Registers to distinguish between nRF52840 hardware revisions for APPROTECT mechanism needed

[lanwer]

Hi all, 

I am using the nRF52840 and I came across the nrf52_handle_approtect() func in modules/hal/noridc/nrfx/mdk/system_nrf52.c.

In the nrf52_configuration_249() function implementation I was expecting the to find the register addresses of NRF_FICR->INFO.VARIANT (0x10000104) to distinguish between revisions who support the new mechanism (>= F) and older revisions who don't (<= D). What I found is a register address (0x10000134) that is not present/documented on the datasheet. 

Can you provide me with more input about the registers (0x10000130 and 0x10000134) below?

uint32_t var1 = *(uint32_t *)0x10000130ul;

uint32_t var2 = *(uint32_t *)0x10000134ul;

Looking forward to more information. Thanks! 

Regards

[Einar Thorsrud]

Hi,

These two registers are not publicly documented, but they are used to determine the part number and hardware revision. That is why you will see these used extensively in nrf52_erratas.h to determine if workarounds for specific errata should be applied or not.