i.MX Processors中的主题 Re: Disabling JTAG on IMX7d

Disabling JTAG on IMX7d

stephendonn — Wed, 31 Oct 2018 15:52:42 GMT

I'm trying to disable JTAG on an IMX7d. IMX7DSSRM refers to eFuse SJC_DISABLE, but I can't seem to find which OCOTP fuse this is. Is there release note or some such similar to AN4686 for the IMX7d?

Kind regards

Steve

Re: Disabling JTAG on IMX7d

igorpadykov — Thu, 01 Nov 2018 04:03:53 GMT

Hi Steve

this fuse is described in sect.6.3.1 Boot Fusemap i.MX7D Reference Manual

http://cache.nxp.com/files/32bit/doc/ref_manual/IMX7DRM.pdf

Fuse programming:

https://community.nxp.com/docs/DOC-95458

Best regards
igor
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Re: Disabling JTAG on IMX7d

VladanJovanovic — Thu, 01 Nov 2018 05:00:22 GMT

Table 6-19 in ref. manual shows that it is bit 21 at 0x470 fuse address. Looking at OCOTP chapter, that would be OTP Bank 1, Word 3 (OCOTP_BOOT_CFG0).

Re: Disabling JTAG on IMX7d

stephendonn — Thu, 01 Nov 2018 09:36:48 GMT

Thank you for the information.