41 lines
1.9 KiB
Markdown
41 lines
1.9 KiB
Markdown
# Announcement draft (v0.1.0) — do not post as-is
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Venue plan: OpenWrt forum (Hardware / MediaTek section) first, link from
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r/reverseengineering. Undersell: this is format tooling + docs + update
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tracking; the deep RE comes later.
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---
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Subject: mtk-wifi-fw v0.1 — tooling, format docs, and a changelog for
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MediaTek Connac2 WiFi firmware (mt7915/16/7981/86)
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Body:
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The WiFi firmware on Filogic routers ships in linux-firmware with its
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version strings stripped (`fw_ver = "____000000"`) and no changelog. I've
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been picking the containers apart; first release of the toolkit:
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- **Extractor + ELF export** — carves `*_wm/wa/rom_patch.bin` into their
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load regions and emits EM_NDS32 ELF at true addresses, ready for Ghidra
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(official NDS32 module). Works across mt7915/7916/7981/7986.
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- **Format spec + boot notes** — field-by-field container documentation
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cited to the mt76 loader source, plus how the four images (ROM patch,
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WM, WA, WED WO) load onto the three NDS32 cores.
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- **Recovered version metadata** — the containers carry a second,
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kernel-unused trailer with the *full* build string (branch, MP tag, build
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timestamp). We've indexed every revision ever shipped to linux-firmware
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(54 so far, 2020→2026).
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- **Version diffing** — region-aligned byte equality + string-set diffs.
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Example finding from the 2026 mt7981 build: near-total rework of the
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0xe003b000 code region, new rate-adaptation params (HT 20/40 coex), DPD
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calibration and thermal-power strings — details in the repo's reports.
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No firmware bytes in the repo; tools run against your own linux-firmware
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copy. Everything is tested (any blob you test must be a known upstream
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revision) and CI tracks upstream weekly.
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What's next: Ghidra annotation projects, the MCU command ABI map, and
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eventually documentation of the WM/WA boundary. Feedback welcome,
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especially from mt76 devs and anyone who's looked inside these blobs.
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(link)
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