Primitive Dual Booting a nRF21540 (nRF52840) and zephyr Nordic Bluetooth examples

RE: Primitive Dual Booting a nRF21540 (nRF52840) and zephyr Nordic Bluetooth examples

Håkon Alseth — Mon, 17 Mar 2025 14:26:14 GMT

Hi,

Always happy to help out. There's effectively a function pointer and setting the MSP.

[quote user="AMarch01"]Thanks for the reply, I always appreciate Nordic's help. You guys are supporting a large amount of code. I know I was wide eyed while asking about Matter application code. Your team was very helpful then.[/quote]

We're here to help out with anything you might have questions or issues related to. I'll relay your gratitude to the Matter team

Kind regards,

Håkon

RE: Primitive Dual Booting a nRF21540 (nRF52840) and zephyr Nordic Bluetooth examples

AMarch01 — Mon, 17 Mar 2025 13:37:31 GMT

The mcuboot module would be a good option, but my launch code was so much easier to control in terms of additional code and knowledge. I just wanted to make sure there wasn't more to the programs I am jumping to.

The end product is sort of special case device.

Thanks for the reply, I always appreciate Nordic's help. You guys are supporting a large amount of code. I know I was wide eyed while asking about Matter application code. Your team was very helpful then.

RE: Primitive Dual Booting a nRF21540 (nRF52840) and zephyr Nordic Bluetooth examples

Håkon Alseth — Mon, 17 Mar 2025 13:25:37 GMT

Hi,

[quote user=""]To simplify, the question is: " Are there any specific assumptions (that I can know about of course) being made about the state of the processor when a Nordic Bluetooth Program starts from reset? Can I just relocate them and jump to them?"[/quote]

As you mention, you should set the SP and entry-point. Other than that, it is to cleanup any specific peripherals that you may have used (uart for instance).

It sounds like you want to boot different applications. Have you considered using mcuboot?

Kind regards,

Håkon