Secure Bootloader and repeated flash storage in NCS v1.4.2

Question

Hi, 
 1. I have implement DFU example without private key (open bootloader !) . How to implement secure bootloader for NCS . 
 2. when i use the DFU with hid_keyboard the Flash storage starts at 0xFE000, and every restart device the DFU* setup alone write 32bytes at every power resets. how to control it

Sunil vignesh · Accepted Answer

Hi Simon, I have created new ticket https://devzone.nordicsemi.com/f/nordic-q-a/78838/flash-storage-unable-to-write-and-read-1024-and-2048-bytes

as clearly

1. The adding DFU the starting address moved from F5000 / F8000 to FE000 and uses 2 pages to store pairing data and ble settings . but i can't able to write my own data

2. for bootloader i used

prj.conf

# Added for FOTA
CONFIG_BOOTLOADER_MCUBOOT=y
CONFIG_MCUMGR=y
CONFIG_MCUMGR_CMD_OS_MGMT=y
CONFIG_MCUMGR_CMD_IMG_MGMT=y
CONFIG_MCUMGR_SMP_BT=y
CONFIG_IMG_ERASE_PROGRESSIVELY=y
CONFIG_MCUMGR_SMP_BT_AUTHEN=n

in main.c

// For FOTA
#include <tinycbor/cbor.h>
#include "cborattr/cborattr.h"
#include <mgmt/mgmt.h>
#include <mgmt/mcumgr/smp_bt.h>
#include <mgmt/mcumgr/buf.h>
#include <mgmt/mcumgr/smp.h>
#include "os_mgmt/os_mgmt.h"
#include "os_mgmt/os_mgmt_impl.h"
#include "os_mgmt/os_mgmt_config.h"
#include "img_mgmt/image.h"
#include "img_mgmt/img_mgmt.h"
#include "img_mgmt/img_mgmt_impl.h"
#include "img_mgmt/img_mgmt_config.h"

...
...
void main()
{
..
...
 // For FOTA
        os_mgmt_register_group();
        img_mgmt_register_group();
        smp_bt_register();
        for(;;)
        {
        }
}

Secure Bootloader and repeated flash storage in NCS v1.4.2

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