52840DK FW size confusing

[susepc]

Dear all:

        I found that the nrf52840 flash size is only 1MB, but the size of light bulb load is about 850KB, I have some questions:

        1. Does it contains the FOTA region? If yes, what is the size of the FOTA region?

        2. If binary doesn't include FOTA region, 1MB flash in nrf52840 seems not enough to do FOTA, how to implement FOTA？

BR

Chuan

        

[AHaug]

Hi,

I assume you are referring to the Matter Light bulb sample. Is this the case?

If so, yes, the sample without optimization is this large. You can see some memory footprints here: https://docs.nordicsemi.com/bundle/ncs-2.8.0-preview1/page/nrf/protocols/matter/getting_started/hw_requirements.html. For Light Bulb in release configuration it is 755kB.

      1. Does it contains the FOTA region? If yes, what is the size of the FOTA region?

No, this is not included the FOTA region.

2. If binary doesn't include FOTA region, 1MB flash in nrf52840 seems not enough to do FOTA, how to implement FOTA？

For DFU in Matter devices, an external memory flash device is required.

Kind regards,
Andreas

[susepc]

AHaug 

        Got it, thx a lot!