topic Re: EvkMIMXrt1064 error when debugging with JLink in i.MX RT Crossover MCUs

EvkMIMXrt1064 error when debugging with JLink

cleo — Fri, 20 Feb 2026 19:47:00 GMT

I am using EvkMIMXrt1064 and MCUXpresso v25.6 and I am trying to debug a demo project using JLink probe. When I launch the debug command I keep getting an error message "

warning: could not convert 'main' from the host encoding (CP1252) to UTF-32.

This normally should not happen, please file a bug report.

monitor exec SetRestartOnClose=1

Program received signal SIGTRAP, Trace/breakpoint trap.

0xdeadbeee in ?? ()"

I have checked previous posts and I so I have cleaned the project, deleted the launch sequence for JLink probe but
nothing helped. I have attached images with the JLink settings and the project screen.
Could you please explain how to get rid of this error ?

Re: EvkMIMXrt1064 error when debugging with JLink

EdwinHz — Mon, 23 Feb 2026 19:27:28 GMT

Hi @cleo,

Could you please help me clarify the following points:

Does this also happen with the onboard debugger? What SDK version are you using? Have you done any modifications to the demo application that you are trying to program via J-Link? What demo is it?

Finally, the "warning: could not convert 'main' from the host encoding" is most likely not the actual error, but rather a warning message thrown by the debug console that is only a symptom of another underlying issue. Could you share the whole output or log of the Debugger Console?

BR,
Edwin.

Re: EvkMIMXrt1064 error when debugging with JLink

cleo — Mon, 23 Feb 2026 22:13:03 GMT

Hi @EdwinHz ,

I am using evkmimxrt1064_iled_blinky demo project and I can debug it using the DAP Link debugger, the onboard debugger. I am using SDK version 25.03.00 and MCUXpresso IDE version 25.6. I haven't done any modification to the demo application, I just switched from debugging with DAP Link to debugging using J-Link. The J-Link probe is connected through SWD and I removed the jumpers J47 and J48. I have tried to debug using J-Link when the board was set to boot in Internal Mode and also in Serial Download Mode. In both cases I get the same error message.
"

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warning: could not convert 'main' from the host encoding (CP1252) to UTF-32.
This normally should not happen, please file a bug report.
monitor exec SetRestartOnClose=1

Program received signal SIGTRAP, Trace/breakpoint trap.
0xdeadbeee in ?? ()"

Re: EvkMIMXrt1064 error when debugging with JLink

EdwinHz — Tue, 24 Feb 2026 20:09:00 GMT

Hi @cleo,

Please try doing the following procedure:

Power off the board
Configure SW7: 1-OFF, 2-OFF, 3-OFF, 4-ON
Disconnect J45, J46, J47, J48, J49, J50
Connect your external JLINK to J21 JTAG interface.
Open the JLINK commander
Try to connect and do a mass erase via JLINK commander.

Let me know if you encounter any issues during this procedure.

BR,
Edwin.