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firmware: retire Ake+Bus into one Encryption lever (fw 0.9.0 ABI)

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Firmware 0.9.0 consolidates the Ake (0x06) and Bus (0x07) features into a
single Encryption (0x06) lever; wire id 0x07 no longer exists. The separate
Bus lever was proven inert on BU40N/MT1959 — the one Encryption lever
de-busses on its own — so the unlock recipe now sets one flag where it used
to set two, and the trailing best-effort Set(Bus, off) is gone.

Set(Encryption, STATE_OFF) is the load-bearing step: the drive acts
pre-authenticated, so a bare 0xAD returns the VID with no cert and no AKE,
and content comes back de-bussed. Failure still maps to VidUnavailable.

Hardware-validated against fw 0.9.0 on BU40N 1.00 with a UHD disc: every
sampled unit returns de-bussed and opens with the AACS unit key resolved
from the live keyserver.
This commit is contained in:
Matthew Jackson
2026-09-22 20:32:22 -07:00
parent d257d40de9
commit e107c699d1
5 changed files with 280 additions and 163 deletions
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CHANGELOG.md
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# Changelog
## [1.7.5] — UNRELEASED
### Changed
- firmware: mirror the fw 0.9.0 ABI — `Ake` (`0x06`) and `Bus` (`0x07`) are retired into a single `Encryption` (`0x06`) lever, so the unlock recipe now sets one flag instead of two and wire id `0x07` is gone. Required to talk to firmware 0.9.0.
## [1.7.4] — 2026-09-21
### Maintenance
- CI consolidated to the central reusable workflows; no functional changes.