Kinetis Microcontrollersのトピック回复： Backdoor key access

Backdoor key access

Sourdev — Mon, 25 Sep 2023 06:38:11 GMT

Hi,

I am using S9KEAZN64AMLC MCU (Custom Board). In FLASH Configuration, I secured Flash and enabled the backdoor key.

Key = 0xBBBBBBBBBBBBBBBB

FLASH configuration = 0xFFBDFFFF.

When Memory is secured, I cannot read data from memory.

If I execute backdoor access key command, the Memory is unsecured and can read data from memory.

After executing the Unlock sequence, after reading memory from JLINK did Power On Reset, Still I am able to read data from memory. Is it correct?

After resetting the device should go again to the Secured state, It should not allow to read memory again, as the FLASH configuration is 0xFFBDFFFF. Please confirm this behavior...

回复： Backdoor key access

ZEROOO — Sat, 07 Oct 2023 06:10:24 GMT

I am also learning the content of the backdoor key, I would like to ask you to execute the backdoor access key command through the external trigger way to achieve?

Re: Backdoor key access

Robin_Shen — Mon, 09 Oct 2023 07:21:16 GMT

Sorry for the late reply.

After executing the Unlock sequence, after reading memory from JLINK did Power On Reset, Still I am able to read data from memory. Is it correct?

What does Unlock sequence mean here?
Have you tried to use latest J-Link Software v7.92h?
Have you tried to use PEMicro or OpenSDA?

Best Regards,
Robin