JTAG can't communicate with IMX6UL

[bryant_chou]

Hi Sir:

  I want to use JTAG to communicate with IMX6UL for debug purpose, but now the JTAG can't communicate with IMX6UL.

  I find the signals, TMS, TDI, TCK, NTRST and POR_B, from JTAG are correct, but we can't receive the TDO output from IMX6UL.

    My question is how do i check status about ”JTAG_SMODE[1:0]” and the register 0x460 of Boot Fusemap ??? Are there have any hardware pin can check it???

 The description  about JTAG_SMODE at IMX6ULHDG

    

  The description  about r 0x460 of Boot Fusemap at IMX6ULRM

   

    Thanks and  Regards,

    Bryant Chou

[bryant_chou]

Hi Yuri:

   The IMX6UL can work and bring up.

   Thank for your replay.

   Thanks and  Regards,

    Bryant Chou

[Yuri]

Hello,

  i.MX 6UL devices by default are in JTAG enabled mode. I do not think 

this is root of the issue. Is the i.MX 6UL working? Please verify the scheme,

using the design checklist and  chapter "Avoiding board bring-up problems"

in  the Hardware Development Guide.

http://cache.nxp.com/files/32bit/doc/user_guide/IMX6ULHDG.pdf

  The following may be helpful.

i.MX6UL Hardware design checklist 

Have a great day,
Yuri

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