thanks for the reply! The CPUs of the boards I am using are all based on Arm-v8(.2), but I found the components' addresses in the manuals of the SoCs.

I managed to modify the Devicetree by writing my own .dtsi file (see attachment) and finally got the CoreSight devices in /sys/devices/.

However, dmesg shows the following:

[    0.000000] Booting Linux on physical CPU 0x0

[    0.000000] Linux version 4.9.253-coresight (user@user-desktop) (gcc version 7.5.0 (Ubuntu/Linaro 7.5.0-3ubuntu1~18.04) ) #1 SMP PREEMPT Wed Jan 1 18:45:04 CET 2025

[    0.000000] Boot CPU: AArch64 Processor [411fd071]

(omitted 87 lines)

[    0.212039] DTS File Name: /home/user/Downloads/Linux_for_Tegra/source/public/kernel/kernel-4.9/arch/arm64/boot/dts/../../../../../../hardware/nvidia/platform/t210/porg/kernel-dts/tegra210-p3448-0000-p3449-0000-a02.dts

[    0.212045] DTB Build time: Jan  1 2025 16:04:45

(omitted 35 lines)

[    0.420616] DTS File Name: /home/user/Downloads/Linux_for_Tegra/source/public/kernel/kernel-4.9/arch/arm64/boot/dts/../../../../../../hardware/nvidia/platform/t210/porg/kernel-dts/tegra210-p3448-0000-p3449-0000-a02.dts

[    0.420622] DTB Build time: Jan  1 2025 16:04:45

(omitted 75 lines)

[    0.524166] OF: amba_device_add() failed (-19) for /funnel_bccplex@73001000

(omitted 367 lines)

[    1.330484] OF: graph: no port node found in /etf@72030000

[    1.330757] OF: graph: no port node found in /etr@72050000

[    1.330987] OF: graph: no port node found in /funnel_major@72010000

[    1.331238] OF: graph: no port node found in /ptm0@73440000

[    1.331451] coresight-etm4x 73440000.ptm0: CPU0: Cortex-A57 ETM v4.0 initialized

[    1.331482] OF: graph: no port node found in /ptm1@73540000

[    1.331689] coresight-etm4x 73540000.ptm1: CPU1: Cortex-A57 ETM v4.0 initialized

[    1.331719] OF: graph: no port node found in /ptm2@73640000

[    1.331938] coresight-etm4x 73640000.ptm2: CPU2: Cortex-A57 ETM v4.0 initialized

[    1.331944] extcon-disp-state extcon:disp-state: cable 47 state 0

[    1.331946] Extcon AUX1(HDMI) disable

[    1.331976] OF: graph: no port node found in /ptm3@73740000

[    1.332192] coresight-etm4x 73740000.ptm3: CPU3: Cortex-A57 ETM v4.0 initialized

[    1.332250] OF: graph: no port node found in /replicator@72040000

[    1.332305] coresight-replicator-qcom 72040000.replicator: REPLICATOR 1.0 initialized

[    1.332350] OF: graph: no port node found in /stm@72070000

[    1.332386] coresight-stm 72070000.stm: stm_register_device failed, probing deffered

(omitted 64 lines)

[    1.411751] OF: graph: no port node found in /stm@72070000

[    1.412025] coresight-stm 72070000.stm: STM32 initialized

(omitted 212 lines)

Do you have an idea what I did wrong? In the end, I want to be able to follow the steps described here:

https://docs.nvidia.com/jetson/archives/l4t-archived/l4t-3275/index.html#page/Tegra%20Linux%20Driver%20Package%20Development%20Guide/debugging_PTM.html#wwpID0E0NC0HA

Best regards,

Vincent