ncs SDK 2.9.x create customer bootloader to switching two bank applications

RE: ncs SDK 2.9.x create customer bootloader to switching two bank applications

Robotics Gun — Tue, 08 Jul 2025 15:22:15 GMT

I opened a ticket. Please check below. ^^

devzone.nordicsemi.com/.../nrf52832-ncs-sample-instruction-for-custom-bootloader

RE: ncs SDK 2.9.x create customer bootloader to switching two bank applications

Amanda Hsieh — Tue, 08 Jul 2025 14:27:11 GMT

Please create a new support case for your issue.

RE: ncs SDK 2.9.x create customer bootloader to switching two bank applications

Robotics Gun — Tue, 08 Jul 2025 00:41:24 GMT

SinceI also have the same questions for our custom board, I ask here.

Amanda Hsieh

In our custom board, the bootloader which executed as soon as the system boot up should give high on a specific gpio.

How do I achieve it?

Any guidance?

I have no idea how to do this.

RE: ncs SDK 2.9.x create customer bootloader to switching two bank applications

Amanda Hsieh — Fri, 23 May 2025 14:58:53 GMT

You can use a static partition (pm_static.yml) or set CONFIG_FLASH_LOAD_OFFSET in prj.conf to your desired address.

Since I will start vacation next week, I will not reply to this case during the period. If you need urgent support, please create a new support case.

RE: ncs SDK 2.9.x create customer bootloader to switching two bank applications

William WT Lin — Fri, 23 May 2025 09:03:21 GMT

Hi Amanda,

I have completed the "lesson-8-sysbuild" course, but I still don't know how to burn another application project to a specific flash address. Where should I set the specific flash address?

Best Regards,
William Lin

RE: ncs SDK 2.9.x create customer bootloader to switching two bank applications

William WT Lin — Wed, 21 May 2025 01:38:23 GMT

Hi Amanda,

Thank you for your reply, I will read the documents and ask if I have any questions.

Best Regards,
William Lin

RE: ncs SDK 2.9.x create customer bootloader to switching two bank applications

Amanda Hsieh — Tue, 20 May 2025 14:55:01 GMT

Hi,

[quote user=""]Can you provide me with a similar example for reference?[/quote]

Unfortunately, there is no such example as your requirement. You could develop a custom bootloader to achieve that.

[quote user=""]1. How to make the Bootloader jump to the specified flash address?[/quote]

Check out do_boot()

[quote user=""]2. How to specify the application project to burn to a specific flash address in VS code?[/quote]

See https://academy.nordicsemi.com/courses/nrf-connect-sdk-intermediate/lessons/lesson-8-sysbuild/

[quote user=""]3. How to combine bootloader+app1+app2 into one binary file?[/quote]

You can use Sysbuild or merge files with mergehex.

Regards,
Amanda H.