Hard fault in SPM module

RE: Hard fault in SPM module

MarioDLH — Fri, 13 Aug 2021 14:11:44 GMT

Hi.

It seems that the stack size is what was causing the problem. Now it works perfectly.

Thank you for your assistance.

Best regards.

RE: Hard fault in SPM module

Didrik Rokhaug — Fri, 13 Aug 2021 12:33:08 GMT

[quote user="MarioDLH"]As for the question about what happens on the non-secure side, I don't quite understand what you are referring to. As far as I know, non-secure side waits for the called function to finish before continuing, right?[/quote]

Not necesarily.

E.g. if you have an interrupt happening on the non-secure side, which in turns causes the scheduler to switch to another thread.

See this comment in an earlier ticket for a better explanation.

Another suggestion raised in the same ticket is to increase the stack size of the SPM. You can see how to do that here: https://github.com/nrfconnect/sdk-nrf/commit/2291ddb833869ba15f2705da7e6c13851440ad68

RE: Hard fault in SPM module

MarioDLH — Thu, 12 Aug 2021 16:49:21 GMT

Hi.

Thanks for your response. I tried locking the scheduler but I still get the same error. Debugging the function I managed to find the instruction that leads to the hard fault, but it's a complex macro which won't show while debugging. This is the instruction and it's defined here, if it helps.

As for the question about what happens on the non-secure side, I don't quite understand what you are referring to. As far as I know, non-secure side waits for the called function to finish before continuing, right?

RE: Hard fault in SPM module

Didrik Rokhaug — Thu, 12 Aug 2021 15:32:18 GMT

Sorry for the late reply.

We are a bit short on staff due to summer vacations, so it takes a bit longer to get through everything.

What happens on the non-secure side while during the secure call?

Could you try to lock the scheduler before you switch to the secure domain? See https://github.com/nrfconnect/sdk-nrf/blob/master/subsys/nonsecure/secure_services_ns.c#L14-L24

RE: Hard fault in SPM module

MarioDLH — Thu, 12 Aug 2021 02:17:16 GMT

Hi.

I just want to revive the post, as I still keep facing the same error and I don't know how to proceed.

RE: Hard fault in SPM module

MarioDLH — Tue, 10 Aug 2021 13:42:16 GMT

Hi.

No, UART is not needed. Nevertheless, I tried setting it as secure, but I still get the same error.

RE: Hard fault in SPM module

Didrik Rokhaug — Tue, 10 Aug 2021 11:07:10 GMT

Hi,

Are you using UART or other peripherals in your code?

If so, you must ensure that they are configured as secure. If not, they can only be used by non-secure code.

Best regards,

Didrik