SD card adapter for JTAG on Teensy 4.1

[randomfish]

Does anybody know if an SD-card extension / breakout (like the one shown in the post below) would work for hardware debug of the Teensy 4.1 with a J-Link? If so that'd be a viable way to debug without hardware mods, though I haven't seen this approach talked about much, so perhaps it's a non-option.

https://mcuoneclipse.com/2017/04/29...ing/sd-card-adapter-for-jtag-debug-on-teensy/

Thanks.

 

[dresden-fx]

The headline within your linked dicument says: "Modifying the Teensy 3.5 and 3.6 for ARM SWD Debugging" so I guess this will work for those teensies. For Teensy 4.x the JTAG-related pads of the IMXRT are not accessible from any board pins as they are connected to the boot chip. So you will not be able to debug the IMXRT unless you remove the MKL02. BTW the IMXRT is configured for JTAG access, so you had to hook up all those wires, not just the 2 for SWD.