case about nRF52 and nRF53 recover discrepancy

RE: case about nRF52 and nRF53 recover discrepancy

Hieu — Fri, 16 Aug 2024 14:51:13 GMT

Hi Peter,

Looking at the nrfjprog logs like Hoang said is one way you can see exactly what registers are written.

Otherwise, the documentation I linked previously shows exactly what register operations have to be done to disable read protection. I won't be able to write better than the documentation.

For the purpose of creating a programmer, you might be interested in this application note: nRF5340 Production Programming (nordicsemi.com)

Hieu

RE: case about nRF52 and nRF53 recover discrepancy

Nguyen Hoan Hoang — Fri, 16 Aug 2024 12:12:27 GMT

Add the --log then read the log file. All the steps are in there.

RE: case about nRF52 and nRF53 recover discrepancy

peter.min — Fri, 16 Aug 2024 06:17:33 GMT

Hi Hieu,

The purpose is to make an offline programming tool

1. It is important that nrfjprog --recover will write a firmware to the chip
2. In this written firmware, what key register operations have been done to disable read protection?

Thank you for all your assistance.
Kind regards,
Peter.Min

RE: case about nRF52 and nRF53 recover discrepancy

Hieu — Thu, 15 Aug 2024 10:20:11 GMT

Hi Peter,

Is there any particular reason the customer wants to understand to that level of details?
Also, do you want this to be private, if you are discussing details about your customer?

What the --recover command does is described in the nrfjprog commands documentation:

Erases all user flash memory and disables the readback protection mechanism if enabled.

The nRF5340 Erase All procedure is detailed here: https://docs.nordicsemi.com/bundle/ps_nrf5340/page/ctrl-ap.html#ariaid-title3

Access Port Protection is used to implement readback protection. It is detailed here: https://docs.nordicsemi.com/bundle/ps_nrf5340/page/debugandtrace.html#access_port_protection__tab_app_details_ns

Best regards,

Hieu