docs/nics/wx1820/README.md

# Wangxun WX1820 (txgbe) — evaluated, disqualified

- Module I2C is architecturally ideal: kernel `sff`/phylink exposes `/dev/i2c-N` — arbitrary framing, zero patches.
- **Disqualified as product NIC**: PTP-only RX timestamping (verified in upstream `wx_ptp.c` — `HWTSTAMP_FILTER_ALL` falls to -ERANGE), the same limitation as the 82599 with a younger driver.
- Flow-steering/counter parity unverified.
Restructure docs: per-device directories under modules/ and nics/ with co-located datasheets, state centralized in state.md, prose tightened into lists and tables 2026-08-12 19:23:02 -07:00			`# Wangxun WX1820 (txgbe) — evaluated, disqualified`

			- Module I2C is architecturally ideal: kernel `sff`/phylink exposes `/dev/i2c-N` — arbitrary framing, zero patches.
			- Disqualified as product NIC: PTP-only RX timestamping (verified in upstream `wx_ptp.c` — `HWTSTAMP_FILTER_ALL` falls to -ERANGE), the same limitation as the 82599 with a younger driver.
			`- Flow-steering/counter parity unverified.`