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

[William WT Lin]

Hi,

I'm currently using the nrf52840 SDK board and based on ncs 2.9.0 SDK. I need to make a simple sample customer bootloader that does not use the DFU and MCUBOOT functions. This function requires listening to button 1 & button 2 interrupt in the bootloader to jump to the specified flash location to execute the application (bt1 clicked -> app1, bt2 clicked -> app2). Can you provide me with a similar example for reference?

1. How to make the Bootloader jump to the specified flash address?

2. How to specify the application project to burn to a specific flash address in VS code?

3. How to combine bootloader+app1+app2 into one binary file?

[Amanda Hsieh]

Hi, 

Can you provide me with a similar example for reference?

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

1. How to make the Bootloader jump to the specified flash address?

Check out do_boot()

2. How to specify the application project to burn to a specific flash address in VS code?

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

3. How to combine bootloader+app1+app2 into one binary file?

You can use Sysbuild or merge files with mergehex.

Regards,
Amanda H.