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target-debug: list etm-trace as the instruction-level channel

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Fifth capture view alongside usbmon/kernel/target/wire: exact execution
history via J-Trace, existing only where the trace header is wired -
confirm with the user before reaching for it.
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hathach
2026-07-24 15:49:03 +07:00
parent d7f1bbb6e5
commit 08c4c558a7
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.claude/skills/target-debug/SKILL.md
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@ -16,6 +16,7 @@ Raspberry Pi). Pick capture channels by which end runs Linux, not by habit:
| `usb-kernel-debug` | why the Linux kernel acted (dmesg / dynamic debug) | Linux on either end: PC host or Linux gadget peer |
| **`target-debug`** | **what the target did** (logs, driver state, PC) | always — either role, needs a debug probe |
| `usb-sniffer` | what crossed the wire (PIDs, handshakes, resets) | hardware tap cabled in — role-agnostic |
| `etm-trace` | exactly which instructions executed (profile, coverage, history) | SEGGER J-Trace wired to this board's trace header — confirm with the user first |
For enumeration/transfer bugs the default posture is **dual-side capture** —
both ends simultaneously: usbmon + a target