_mgmt_data*)))
 PROVIDE(__stop_pwr_mgmt_data = .);
 } > FLASH
 .sdh_req_observers :
 {
 PROVIDE(__start_sdh_req_observers = .);
 KEEP(*(SORT(.sdh_req_observers*)))
 PROVIDE(__stop_sdh_req_observers = .);
 } > FLASH
 .sdh_state_observers :
 {
 PROVIDE(__start_sdh_state_observers = .);
 KEEP(*(SORT(.sdh_state_observers*)))
 PROVIDE(__stop_sdh_state_observers = .);
 } > FLASH
 .sdh_stack_observers :
 {
 PROVIDE(__start_sdh_stack_observers = .);
 KEEP(*(SORT(.sdh_stack_observers*)))
 PROVIDE(__stop_sdh_stack_observers = .);
 } > FLASH
 .nrf_queue :
 {
 PROVIDE(__start_nrf_queue = .);
 KEEP(*(.nrf_queue))
 PROVIDE(__stop_nrf_queue = .);
 } > FLASH
 .nrf_balloc :
 {
 PROVIDE(__start_nrf_balloc = .);
 KEEP(*(.nrf_balloc))
 PROVIDE(__stop_nrf_balloc = .);
 } > FLASH
 .cli_command :
 {
 PROVIDE(__start_cli_command = .);
 KEEP(*(.cli_command))
 PROVIDE(__stop_cli_command = .);
 } > FLASH
 .crypto_data :
 {
 PROVIDE(__start_crypto_data = .);
 KEEP(*(SORT(.crypto_data*)))
 PROVIDE(__stop_crypto_data = .);
 } > FLASH
 .log_const_data :
 {
 PROVIDE(__start_log_const_data = .);
 KEEP(*(SORT(.log_const_data*)))
 PROVIDE(__stop_log_const_data = .);
 } > FLASH
 .log_backends :
 {
 PROVIDE(__start_log_backends = .);
 KEEP(*(SORT(.log_backends*)))
 PROVIDE(__stop_log_backends = .);
 } > FLASH

} INSERT AFTER .text

INCLUDE "nrf_common.ld"

i have no warnings when merging (ie, no overlap) 
 
 Thanks, 
 Martin

Einar Thorsrud · Accepted Answer

I do not see any problems here, and when I test the bootloader starts the application right away, also after repeated resets. 
 However, I see that you have NRF_BL_DFU_ENTER_METHOD_BUTTON set to 1 and NRF_BL_DFU_ENTER_METHOD_BUTTON_PIN set to 16 in the bootloader's sdk_config.h. That is also the pin of your LED2_PIN in your application. The bootloader will configure this pin as an input and decide based on that if it should enter bootloader mode or start the application (if the pin is 0, enter DFU mode). Note that if this is the problem will immediately be obvious if you use the debug bootloader with RTT logging, as that prints the reason for entering DFU mode. 
 If you do not want to use the pin method to enter bootloader mode, set NRF_BL_DFU_ENTER_METHOD_BUTTON to 0.

Merged bootloader+settings+SD+app not working

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