NCS 2.7.0
nrf52840
I'm currently porting software that was originally developed for nrf52832 on NRF5 SDK to run on Zephyr. I am currently on a deadline to delivery a prototype of the manufacturing test firmware to the factory for first PCB validation. This release will be single image and then I will begin work to implement the bootloader which of course will mean multi-image build.
One of the tests utilized a noinit region to confirm that power to the nrf processor was cut between phases of the test. The implementation of noinit data was fairly straight forward on nrf5 sdk. A section was defined in the flash_placement.xml. This section also had to be coordinated with the bootloader so it wasn't overwritten.
I'm trying to understand the process with zephyr. I will make some statements of my understanding from reading portions of the documentation. Please correct anything I get wrong. I also have some questions inline which I will number and bold.
It seems like it may vary depending on whether it is single image or multi-image. For multi-image it appears the partition manager comes into play. I'm unclear on how it works for single image.
A note I found on the partition manager page ( Partition Manager )
When you build a multi-image application using the Partition Manager, the devicetree source flash partitions are ignored.
Would imply that single image builds take partition definitions from devicetree.
Alternatively, it seems I can use partition manage with a single image by including the Kconfig variable CONFIG_PM_SINGLE_IMAGE in my prj.conf.
It also appears with partition manager there is a mechanism for a subsystem to provide a supplemental configuration, however I only find subsys/partition_manager within the nrf module.
1) Out of general curiosity, Is partition_manager a proprietary element of NCS that is not included with Zephyr itself?
2) Can I add a subsystem pm.yml from my out-of-tree customer/application repository?
3) Is partition_manager the recommended way to add a noinit section? Are there any samples that would demonstrate how it should be implemented?
4) Since my project will ultimately be multi-image with a bootloader, is my best choice to develop with partition_manager?
5) Any change with partition_manager in NCS 2.8.0 or planned for the future?
a*
