J-Link Thread Awareness Support in Zephyr/ZMK

[schengnz]

Zephyr has recently added thread awareness support for J-Link (zephyrproject-rtos/zephyr#34660). Since J-Link is the industry standard for on-device probe, it would be great if we could roll in this support into ZMK as part of #736.

[joelspadin]

It looks like that just updates the west debug command to run J-Link with the correct arguments to enable the Zephyr plugin. If you are debugging through VS Code, something like this should be close to what that change uses:

{
  "debugServerPath": "C:\\Program Files (x86)\\SEGGER\\JLink\\JLinkGDBServerCL.exe",
  "debugServerArgs": "-select usb -port 2331 -if SWD -speed auto -device nRF52840_xxAA -silent -singlerun -nogui -rtos GDBServer\\RTOSPlugin_Zephyr",
}

[schengnz]

We also need support for CONFIG_DEBUG_THREAD_INFO=y, which is not in 2.4 branch.

[joelspadin]

It looks like CONFIG_DEBUG_THREAD_INFO was added after v2.5, so we'll need to wait for 2.6 to get that.