PM Partitions and external flash

[AndyM]

Hello

I have a custom nrf52840 board with an external 1MB NOR flash

The app uses MCUboot for DFU

I know I can define the external flash in the pm_static.yml for the main app

i.e 

external_flash:
address: <set address here>
region: external_flash
size: <set size here>

I would like to use the internal flash for slot0 image and external flash for slot1 image for DFU

How can I define my external flash to be the 

slot1_partition where the DFU image will be loaded?
Thanks

[Amanda Hsieh]

Hi Andy, 

There is an MCUboot with external flash test in the nRF Connect SDK, which can be used as a reference. For NCS v2.9.0, you can enable SB_CONFIG_PM_EXTERNAL_FLASH_MCUBOOT_SECONDARY to place the secondary MCUboot update partition in external flash. Also, see the External flash memory partitions. 

Regards,
Amanda H.

[AndyM]

Thanks, I'll give it a try as soon as I get the hardware.