Disable JTAG on i.MX 7

[falstaff]

Hello,

Is there a way to disable JTAG on i.MX 7 permanently (e.g. using fuses?). The reference manual mentions a SJC Disable Fuse in Chapter 4.12.6.4 "SJC Disable Fuse", as well as Secure JTAG control in chapter 6.4.3.6 "Secure JTAG control". However, Chapter 5 "Fusemap" does not list any of this fuses (i.MX 6 has JTAG_SMODE and SJC_DISABLE listed, both are missing in the i.MX 7 reference manual)...

Best regards,

Stefan
 

[igorpadykov · Accepted solution]

Hi Stefan

Best regards
igor
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[falstaff]

Thanks Igor, that helped!

I used the U-Boot fuse command, where the BOOT_CFG0 fuse is available through Bank 1, Word 3:

fuse prog -y 1 3 0x200000

With that, JTAG is no longer available.