S32K中的主题 How can I use the Backdoor Comparison Key without Flash commands

How can I use the Backdoor Comparison Key without Flash commands

香龙朱 — Tue, 23 Oct 2018 02:49:12 GMT

Hi, all

In S32K-RM.pdf, I know how to use the backdoor key to unsecure the chip. But if the chip is secured and there's no porgram in it. How can I unsecure it with backdoor key? Is there any tools or applications?

anyone can tell me?

Thanks!

Re: How can I use the Backdoor Comparison Key without Flash commands

danielmartynek — Tue, 23 Oct 2018 10:45:07 GMT

Hi,

There is an example that shows use of the feature.

https://community.nxp.com/docs/DOC-335429

Unfortunately, the backdoor key can be used to unlock the MCU by the FTFC command only.

If you want to unlock the MCU from outside, you need to mass erase the whole chip.

Regards,

Daniel

Re: How can I use the Backdoor Comparison Key without Flash commands

paul_lalthuamsa — Fri, 11 Jan 2019 12:52:52 GMT

Hi Daniel,

I am using chip FS32K144HAMLL which is expected to have CSE, but i am facing of issue of Hardfault on access to PRAM.(attached pic, it stuck on PRAM)

Debugger used: segger j-link base.

Example program tried: 1_configure_part_load_keys project from AN5401SW.

I have check this same project on S32K144EVB (with on board PE debugger) which has chip label PS32K144UAVLLA, it works.

Waiting for your comment!!

The chip what i used on my board seen to have CSE

Re: How can I use the Backdoor Comparison Key without Flash commands

ummerkunnummalk — Thu, 23 May 2019 15:38:45 GMT

Hi paullalthuamsanga,

Please check the PRAM base address in S32K144.h. It should be #define CSE_PRAM_BASE (0x14000800u).