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TM4C123GH6PM: Can I use the ICDI interface from a EK-LM4F120XL Launchpad with this microcontroller?

Part Number: TM4C123GH6PM
Other Parts Discussed in Thread: UNIFLASH, SEGGER

I have the launchpad specified in the title and a custom board using the TM4C123GH6PM, and would like to debug it using the ICDI/JTAG interface of the launchpad, but I couldn't make it work.

I tried simple actions, like checking the flash memory and reading user registers using LMFlash and UniFlash, but the only thing I could do was running the unlock sequence.

Is this setup supported, or I really need another hardware to debug the TM4C123GH6PM?