Issue using custom SPM in application

[MarioDLH]

Hi.

I'm facing an issue following this guide (https://devzone.nordicsemi.com/nordic/nrf-connect-sdk-guides/b/software/posts/using-a-custom-secure-partition-manager-wtih-your-application?CommentSortBy=CreatedDate&CommentSortOrder=Descending), as I've found out I cannot pass arguments to the secure function when I got this error while building: 'cmse_nonsecure_entry' attribute not available to functions with arguments passed on the stack.
Is there any way to use variables located in the non-secure side of the application in the secure side? I couldn't find any guide or method to do it.

Thanks.

EDIT: I don't know what I changed exactly, but now it seems I'm able to pass arguments to the function, as well as return values. I got a new problem when using spm_request_random_number function in the main.c file of the spm module, saying it's undefined (undefined reference to `spm_request_random_number').

Any idea to solve it?

Thanks.

[Heidi]

Hi!

As I said in my comment to you on the blog post, there is no way to use variables located in the non-secure side from the secure-side. 

You will have to define the variables in the secure side and create a non-secure callable function to be able to read the variables from the non-secure region.

[MarioDLH]

Hi.

I just edited the message because I think I figured it out, but I got that new problem.

Thanks for your answer and support with that though.

[MarioDLH]

If it wasn't possible to use that function, is there another way to obtain a random number in the SPM module using a different function?

Thanks.

[MarioDLH]

Hi.

I finally solved it by using spm_request_random_number_nse instead of spm_request_random_number.