run-time non-volatile overwrite


I'm currently considering Zephyr for some of our future projects, but have a  (hopefully) quick question. We have a requirement that FLASH memory is not erased (including bit-setting on overwrites) and was wondering if anyone can tell me off-the-cuff whether Zephyr requires the ability to re-write non-volatile memory at run-time.
Thanks in advance, Alan. 

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