Thingy91X nrf5340 flash usage configuration changes

RE: Thingy91X nrf5340 flash usage configuration changes

Menon — Wed, 23 Jul 2025 09:54:18 GMT

hello,

[quote user="sd30"]There is no sysbuild directory in the directories created by the SDK "Create a new application" (blinky & nrf multiple_adv_sets currently trying)[/quote]

You can always create a new file named sysbuild.conf under the application directory. See my screenshot below.

[quote user="sd30"]I read that sysbuild is the default when creating new applications with the current tools. So I should actively select sysbuild when creating new applications in the SDK? [/quote]

For SDK version 2.7.0 and above, you need to use Sysbuild for multi-image builds.

[quote user="sd30"]I have been reading about partition manager, and expect to have to create a static partition layout later, esp. one that uses the external flash for storing DFU images, FS etc - to free up more of the internal flash for executable application code. I understand that some boards don't have external flash so all partitions have to be crammed in internal flash of the SOCs, but when a board does have external flash like the Thingy91x - it would be nice to have the OOTB board configuration make use of that resource. Is there by chance an example that does this?[/quote]

I suggest referring to this guide on configuring the external flash, although it's not specifically for the Thingy91x. Also, take a look at this old DevZone case.

Kind Regards,

Abhijith

RE: Thingy91X nrf5340 flash usage configuration changes

sd30 — Fri, 18 Jul 2025 15:40:34 GMT

Thanks for the fast reply and info especially the link to an example with sysbuild.conf

"which SDK version you are using?" SDK 3.0.2

There is no sysbuild directory in the directories created by the SDK "Create a new application" (blinky & nrf multiple_adv_sets currently trying)

I read that sysbuild is the default when creating new applications with the current tools. So I should actively select sysbuild when creating new applications in the SDK?

I had tried a few early lessons from the devAcadamy ncs checkout but I see now its not till lesson 8 that the sysbuild/ directory is included.

I have been reading about partition manager, and expect to have to create a static partition layout later, esp. one that uses the external flash for storing DFU images, FS etc - to free up more of the internal flash for executable application code. I understand that some boards don't have external flash so all partitions have to be crammed in internal flash of the SOCs, but when a board does have external flash like the Thingy91x - it would be nice to have the OOTB board configuration make use of that resource. Is there by chance an example that does this?

RE: Thingy91X nrf5340 flash usage configuration changes

Menon — Fri, 18 Jul 2025 13:22:20 GMT

Hello,

Could you please share which SDK version you are using? If you are using sysbuild to build the sample application and want to disable MCUboot and recover flash, you can add SB_CONFIG_BOOTLOADER_MCUBOOT=n inside the sysbuild.conf file under the application directory. I believe you can also create a static partition file (pm_static) to define your own flash partition layout. See sysbuild partition manager.

Kind regards,
Abhijith