Header size for imgtool sign in the documentation is set to 0x20000

[schnoberts1]

Hi,

This seems quite large and also outside the range of the pack format in image.py. Result:

    self.add_header(enckey, protected_tlv_size)
  File "/home/andy/code/dbc/test/tools/provisioning/.venv/lib/python3.12/site-packages/imgtool/image.py", line 573, in add_header
    header = struct.pack(fmt,
             ^^^^^^^^^^^^^^^^
struct.error: 'H' format requires 0 <= number <= 65535

Using 0x2000 (assuming the doc had an extra zero) doesn't result in an error. I've not tested the upload yet.

Documentation: https://github.com/arduino/mcuboot-arduino-stm32h7?tab=readme-ov-file#manually-create-a-signed-and-encrypted-update-sketch

I am using the imagetool installed via pip. However. I note the same H format on the mcuboot scripts version.

[schnoberts1]

So it turns out that the imgtool shipped with Arduino is different from the standard one. The Arduino one accepts the large header value. Whether this is right, I don't know. Certainly the resulting image won't upload to my Giga. Probably error between chair and keyboard so I'll close this particular ticket though I would ask that your documentation specifies what tooling to be used, imgtool and dfu-util are pretty standard tools.

[pennam]

@schnoberts1 this is not a typo, we had to do this to keep the arduino sketch start address to 0x08040000 and the start of the header aligned to the flash sector @ 0x08020000

[schnoberts1]

Can I grab the custom imgtool from a repo?

[pennam]

Can I grab the custom imgtool from a repo?

https://github.com/arduino/mcuboot/tree/stm32h7-1.8.0/scripts

[schnoberts1]

Awesome, thnx. On 24 Mar 2025, at 16:01, Mattia Pennasilico ***@***.***> wrote: Can I grab the custom imgtool from a repo? https://github.com/arduino/mcuboot/tree/stm32h7-1.8.0/scripts—Reply to this email directly, view it on GitHub, or unsubscribe.You are receiving this because you were mentioned.Message ID: ***@***.***> pennam left a comment (arduino/mcuboot-arduino-stm32h7#38) Can I grab the custom imgtool from a repo? https://github.com/arduino/mcuboot/tree/stm32h7-1.8.0/scripts —Reply to this email directly, view it on GitHub, or unsubscribe.You are receiving this because you were mentioned.Message ID: ***@***.***>