nRF54L: Debug port disable process

[JordanYates]

Is there any documentation around the process to disable the Debug Access Port on a nRF54L device in software (not nrfutil)?

The nRF52840 has this nice documentation page, but I haven't found anything similar for the nRF54L: https://docs.nordicsemi.com/bundle/ps_nrf52840/page/dif.html#d402e184

Furthermore, looking at Kconfig options in NCS 3.0.2, it appears the only valid option for nRF54L is `NRF_APROTECT_DISABLE`.

[Menon]

Hello,

Please refer to the section on enabling access port protection and see the config option CONFIG_NRF_APPROTECT_LOCK. By enabling this configuration in prj.conf, I believe the debug access port will be disabled at runtime. However, for permanent protection, this should be combined with a UICR write to the UICR.SECUREAPPROTECT register.

Kind regards,
Abhijith

[JordanYates]

The permanent protection is what I am interested in and the purpose of this question.

The Kconfig configuration does not appear to support the UICR method for nRF54L?
https://github.com/nrfconnect/sdk-zephyr/blob/ddc2615b56a172887c926879987879ee28b61e0b/soc/nordic/Kconfig#L117

https://github.com/nrfconnect/sdk-zephyr/blob/ddc2615b56a172887c926879987879ee28b61e0b/soc/nordic/Kconfig#L160

The following page from your links describes how to lock it using `nrfutil`, but as mentioned in the original question I would like to perform this step in firmware.

https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/security/ap_protect.html#enabling_hardware_ap-protect_by_locking_the_uicrapprotect_register