Can I download new image in the place of application ?

[RAM_MS]

As per DFU concept the image management command handlers makes it possible to upload, list, test and confirm the image(s), while the OS management command handlers makes it possible to reset the chip (and run the echo command). Since the DFU support is added to the application, the chip needs to be reset, to give control to MCUboot, which will validate the new uploaded image and swap it with the old image.

But I want to erase old image 1st then download new image using DFU because my application is occupy 90 % of memory so vacant space is not available to download new image and it is hard to add external flash memory because hardware design is completed.

How to do it ?

Any settings is there to do so.

Thanks ,

ram

[Einar Thorsrud]

Hi Ram,

Which transport do you use for DFU?

MCUboot does not have any other transport than serial, and that is for serial recovery. If you want another transport (like Bluetooth) or more features than you get with serial recovery, you need to do handle the transport in the application, and then you need to store the new image separately from the existing image. One alternative could be to use an external flash in addition to the nRF, and have the secondary slot there.

Einar

[RAM_MS]

Hello Einar ,

Einar Thorsrud said:

Which transport do you use for DFU?

I am using serial.

Einar Thorsrud said:

you need to do handle the transport in the application, and then you need to store the new image separately from the existing image.

I don't want to store new image separately .

Instead I want  overwrite-based image upgrades,

please guide steps to do so.

Thanks ,

Ram

[Einar Thorsrud]

Hi Ram,

In that case, what you want is the serial recovery. That is the only supported option. The nRF Connect Desktop documentation has good documentation about it: Serial recovery DFU.

Einar

[RAM_MS]

Hello Einar ,

Einar Thorsrud said:

In that case, what you want is the serial recovery. That is the only supported option.

overwrite-based image upgrade, can be done only by Serial recovery DFU ?

By using Bluetooth(OTA), It can not be done ?

Thanks,

Ram

[Einar Thorsrud]

That is correct. Bluetooth transport must be done by the application, and the application cannot overwrite itself.