RE: Secure DFU, Should you use fstorage or nrf_dfu_flash

emdi — Fri, 28 Jul 2017 11:50:05 GMT

Hi,

That configuration instructs the bootloader to not erase some flash pages which are used by the Peer Manager to store bond information. Thus, the application can retain bond data after a DFU. If you write to that area using fstorage you might end up corrupting the fds data.

In short:

If you don't use Peer Manager, you can use that area as you wish.
If use Peer Manager, increase DFU_APP_DATA_RESERVED to include more one flash page and write your data there.

RE: Secure DFU, Should you use fstorage or nrf_dfu_flash

bjorn-spockeli — Wed, 26 Jul 2017 14:03:12 GMT

If its just a serial number that is written to flash in the application then I would use fstorage as it has a smaller footprint than nrf_dfu_flash that wraps aroung fstorage.