firmware code protect

RE: firmware code protect

Charlie — Wed, 07 Apr 2021 08:53:20 GMT

No, this only enables access to UICR.

nrfjprog tool is the most practical way to configure UICR by far. You can also read and write through NRFX_NVMC driver like nRF52 devices.

RE: firmware code protect

fatalfeel — Wed, 07 Apr 2021 02:52:57 GMT

another question

if I want to setting UICR, does it setting in .overlay

uicr: uicr@ff8000 {
           compatible = "nordic,nrf-uicr";
           reg = < 0xff8000 0x1000 >;
           status = "okay";
       };

RE: firmware code protect

fatalfeel — Wed, 07 Apr 2021 01:50:34 GMT

sorry. its nrf9160dk

RE: firmware code protect

Charlie — Tue, 06 Apr 2021 12:16:36 GMT

Hi Fatalfeel,

1. nRF9160 does not have a USB interface, so you don't need to worry about this. Communication interfaces like uart, SPI, I2C, USB are fully controlled by developers. It is almost impossible to modify them for other purposes from outside unless the developer provides a specific function inside the chip.

2. APPROTECT and ERASEPROTECT in UICR can block all access and the possibility to erase all memory and registers from outside external debuger. You can refer to a similar case from (+) How to fuse nRF9160 debug port? - Nordic Q&A - Nordic DevZone - Nordic DevZone (nordicsemi.com)

Best regards,

Charlie