How to set a function run in ram in NCS 2.8

[stevenX]

HI,

I have a function testfun from a customer-provided .a library, and I hope to run this testfun function in RAM. I am currently using NCS 2.8 based on the nRF52840. I’ve looked up some information but encountered a few issues:

1. After building the program, what is the name of the NCS linker script? Where is it located? I couldn’t find it.
2. If I can't directly modify the .a file, how should the program be configured so that testfun runs in RAM?

Please provide some help, thank you.

[Vidar Berg]

Hi,

The code_relocation_nocopy sample at https://github.com/nrfconnect/sdk-zephyr/tree/main/samples/application_development/code_relocation_nocopy  demonstrates how you can create custom linker sections to relocate your code. This example is specifically made to demonstrate how you can relocate code to ext. flash but it can also be modified to relocate code to ram. I'm not sure if you will be able to relocate a single function from the library, or if you have to copy the entire library to RAM. Is the goal to improve the execution speed? In that case, you need to use the CODE RAM.

Best regards,

Vidar