I.MX8M Plus Enter JTAG Debug

[hjc]

When using NXP I.MX8M Plus chip for bare metal development and debugging, and using DStream emulator to connect to the JTAG interface of I.MX8M Plus processor through JTAG, pin JTAG_ MOD has been set to low level, but the development board cannot enter the JATG debugging mode, and the ROM Table of the chip cannot be read using the J-Link emulator. Does the I.MX8M Plus chip disable the JTAG function when it leaves the factory? How can I enable the Cortex-A53 processor in I.MX8M Plus chip to enter the bare metal debugging mode through JTAG? Thank you

[Bio_TICFSL]

Hello,

Yes, JTAG is disable when is leaving the factory, but this is just for rom access you can access to the rest of the code.

Regards

[hjc]

if i no use rom access, how can i do that use the jtag for debug Cortex-a53 bare metal program ?

how can i do that enter jtag debug mode, thank you

[NXP_USER_05]

Hi,

I have some questions regarding JTAG connectivity and boot options for a custom i.MX8M Plus board.

1. How do you typically connect your board for debugging — using JTAG or another interface?

   • If JTAG is used, do you connect after U-Boot has executed or before boot (at power-on reset)?

2. In our custom board, USB and SD interfaces are not populated, so we currently have only JTAG available for communication and detection.

   • Could you please advise on the correct procedure or configuration to bring up the board only via JTAG (  DSTREAM-ST)?

   • Is there any additional configuration needed in the  JTAG_MOD / Boot Mode pins for enabling debug access when no boot device is present?