how can we disable debug port for nrf5340?

[Jaewook]

Dear Nordic team,

For the security reason to be safe from the hacking, we like to completely disable the debugging and flashing port during production.  

Would you please provide a manufacturing guideline document or any material if available?

Regards,

Jae

[Jaewook]

By using your manufacturing guideline document, we need to explain it in order to get security approval.

[Vidar Berg]

Dear Jae,

I have included links to some relevant resources below.

- nAN42 - nRF5340 Production Programming - app note mostly intended for developers of flash programming tools. 

- Debug and trace - chapter from the PS with a functional description of the protection mechanisms

- Kconfig symbols for controlling APPROTECT status in SW

In short, what you need to do is to make sure the UICR.APPROTECT register for the app core and the net core does not get programmed with the 0x50FA50FA "unlock" value (they should ideally be set to 0x00000000), and also that CONFIG_NRF_APPROTECT_LOCK is enabled in your app and net core project.

Best regards,

Vidar