Differences eraseall and recover

[Eugene Yu]

Hello Team,

I am wondering if the nrfjprog can erase all the flash and UICR by --recover option.

For this question, I just read the below links but, I couldn't get the conclusion still.

 nrfjprog clarification --eraseall vs --chiperase vs --recover 

 RE: Difference between nrfjprog --recover and nrfjprog --eraseall 

If I execute "--eraseall" and "--recover" separately for nRF5340, it has a different result on the Programmer app as in the below pictures.

Could we confirm to the customer "--revocer" option erases all the flash and UICR as "--eraseall" even if it has a different memory map result?

< --recover >

 

< --eraseall for application core > 

There is one more question.

If the customer uses the command below, will this be verified for both application and network core?

It seems to verify only the application core.

nrfjprog -f NRF53 --coprocessor CP_NETWORK --recover

nrfjprog -f NRF53 --coprocessor CP_APPLICATION --recover --program merged_domains.hex --verify --log test.log

Thanks,

Eugene

[Vidar Berg]

Hello Eugene,

The nrfjprog --recover command will first perform an 'Erase all ' operation through the CTRL-AP before it writes 0x50FA50FA to UICR.APPROTECT to disable APPROTECT in hardware. Then, it loads a small firmware that will disable APPROTECT in software.

https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/device_guides/working_with_nrf/nrf53/nrf5340.html#readback-protection

It seems to verify only the application core.

It's verifying both cores when I test it here.

Best regards,

Vidar

[Eugene Yu]

Hi Vidar,

Thanks for your clear and prompt answer.

Thanks,

Eugene