About creating a custom bootloader

[kullin]

As requested by a customer, I am trying to create a custom bootloader that branches into three applications depending on data from I2C.

I am using nRF Connect SDK V2.5.0
I thought about creating it based on "nRF Secure Immutable Bootloader" from \ncs\v2.5.0\nrf\samples\bootloader.
I was able to successfully create the parts that jump to the three applications.

However, within this "nRF Secure Immutable Bootloader" project,
zephyr's k_timer API is not working properly.
Additionally, Thread APIs such as k_msleep cannot be linked correctly, resulting in an error, making time management impossible.

How should I manage my time?

Also, to create a custom bootloader like this
Is there a project that would be a better example?

[Kenneth]

Hello,

To reduce size of the bootloader the multithreading is disabled, as described here:
https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/zephyr/kernel/services/threads/nothread.html 

You can find https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/kconfig/index.html#CONFIG_MULTITHREADING is set to n in prj.conf.

Kenneth

[kullin]

Thank you for your reply.

I can now link it properly and run it, but
I couldn't get it to run at the right time.

Is there any possible cause?