SJC_DISABLE blocking flashing over SWD

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SJC_DISABLE blocking flashing over SWD

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MulattoKid
Contributor IV

Hi,

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

  1. The debug session I have open over SWD with an MCU-Link connected seems to stop working immediately
  2. 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

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Gavin_Jia
NXP TechSupport
NXP TechSupport

Hi @MulattoKid ,

Please kindly refer to this pic:

Gavin_Jia_0-1733471598614.png

 

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

 

Bests,
Gavin

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Gavin_Jia
NXP TechSupport
NXP TechSupport

Hi @MulattoKid ,

Please kindly refer to this pic:

Gavin_Jia_0-1733471598614.png

 

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

 

Bests,
Gavin

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MulattoKid
Contributor IV

Hi @Gavin_Jia,

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

Kind regards,
Daniel

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Gavin_Jia
NXP TechSupport
NXP TechSupport

Hi @MulattoKid ,

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

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MulattoKid
Contributor IV

Thanks!

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