S32K中的主题 Re: Backdoor problem

Backdoor problem

lyz — Tue, 08 Nov 2022 09:54:14 GMT

Problem1:

I use this example code, disable successfully, but the S32K144 chip reset when i use J-Link to connecting S32K144 core by J-Flash. example as follow:

Can i use J-Link to connecting S32K144 core by J-Flash when Using a backdoor key to unlock security? Can the chip reset?

Problem2:

when Using a backdoor key to unlock security, as follow, manual config

but, the config of example code, as follow:

Both is different. I try the config of manual, do not disable secure.

please tell me the answer, thanks!

Re: Backdoor problem

Robin_Shen — Wed, 09 Nov 2022 09:34:34 GMT

Hi lyz,

A1. When test that example, the chip is secured after reset.(notice "Un-securing the MCU using backdoor key access") When you want to connect it, mass erase will blank the chip, no code in the chip will cause periodic resets.

A2. FTFC->FCCOB[3] point to FCCOB0 which used to fill with Flash command(You can refer to the source code of AN5401SW\3_Basic_operations)

Best Regards,
Robin
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Re: Backdoor problem

lyz — Thu, 10 Nov 2022 02:59:06 GMT

thank you very much!
I know this. But forget FTFC->FCCOB[3] point to FCCOB0