How to update MCUBOOT

RE: How to update MCUBOOT

Sigurd Hellesvik — Mon, 18 Sep 2023 06:49:14 GMT

[quote user="Mithi"]If i want to use SMP server in my project then how can i pass the image data to the server? Any function or file name?[/quote]

Try to use our DFU Target library

Regards,
Sigurd Hellesvik

RE: How to update MCUBOOT

Mithilesh Yadav — Sun, 17 Sep 2023 15:21:22 GMT

Hi Sigurd,

Due to compatibility issue with flash disk api, I am not able to update bootloader.

I made a separate code without MSD, where I am able to update application and mcuboot.

RE: How to update MCUBOOT

Mithilesh Yadav — Fri, 15 Sep 2023 14:31:20 GMT

If i want to use SMP server in my project then how can i pass the image data to the server? Any function or file name?

I am downloading image from FOTA.

RE: How to update MCUBOOT

Mithilesh Yadav — Fri, 15 Sep 2023 14:19:54 GMT

I can go for the update one after another, by using above code, i am able to update the application, but when I am trying to update MCUBOOT image, named signed_by_mcuboot_and_b0_s1_image_update.bin, after reset the device, it swap the slot 1 and directly jump to slot1 address and then printing "Unable to find bootable image" and device stuck forever.

I am investigating the cause of this.

If i want to use SMP server in my project then how can i pass the image data to the server? Any function or file name?

RE: How to update MCUBOOT

Sigurd Hellesvik — Fri, 15 Sep 2023 13:21:18 GMT

Hi again,

Reading over your question again, you are maybe asking:

"When writing to the secondary slot, how can I make MCUboot realize that this is a new update for NSIB?"

In that case, our build system can automatically generate an image for this, named signed_by_mcuboot_and_b0_s0_image_update.bin, which you can see generated if you build my sample with "west -vvv build ...".

I think that a magic value will be added to the image trailer. Then MCUboot will check this value before swapping, and swap the secondary slot into s0/s1 if it detects a magic number for mcuboot update instead of application image.

RE: How to update MCUBOOT

Sigurd Hellesvik — Fri, 15 Sep 2023 13:06:36 GMT

[quote user=""]But when I am trying to update MCUBOOT by the above same code, MCUBBOT overwrites the application. My assumption was all updates (both application and MCUBBOT) first written to the same mcuboot secondary slot(partitioned in external flash) then copy to mcuboot primary slot/ S1.[/quote]

If you do this using the SMP Server that we got, this is how it works yes. I refer to that, as it is the default that we use.

If you want to write directly to s0 or s1 you can do so, but need to implement this feature yourself.
NSIB does not know how the new MCUboot image got to s0/s1, it just verifies which one is newest and then tries to boot that one.

You can use "#include pm_config.h" to get addresses for the slots.

[quote user=""]Please tell me what is the exact process of updating MCUBOOT and application?[/quote]

Generally I just update one after the other.

Do you want to update both the bootloader and application in one go?

PS: I have an unofficial sample for upgradable bootloaders here.

Regards,
Sigurd Hellesvik