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All three stashes distilled into docs and dropped: xdp.md carries the AF_XDP record (ixgbe's 3 KB single-buffer XDP cap excludes the locked jumbo mix; XSK need_wakeup TX as the spin-free flow control, zero-copy-or-die, the stray-RX fill-ring trap, BTF-resolved stamp kfunc, wire-weighted size schedule as an unadopted option); connectx-5 README gains the PCICONF/ICMD/MCIA gateway constants so a rebuild needs no mstflint re-mine; e810 keeps the read-side transport map (cage-cache, bus=port, bus-5 phantom, 16-bit-addr hazard, latency as wire-truth) and NVM rollback pointers; x710 the >=30 ms EEPROM write pacing; fibergaga the empirical vendor-space finds; fs the inert-I2C-surface map; state.md stash section now empty

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flamingcow
2026-08-19 14:42:13 -07:00
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docs/modules/fs/README.md
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@@ -16,6 +16,12 @@ PHY at I2C 8-bit **0xAC write / 0xAD read**.
- Single-byte reads see the bridge as inert (returns 0) — the DevAD-prefixed frame + delay is mandatory. This is why early probing wrongly declared 0x56 dead. Treat 0x0000 reads as retry-with-longer-delay: 0 is also the bridge's not-ready signature.
- Recorded for a future multi-byte firmware transport (mlx5 MCIA shape): read = write `[001+devad,RegH,RegL]` offset_size=1, STOP, >1 ms, read 2 B offset_size=0; write = offset_size=2, addr = devad<<8|RegH, data = `[RegL,DataH,DataL]`.
## The rest of the I2C surface (probed exhaustively over a real write path)
- **Undeclared live DOM**: A0h byte 92 (0x5C) claims no DDM, but A2h 0x60+ serves real temperature/Vcc/bias/power (~79 °C, 3.25 V observed on bench). Usable read-only.
- **A2h 0x00–0x7A takes writes and is plain memory, not a mailbox**: every non-volatile byte holds any value, tagged block writes cause zero side effects anywhere in A2h, and sliding the command-handler STATUS signature (1E.4037, idle 0x0004) across every consecutive 3-byte window in both byte orders never surfaced it. 0x7B–0xFF does not take writes (0x7B–0x7E RollBall password area, write-only by convention; 0x7F page register pinned 0xFF; upper half reads zeros).
- The 7-bit 0x53 window ACKs every read and write and always serves zeros — inert, unlike 0x56, whose zeros were the unframed bridge.
## Host interface (XFI) bring-up gating
**The module never enables its XFI TX toward the host until it receives valid host signal** — observed live on the ConnectX-5, where it produces a mutual-wait deadlock ([../../nics/connectx-5/README.md](../../nics/connectx-5/README.md)):