Adds a CD-command trace to psx-beetle (beetle_cdcmd_trace_hook.patch:
callback in cdc.cpp's command dispatch, wired through beetle_libretro.cpp
into cdrom_cmd_dump / cdrom_cmd_reset on the oracle debug server). This is
the two-process oracle-diff the setup is built for, now working on Linux.
Live-diff result (docs/kula-world-findings.md, bug 3): the oracle's game
reads level data with a clean Setloc->SeekL->Setmode->ReadN->Pause per
sector (SeekL x18, ReadN x22, GetlocL x89). Our runtime's game, in the
wedge, issues NEITHER SeekL NOR ReadN — only GetStat/Init/Setloc/Pause,
an error/retry branch the oracle never enters.
Crucial: our runtime DID deliver 307 sectors during early boot (ReadN +
data delivery work). Reads only stop at frame ~890 — the BIOS mid-game
region revalidation (ReadTOC+GetID). The region fix made that PASS, but
the post-ReadTOC CD state still stops the game resuming reads. Prime
suspect: our ReadTOC (case 0x1E) is a bare stat+COMPLETE stub that does
not model drive repositioning / the track table the game reads to
recompute its seek. Documented for the next session.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BdjxoRB1f9VQsNzZayCgGS
Claude