NRF7002DK BLE + WIFI ROM SIZE ISSUE (RECOVERY)

[heavyjo]

we have two questions about dfu recover operation on coex_ble&wifi example.
because its flash size is so big that it could not be reduced under 500kB.

so, we thought that it would be broken when it failed with dfu. 

1. could i reduced flash size (ble + wifi) under 450kB?

2. is there any way that make dfu success when flash size is over 1/2 * whole app size.

[AHaug]

Hi,

I highly doubt that you will be able to do that, but you can do some experimentation and see if this is possible by following the guide for General recommendations, BLE and Wifi found here: https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/test_and_optimize/optimizing/index.html 

You can also consider the use case for the Wifi part of the application w.r.t what features you need and how large you need to set certain stacks etc to make sure that you still pass qualification. For this you can use this page to consult for various typical usage profiles: https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/protocols/wifi/stack_configuration.html#usage_profiles 

You might also find some useful suggestions here:  Debunking misconceptions: A technical analysis of nRF5 SDK and nRF Connect SDK 

2. is there any way that make dfu success when flash size is over 1/2 * whole app size.

No, not without an external flash or completely dropping MCUboot dual bank DFU and only using serial recovery (which requires physical DFU) and dropping on the DFU safetymechanisms that dual bank gives you

Kind regards,
Andreas

[heavyjo]

We have already adjusted the options, but we couldn't reduce the size to the desired level.
Is it possible to update the SDK separately like nrf5sdk option?

[AHaug]

heavyjo said:

We have already adjusted the options, but we couldn't reduce the size to the desired level.

Noted.

heavyjo said:

Is it possible to update the SDK separately like nrf5sdk option?

Could you clarify what you mean by "updating the SDK separately"? It's a bit unclear what you mean with updating the SDK when you're trying to update the firmware on the 

Do you refer to updating the Softdevice part of the nrf5 application, and then update the rest of the application, which you could do in nRF5 SDK since the SoftDevice were separated from the application? If this is the case, then the answer is unfortunately no

Kind regards,
Andreas