# v1.2.6 — FDR statistics around the traffic run, and unused lanes turned off before the baseline

## ✨ New features

**`blanton_fdr.sh` — FDR statistics through `phydiag fdrstat`**
* Four sub-commands, each run on unit 0 then unit 1, over ports `'1-259,270-565'`:
  `start` (`fdrstat STArt bin_group=both Interval=30`), `clear` (`fdrstat clear`), `rdcnt` (`fdrstat Counters`), `stop` (`fdrstat STOp`).
* Output is printed as is, under a `### [time] unit N: ...` header — no parsing, no PASS/FAIL.
* `-u 0` / `-u 1` for one switch unit, `-i <sec>` for the interval, `-n` for a dry run. `FDR_PORTS` overrides the port list.

**FDR runs alongside the traffic test in Script A, B and C**
* **Script A** wraps its traffic baseline: `fdr start` after `init`, `fdr clear` after `clear`, `fdr rdcnt` after the run, `fdr stop` after the traffic stop. The traffic run is now **40 s instead of 15 s**, so the counters are read after the first 30 s interval has been published — the same rule as `prbsstat Ber`.
* **Script B** starts and clears FDR with the traffic setup, before the soak loop — the counters run for the whole soak — and reads them (`rdcnt`) in every soak round, after the Tray ID stress.
* **Script C** reads them (`rdcnt`) before stopping the traffic and stops FDR after it — the closing read of the counters Script B started.

**Script A turns off the unused lanes before the BER baseline**
* `unused_lanes.sh off` — TX squelch on the unused retimer lanes and TSC31 (`cd112-cd115`) disabled on the TH6, on both switch boards.

## 📦 Downloads

| File | Contents |
|---|---|
| `Script_ABC_Blanton_V1.2.6.zip` | The full Tera Term working directory, including `Blanton_Script/` to copy onto the DUT |

```bash
chmod +x ~/Blanton_Script/*.sh
grep -rlU $'\r' ~/Blanton_Script    # expect no output
```

## ⚠️ Before you run

* **`chmod +x` after deploying.** `blanton_fdr.sh`, `unused_lanes.sh` and `retimer_lanes.sh` are all called by path; `unused_lanes.sh` also refuses to start if `retimer_lanes.sh` is not executable.
* **`blanton_fdr.sh stop` sends `fdrstat STOp` — that keyword is inferred from `prbsstat STOp` and has not been checked on the bench.** `bcmcmd` exits 0 even when the BCM shell rejects a command, so if it is wrong, FDR keeps running and only the log shows it. Check the first run.
* **FDR only runs when both switch units are enabled** (`SWB_UNIT0 = SWB_UNIT1 = 1`). The single-unit branches have no FDR, and Script A's single-unit traffic run is still 15 s.
* **Script B's per-round `fdr rdcnt` is not gated by the unit settings** — with one unit enabled, FDR was never started and each round just logs whatever `fdrstat Counters` returns.
* **Nothing turns the unused lanes back on.** Script C has no `unused_lanes.sh on`; run it by hand when the DUT is needed in its normal state. Whether a reboot clears it has not been checked.
* **`unused_lanes.sh off` is not gated by `SWB_UNIT0` / `SWB_UNIT1`** — it always acts on both boards.
* **`blanton_ber.sh` (Script A / C) still uses `p=3` and `sleep 30`**; see v1.2.5.
* **Script 4 has no teardown**: finish it with `blanton_tr518.sh stop` **and** `systemctl stop mlucas-amm`.
* **`FAN_SPEED` is 100.**

## 🔗 Links

* [ARCHITECTURE.md](https://etgit.et-wen.com/etwen/Blanton_TTL_Script/src/branch/main/ARCHITECTURE.md) — test flow, data models, constraints
* [CLAUDE.md](https://etgit.et-wen.com/etwen/Blanton_TTL_Script/src/branch/main/CLAUDE.md) — commands and the bench gotchas

**Full changelog:** [V1.2.5...V1.2.6](https://etgit.et-wen.com/etwen/Blanton_TTL_Script/compare/V1.2.5...V1.2.6)