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Zephyr Application + System Part

I don't think this is possible at the moment but worth putting it out in the wild: 

Currently the binary image sizes for nRF9160 using Zephyr can get quite hefty. Is there a way to create a system library image and separate application code image? That way if an application needs an update, it's only necessary to update the application image. (Similar concept to how the original Nordic SDK works with the Softdevice + Application Code.)

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