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.bin file of Secure bootloader is too much

Hi,

I am using nordic52840 development kit board. and I am using sdk17.1 for development.

I tried to create .bin for secure bootloader code inside DFU. but the file size is very large. for my case its around 261MB.

Can any one help me here that why i am getting this much size for binary.

For hex its only 141KB.

Regards

Rohit Saini

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0 Vidar Berg over 3 years ago

Hi Rohit,

Please see my answer in this thread: https://devzone.nordicsemi.com/f/nordic-q-a/47903/noload-directive-for-uicr_bootloader_start_address-and-uicr_mbr_params_page. The large file size is caused by byte padding needed to offset the UICR data that is part of the bootloader image.

Best regards,

Vidar
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0 R_S over 3 years ago in reply to Vidar Berg

So looks like I need to remove the content related to uicr register from hex file and then creating bin file from it.

Now,

So in this case do i also need to program UICR register separately or not....?

And also to creating .bin from .hex which command need will be used....?

Regards

Rohit Saini
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0 Vidar Berg over 3 years ago in reply to R_S
What's the purpose of generating this bin file, is it for DFU or for programming through the debug interface. You will need to write the UICR registers separately if it's for the latter.

R_S said:
And also to creating .bin from .hex which command need will be used....?

I usually use objcopy or hex2bin (link)

example with objcopy:

arm-none-eabi-objcopy --input-target=ihex --output-target=binary <input>.hex <output>.bin

Regards,

Vidar
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0 R_S over 3 years ago in reply to Vidar Berg

bin I am using for Signature creation.

But the size of that bin is very large.

and to run "arm-none-eabi-objcopy" command. which place i need to run this..?

Regards

R_S
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0 Vidar Berg over 3 years ago in reply to R_S

The nrfutil script does this already. I.e. strips away the UICR section from the hex, converts it to a bin, and computes the signature with your private key as input. Is there are reason you can't use nrfutil?

R_S said:
and to run "arm-none-eabi-objcopy" command. which place i need to run this..?

It's from the command line. Objcopy is included in the GNU Arm Embedded Toolchain (link)
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