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Last Post 17 Oct 2022 01:10 PM by  Adam Ford
JTAG
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John Woods
New Member
New Member
Posts:2


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13 Oct 2022 11:54 AM

    I'm trying to disable the JTAG for production units but it is not clear from the TRM how to do this. I've tried disabling via

    CM_CLKEN_PLL(PWRDN_EMU_CORE:12) = 1

    CM_CLKEN_PLL(PWRDN_EMU_PERIPH:31) = 1

    via U-boot but openocd still connects to the SOM/JTAG.

     

    Adam Ford
    Advanced Member
    Advanced Member
    Posts:790


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    17 Oct 2022 01:10 PM
    The DM3730 is very similar to the OMAP35, and this is stating it's not possible to disable the JTAG:

    https://e2e.ti.com/support/processors-group/processors/f/processors-forum/948220/omap3530-jtag-disabled

    I looked at the AM335X which is slightly newer, and it states something similar:
    https://e2e.ti.com/support/processors-group/processors/f/processors-forum/383248/methods-to-disable-jtag-interface-from-software-on-beaglebone-black

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