How to disable JTAG on imx8mq

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How to disable JTAG on imx8mq

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nilesh_patel
Contributor II

Hi,

We need to disable JTAG.

How can we disable JTAG in Linux firmware.?

Thanks,

Nilesh Patel

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nxf46838
NXP TechSupport
NXP TechSupport

Hello,

 

You may use SJC Disable Fuse for this purpose, please find more information about this fuse in the i.MX 8M reference manual chapter 4.13.5.4 SJC Disable Fuse, you may also find more information about this fuse in our Security Reference Manual.

 

As for the blow fuses procedure you may do this in uboot by using the fuse command:

 

=> fuse

fuse - Fuse sub-system

Usage:

fuse read <bank> <word> [<cnt>] - read 1 or 'cnt' fuse words,

    starting at 'word'

fuse sense <bank> <word> [<cnt>] - sense 1 or 'cnt' fuse words,

    starting at 'word'

fuse prog [-y] <bank> <word> <hexval> [<hexval>...] - program 1 or

    several fuse words, starting at 'word' (PERMANENT)

fuse override <bank> <word> <hexval> [<hexval>...] - override 1 or several fuse words, starting at 'word'

 

Also, it may be useful to take a look to this thread for more option for blow fuses:
https://community.nxp.com/thread/480188?commentID=1161432&et=watches.email.thread#comment

 

Hope this helps,

Best regards,

Aldo.

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