topic 回复： SJC_DISABLE blocking flashing over SWD in i.MX Processors

SJC_DISABLE blocking flashing over SWD

dafela — Thu, 05 Dec 2024 07:58:55 GMT

Hi,

When blowing the SJC_FUSE on an i.MX RT1060 two things seems to happen:

The debug session I have open over SWD with an MCU-Link connected seems to stop working immediately
I'm unable to start new debug sessions or perform other actions towards the MCU using the MCU-LINK and SWD

While this is OK, I'm wondering if disabling the JTAG interface on the MCU also disables any SWD interactions?

Thanks,
Daniel

Gavin_Jia — Fri, 06 Dec 2024 07:55:16 GMT

Please kindly refer to this pic：

SJC_DISABLE negates both lines, so both are blocked. Either JTAG/SWD or even test control.

Bests,
Gavin

dafela — Fri, 06 Dec 2024 08:09:57 GMT

Thanks for confirming!
Out of curiosity, where is this picture from?

Kind regards,
Daniel

Gavin_Jia — Fri, 06 Dec 2024 08:27:01 GMT

It is from AN12419: Secure JTAG for i.MXRT10xx.

ANs related to security features now require an NDA and a permission request to access them.

Best regards,
Gavin

dafela — Fri, 06 Dec 2024 08:31:05 GMT

Thanks!