[SDK12][PCA10040]ble_app_buttonless_dfu not resetting to bootloader

Question

Hi, 
 I have modified my files as mentioned here . When I upload the package, the template device show and I am able to connect. But when I subscribe to the notification and write 0x01, the device doesn't reboot. 
 In bootloader log it asks to change the ram start address: 
 :INFO:Inside main
:INFO:In nrf_bootloader_init
:INFO:In real nrf_dfu_init
:INFO:running nrf_dfu_settings_init
:INFO:!!!!!!!!!!!!!!! Resetting bootloader settings !!!!!!!!!!!
:INFO:Erasing old settings at: 0x0007f000
:INFO:Erasing: 0x0007f000, num: 1
:INFO:Writing 0x00000057 words
:INFO:Writing settings...
:INFO:Enter nrf_dfu_continue
:INFO:Single: Invalid bank
:INFO:Enter nrf_dfu_app_is_valid
:INFO:Return false in valid app check
:INFO:In nrf_dfu_transports_init
:INFO:num transports: 1
:INFO:vector table: 0x00075000
SDH:INFO:sd_ble_enable: RAM START at 0x20002c00
SDH:WARNING:sd_ble_enable: app_ram_base should be adjusted to 0x20002798
SDH:WARNING:ram size should be adjusted to 0xd868 
:INFO:After nrf_dfu_transports_init
:INFO:------- nrf_dfu_flash_init-------
:INFO:Waiting for events
 
 Here is the log without changing the base address: 
 SDH:INFO:sd_ble_enable: RAM START at 0x20002128
:INFO:running nrf_dfu_settings_init
:INFO:!!!!!!!!!!!!!!! Resetting bootloader settings !!!!!!!!!!!
:INFO:Erasing old settings at: 0x200021ac
:INFO:Erasing: 0x200021ac, num: 1
:INFO:Erase failed: 6
:INFO:Failed to erase bootloader settings
APP:INFO:Indication for BLE_DFU is enabled
APP:INFO:Indication for BLE_DFU is disabled
APP:INFO:Indication for BLE_DFU is enabled
APP:INFO:Device is entering bootloader mode!
:INFO:Erasing old settings at: 0x200021ac
:INFO:Erasing: 0x200021ac, num: 1
:INFO:Erase failed: 6
:INFO:Failed to erase bootloader settings
 
 Here is the log after changing the address: 
 SDH:INFO:sd_ble_enable: RAM START at 0x20002128
:INFO:running nrf_dfu_settings_init
:INFO:!!!!!!!!!!!!!!! Resetting bootloader settings !!!!!!!!!!!
:INFO:Erasing old settings at: 0x200021ac
:INFO:Erasing: 0x200021ac, num: 1
:INFO:Erase failed: 6
:INFO:Failed to erase bootloader settings
APP:INFO:Indication for BLE_DFU is enabled
APP:INFO:Device is entering bootloader mode!
:INFO:Erasing old settings at: 0x200021ac
:INFO:Erasing: 0x200021ac, num: 1
:INFO:Erase failed: 6
:INFO:Failed to erase bootloader settings
 
 I have tried with both debug bootloader and normal one, the problem remains the same. I am using GCC on Linux. Please help. 
 Thanks in advance :) 
 
 [EDIT] 
 When I power on the board with BUTTON 4 pressed, the device starts in bootloader mode. Here is the log: 
 :INFO:Inside main
:INFO:In nrf_bootloader_init
:INFO:In real nrf_dfu_init
:INFO:running nrf_dfu_settings_init
:INFO:Enter nrf_dfu_continue
:INFO:Valid App
:INFO:Application sent bootloader request
:INFO:In nrf_dfu_transports_init
:INFO:num transports: 1
:INFO:vector table: 0x00075000
SDH:INFO:sd_ble_enable: RAM START at 0x20002c00
SDH:WARNING:sd_ble_enable: app_ram_base should be adjusted to 0x20002798
SDH:WARNING:ram size should be adjusted to 0xd868 
:INFO:After nrf_dfu_transports_init
:INFO:------- nrf_dfu_flash_init-------
:INFO:Waiting for events
 
 Also LED3 and LED1 are turned on in this state, not LED4. If I connect LED2 will turn on and LED1 will turn off. I guess this is the desired result right? 
 
 [EDIT] 
 This is the process that I'm following: 
 
 
 Erase the flash 
 
 
 Program Softdevice from buttonless_dfu Makefile using make flash_softdevice 
 
 
 Program bootloader_secure from pca10040_debug Makefile using make flash 
 
 
 Create package in buttonless_dfu directory using 
 nrfutil pkg generate --debug-mode --key-file priv.pem --application _build/nrf52832_xxaa.hex pkg.zip 
 
 
 Transfer the zip to phone and upload using nrfConnect 
 
 
 Successfully upload the file 
 
 
 Device resets. 
 
 
 Connect to the device and enable notification on the unknown characteristic 
 
 
 Write 0x01 on the characteristic 
 
 
 The received response is 20-01-01, and the logs are as mentioned in the question. 
 
 
 I hope I am not doing anything wrong here.

Keton · Accepted Answer

Update .zip: dfu.zip 
 bootloader nrf52832_xxaa_s132.hex 
 EDIT: 
 I took a look how bootloader setting address is defined and this seems like relevant part: 
 #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));
 
 So for Keil you have a fixed address but for gcc there should be a custom section in linker file named ".bootloaderSettings" . Question is have you implemented it? I think that it should be placed in both bootloader and application linker file. 
 And this is very similar to fstorage bug form SDK11 where the difference between Keil and gcc was exactly the same as here - fixed flash address vs. custom section. 
 EDIT2: 
 Following linker file for buttonless_dfu app fixes the problem: 
 /* Linker script to configure memory regions. */

SEARCH_DIR(.)
GROUP(-lgcc -lc -lnosys)

MEMORY
{
 FLASH (rx) : ORIGIN = 0x1f000, LENGTH = 0x61000
 RAM (rwx) : ORIGIN = 0x20002128, LENGTH = 0xded8
 
 /** Location of bootloader setting in flash. */
 BOOTLOADER_SETTINGS (rw) : ORIGIN = 0x0007F000, LENGTH = 0x1000
}

SECTIONS
{
 /* Place the bootloader settings page in flash. */
 .bootloaderSettings(NOLOAD) :
 {

 } > BOOTLOADER_SETTINGS
 
 .fs_data :
 {
 PROVIDE(__start_fs_data = .);
 KEEP(*(.fs_data))
 PROVIDE(__stop_fs_data = .);
 } > RAM
} INSERT AFTER .data;

INCLUDE "nrf5x_common.ld"
 
 Original one was lacking .bootloaderSettings section

[SDK12][PCA10040]ble_app_buttonless_dfu not resetting to bootloader

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