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comments)","accounts_in_message":[],"_revision_number":1}],"current_revision":"e37057465e6fe31036447986ec47cbf28db35684","revisions":{"e37057465e6fe31036447986ec47cbf28db35684":{"kind":"REWORK","_number":1,"created":"2026-04-23 19:13:21.000000000","uploader":{"_account_id":1002512,"name":"will-tm","email":"william.markezana@gmail.com","username":"will-tm"},"ref":"refs/changes/86/9586/1","fetch":{"anonymous http":{"url":"https://review.openocd.org/openocd","ref":"refs/changes/86/9586/1","commands":{"Branch":"git fetch https://review.openocd.org/openocd refs/changes/86/9586/1 \u0026\u0026 git checkout -b change-9586 FETCH_HEAD","Checkout":"git fetch https://review.openocd.org/openocd refs/changes/86/9586/1 \u0026\u0026 git checkout FETCH_HEAD","Cherry Pick":"git fetch https://review.openocd.org/openocd refs/changes/86/9586/1 \u0026\u0026 git cherry-pick FETCH_HEAD","Format Patch":"git fetch https://review.openocd.org/openocd refs/changes/86/9586/1 \u0026\u0026 git format-patch -1 --stdout FETCH_HEAD","Pull":"git pull https://review.openocd.org/openocd refs/changes/86/9586/1","Reset To":"git fetch https://review.openocd.org/openocd refs/changes/86/9586/1 \u0026\u0026 git reset --hard FETCH_HEAD"}}},"commit":{"parents":[{"commit":"7e508338ed0dd3ce2b5fb5b6654ff51125258812","subject":"target/riscv: add target_was_examined() checks"}],"author":{"name":"William Markezana","email":"william.markezana@gmail.com","date":"2026-04-10 16:45:43.000000000","tz":-240},"committer":{"name":"William Markezana","email":"william.markezana@gmail.com","date":"2026-04-23 19:13:10.000000000","tz":-240},"subject":"jtag/drivers: add T-Head CK-Link JTAG adapter driver","message":"jtag/drivers: add T-Head CK-Link JTAG adapter driver\n\nAdd support for the T-Head CK-Link Lite V2 probe family, including the\nBouffalo Lab BL616/BL702 CK-Link clones used as built-in debuggers on\nBL618/BL702 evaluation boards. The wire protocol is a framed command\nformat over USB bulk endpoints, reverse-engineered from T-Head\u0027s\nDebugServer binary.\n\nThe driver implements:\n\n  - Full DebugServer init sequence: selfreg setup, operational clock,\n    5-wire -\u003e 2-wire -\u003e 5-wire mode toggle (effective TAP reset).\n  - JTAG_SCAN via the probe\u0027s single-entry batch opcode with IR caching\n    across execute_queue boundaries; end-of-queue flush populates the\n    IR scan\u0027s in_value with hardware-captured Capture-IR data.\n  - Opcode-aware response-frame checksum validation. Selfreg reads use\n    sum-mod-256; JTAG batch responses exclude the last dr_tdo byte.\n  - Clock-divider control (freq_kHz \u003d 48000 / (N+1)) with once-warning\n    clamp when the requested speed exceeds the DebugServer-validated\n    ceiling (2526 kHz).\n  - libusb serial-number filter via adapter_get_required_serial()\n    and kernel-driver auto-detach on Linux.\n  - TCL command \u0027cklink vid_pid (vid pid)+\u0027 to override defaults.\n\nKnown protocol limitations, surfaced as one-time warnings rather than\nsilent data loss:\n\n  - Scans exceed 255 bits: the batch opcode encodes bit-counts in single\n    bytes. Clamp + TDI pass-through for the un-shifted portion, which\n    gives OpenOCD\u0027s bypass chain-length probe the expected end-of-chain\n    marker.\n  - Back-to-back IR scans: the batch opcode requires both IR and DR\n    phases; mid-queue flushing a deferred IR with a dummy DR would\n    trigger spurious DMI transactions. Single-TAP chains only.\n  - JTAG_TMS, JTAG_PATHMOVE: no TMS-sequence opcode exposed. Return\n    ERROR_JTAG_NOT_IMPLEMENTED.\n  - RTCK: not supported, return ERROR_JTAG_NOT_IMPLEMENTED.\n\nTested against BL618 (VID 0x42bf, PID 0xb210) and BL702 eval boards:\nIDCODE read, RISC-V DM examine, halt, register read, memory read,\nsingle-step, hardware breakpoints, GDB RSP server all functional.\n\nChange-Id: If6adaec0445748f3e97078bf980c502eff4d5001\nSigned-off-by: William Markezana \u003cwilliam.markezana@gmail.com\u003e\n"}}},"requirements":[],"submit_records":[{"rule_name":"gerrit~DefaultSubmitRule","status":"NOT_READY","labels":[{"label":"Verified","status":"OK","applied_by":{"_account_id":1000014,"name":"jenkins","username":"jenkins","tags":["SERVICE_USER"]}},{"label":"Code-Review","status":"NEED"}]}],"submit_requirements":[{"name":"Verified","status":"SATISFIED","is_legacy":true,"submittability_expression_result":{"expression":"label:Verified\u003dMAX -label:Verified\u003dMIN","fulfilled":true,"status":"PASS","passing_atoms":["label:Verified\u003dMAX","-label:Verified\u003dMIN"],"failing_atoms":[]}},{"name":"Code-Review","status":"UNSATISFIED","is_legacy":true,"submittability_expression_result":{"expression":"label:Code-Review\u003dMAX -label:Code-Review\u003dMIN","fulfilled":false,"status":"FAIL","passing_atoms":[],"failing_atoms":["label:Code-Review\u003dMAX","-label:Code-Review\u003dMIN"]}}]}