Generating binaries on vscode with prepended zeroed header to the image

[Ubaid_M]

Hello ,

I am using nrf Connect SDK v1.9.1 with nRF Connect extension for my application development.

With reference to the nordic documentation : https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/mcuboot/imgtool.html#incorporating-the-public-key-into-the-code:~:text=Zephyr%20build%20system%20will%20already%20prepended%20a%20zeroed%20header%20to%20the%20image

Please find as in below snap the binaries generated from vscode and nCS I am using, There is no padded zeroed header to my build binaries at 0x000000 (Right image below)

While the left image below is the binary i generated with just zephyr and no nCS. It clearly has zero padded header.

So my question is, How can I have zero padded header to binaries generated out of nCS..?
Can i use any config..?

Thanks,

Ubaid

[Sigurd Hellesvik]

Hi Ubaid,

I will look into this and return with more information tomorrow.

Regards,
Sigurd Hellesvik

[Ubaid_M]

Sigurd Hellesvik said:

I will look into this and return with more information tomorrow.

Yes please, 

Thanks

[Ubaid_M]

Hello Sigurd Hellesvik,

Can you please suggest on use of CONFIG_FLASH_LOAD_OFFSET

[Sigurd Hellesvik]

I suggest that you try to build for different numbers of CONFIG_FLASH_LOAD_OFFSET.
Then you can compare output binaries to test if this is the configuration you were looking for.

Regards,
Sigurd Hellesvik

[Ubaid_M]

Hello Sigurd,

I tried all possible combinations and yet as you can see couldn't achieve a binary with 0x00 to 0x200 prepended with zeros and 0x200 onwards having image data.

Please suggest how do I achieve this..?

[Ubaid_M]

Ubaid_M said:

Please suggest how do I achieve this..?

[Sigurd Hellesvik]

In that case, it does not look like CONFIG_FLASH_LOAD_OFFSET is what you need.

I think I may need some more information to find another solution here.

What is your end goal?

What is the point of padding the start of the binary?

Regards,
Sigurd Hellesvik

[Ubaid_M]

Sigurd Hellesvik said:

What is the point of padding the start of the binary?

I have a custom binary signing server, to pass the binaries to the server, I need my binaries to be prepended with zero header.

As it will mark the header.

[Sigurd Hellesvik]

I got an idea:

The "-vvv" option to west will make it more verbose, making the build print the command used for creating the binaries.

Can you build both for Zephyr and for the nRF Connect SDK with this?

west -vvv build -p -b <board_name>

Then post the build log for both here using "Insert->Code".

This way, we can compare the generations of the different binaries to try and find the  difference.

Regards,
Sigurd Hellesvik

[Ubaid_M]

Hi ,

Found no way finally
Manually editing the binaries.
So marking this as closed.

app_update_DFU_v3.bin