Secured Firmware Only?

RE: Secured Firmware Only?

mansen motors — Thu, 11 Aug 2022 22:05:57 GMT

Hi Swathy,

Thanks for the reply, I was able to read between the lines and came to that conclusion, but thank you for stating it clearly here. I'm sure it will help someone else down the road.

Colin

RE: Secured Firmware Only?

SwRa — Wed, 10 Aug 2022 08:51:06 GMT

Hi Colin,

The flash will be split into secure and non-secure only if the application is built as non-secure(nrf5340dk_nrf5340_cpuapp_ns).. If you build the application as nrf5340dk_nrf5340_cpuapp, then the whole flash is secure..

Best Regards,

Swathy

RE: Secured Firmware Only?

mansen motors — Wed, 20 Jul 2022 17:35:42 GMT

Hi Swathy,

Thank you for the reply!

I understand that the total size depends on what partitions are chosen, I guess my real question wasn't clear enough, so:

Can you specify all the remaining flash (minus bootloader) to be used for a secured partition only. Or, is the secure partition limited to a specific size.

My question comes from a graphic I saw somewhere that I can no longer find which specified the Secure size to be 256kB and the non-secured to be the remaining flash. I'm starting to think this was just an example though.

My concern is over the peripheral access which is not granted in the non-secure partition. But I think it's starting to be clear from your response and my inability to ask the question, that what I found was just an example.

Thanks,

Colin

RE: Secured Firmware Only?

SwRa — Wed, 20 Jul 2022 13:23:08 GMT

Hi Colin,

How much space you have for your application depends. The mcuboot uses around 48kB. So then you have roughly 1mb-48kb left for application. However, if you want dfu updates with two slots, then you have 1mb-48kb/2 left for the application (both applications slots need to have the same size). Also if you want to store stuff in flash, that will occupy space. If immutable bootloader is used, that will also occupy some space.

Regards,

Swathy

RE: Secured Firmware Only?

mansen motors — Tue, 19 Jul 2022 18:46:12 GMT

bump??