nrf9160 protected code

[ephraim]

Dear Sir.

In my program 2 strings I need to protect when a new firmware is updated.

#define PROD_DATE "PROD_DATE_03_12-2020"
#define IRON_NUMBER "IRON_1234567899999"

How can I achieve this goal ?.

Please Advise.

[Einar Thorsrud]

Hi,

The typical location for such information (serial number etc) is in the section of the UICR that are reserved for customer usage. This is a persistent flash register that is typically never modified after production. You may want to skip the prefixes ("PROD_DATE_" and "IRON_") that I assume is common for all and thus contain no information in order to use less of the UICR for this.