RAM and Flash start adresses

[Chriis]

Hello,

I was reading this post on the forum: "Adjustment of RAM and Flash memory - Getting Started - nRF5 SDK guides - Nordic DevZone (nordicsemi.com)"

At point 4. "Change start addresses in Segger Embedded Studio" I wondered if you change the start adress of RAM to an adress that is further then the original adress. What happens to the RAM that is not defined?

Does the linker not put code there anymore? If that is true, is there any way you can put your own specific code there?

I want to achieve a data block where I can put specific arrays in and where the linker does not put anything else in.

[Chriis]

Hey Hieu,

There are some algoritms and AI functionality in the library so I am quite sure it needs to be in RAM.

To be sure I have asked Renesas, but for now I will assume that it needs to be in RAM.

[Hieu]

Hi Chriis,

Execute code from RAM can be done. There can be some benefits to performance due to the access speed, but the benefits will be minimal, because the nRF SoCs' caches are pretty good, while the CPU is not fast enough to leverage the advantage of code being on RAM.

Could you please share a link to your conversation with Renasas if it is public? I would like to wait for their answer before we commit to what you are asking for. I just feel that it is not worth it because it's just too much work for too little benefit.

[Chriis]

community.renesas.com/.../105088