Securing JTAG on i.mx28

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Securing JTAG on i.mx28

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abhijithsoman
Contributor I

I'm using i.mx283 (i.MX283 Processors|High-Performance|NXP )

Couldn't find any documents on how to disable/partially disable JTAG port. 

https://www.nxp.com/docs/en/application-note/AN4686.pdf  Is this application note valid for i.mx28?  

Is it possible to disable JTAG memory access(keeping boundary scan enabled) ?

Is it possible to do this without any manufacturing tools, directly from the Linux running on the processor?

Thanks,

- Abhijith

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abhijithsoman
Contributor I

Hi Igor,

Thank you for the answer.

Could you explain, how can I burn the fuse bit from Linux?

-Abhijith

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igorpadykov
NXP TechSupport
NXP TechSupport

Hi Abhijith

yes this is possible burning bit0 fuse on address  HW_OCOTP_CUSTCAP described in

sect. 20.4.18 Customer Capability Shadow Register (HW_OCOTP_CUSTCAP) i.MX28 Reference Manual

https://www.nxp.com/docs/en/reference-manual/MCIMX28RM.pdf

Best regards
igor
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