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Split firmware files

Hi,
I wrote an application in a 8051 device containing several modules.
One of them needs some certification and after that it can no longer be modified.
To ensure this a CRC is computed on the firmware file.

The problem is that after certificates the other modules need to be modified and this will affect the firmware CRC even if I didn't modify the certified module.

The solution would be to somehow isolate the certified module in a separate firmware file and the just load both files into the device.

Is there any way to do this?

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