Device Firmware Update (DFU) with MCUBoot bootloader showing Failed reading sectors; BOOT_MAX_IMG_SECTORS=128 - too small?

[Gireesha]

Hi All,

I am trying to do  Device Firmware Update (DFU) with MCUBoot bootloader for nrf52840 DK and I am following this link https://devzone.nordicsemi.com/guides/nrf-connect-sdk-guides/b/software/posts/device-firmware-update-dfu-with-mcuboot-bootloader, Till 17th step its working as expected but when i run the west flash command I am getting the following error in the board 

*** Booting Zephyr OS build v2.6.99-ncs1-1 ***
I: Starting bootloader
W: Failed reading sectors; BOOT_MAX_IMG_SECTORS=128 - too small?
W: Cannot upgrade: not a compatible amount of sectors
E: Unable to find bootable image

~Thanks in advance

[Gireesha]

Hi Hakon,

Development Environment used: ncs sdk v1.7.1 (Zeyphr RTOS

MCU: nRF52840

It is a custom board and doesn't have reset button. We need to put the custom board into the casing. Currently we are flashing the code using SWD. But now we want to update / flash the firmware using USB. Please let us know how can we achieve this?

What we are trying to achieve is to do DFU / Flashing from USB using MCUBootloader. We followed the following link https://devzone.nordicsemi.com/guides/nrf-connect-sdk-guides/b/software/posts/device-firmware-update-dfu-with-mcuboot-bootloader to achieve it. But we are facing with the below mentioned error.

W: Failed reading sectors; BOOT_MAX_IMG_SECTORS=128 - too small?
W: Cannot upgrade: not a compatible amount of sectors
E: Unable to find bootable image

[Håkon Alseth]

Hi,

 

Here's a quickly edited "blinky" sample, with the changes described in the link you posted:

279429_blinky_mcuboot_cdc.zip

 

This boots as expected on my end. Do you still see issues with this one?

Please note that the mcuboot configuration is located in the child_image directory.

 

Kind regards,

Håkon

[Gireesha]

Hi Hakon,

From the sample example provided by you, We were able to successfully put the device into bootloader mode by pressing the button 1 and reset button and we are able to perform DFU.

But, now in our custom device (nrf52840) doesn't have any button (reset / button). How do we implement this DFU method for our custom board. 

Please help us, matter is very urgent.  

[Håkon Alseth]

Hi,

 

You need some way to reset the device.

 

The only good option if you do not have a nRESET button/signal, is to do a power cycle while holding in the button to enter bootloader serial recovery mode.

 

Kind regards,

Håkon

[Gireesha]

Hi Hakon,

There is no button available on our device. From the application can we reset the device? Is there any sample code to do it?

In our custom board, we power the device by giving 5v to VDDH pin. Is it sufficient to run serial recovery mode?

Any suggestion on this will help us a lot

Thank you