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thejayman77 ec82764bef Initial commit: retroDE_ps2 — first-of-its-kind PS2 GS FPGA core (DE25-Nano / Agilex 5)

RTL (GS rasterizer, EE core stub, platform bridge, LPDDR4B path), sim regression
(272 TBs), docs, and tooling. Copyrighted PS2 content (BIOS, game code, GS dumps,
and all dump-derived textures/traces) is excluded via .gitignore and stays local.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

2026-06-29 20:10:50 -04:00

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third_party Licensing and Provenance Policy

This file sets the policy for externally-derived material before any of it is vendored into the retroDE_ps2 repository. It is deliberately written early so that provenance discipline is in place from the start rather than retrofitted.

Principles

No material is vendored into this repository without a recorded source, license, and adaptation note.
Sony confidential documentation (see "Sensitive sources" below) is referenced and studied but is not distributed from this repository.
Open-source material brought in must carry its original license and attribution, and that license must be compatible with the eventual retroDE_ps2 distribution terms.
BIOS ROM images are never committed. Users supply their own dumps.

Sensitive sources (reference-only, not to be vendored)

The following documents are useful technical references but are Sony confidential-origin leaks. They inform our contracts but must not be copied into this repository:

GS User's Manual v6.0 (Sony Computer Entertainment Inc.)
VU User's Manual / Emotion Engine Vector Operation Unit Guide (Sony)

Treat these as reference-only. Cite them in contract docs when appropriate, but do not include excerpts beyond what is defensible under normal engineering-analysis fair-use practice.

BIOS and firmware

Real PS2 BIOS images are copyrighted by Sony and are not distributed here.
The repository may include checksums, region-identifying metadata, loading scaffolding, and test harnesses that expect a user-supplied dump to be placed in a known local location.
If an HLE BIOS stub strategy is adopted in any phase (see BIOS policy decision), the HLE code is original to this project and must be written from clean-room hardware references, not derived from commercial firmware.

Imported open-source material

If code from PCSX2, Play!, DobieStation, ps2dev/ps2sdk, gsKit, PSX_MiSTer, or other open-source projects is ever adapted into this repository, it must be placed under third_party/<project>/ with:

the original upstream URL,
the original license file,
the upstream commit or version identifier captured at import time,
a NOTES.md describing local modifications.

License compatibility must be confirmed before the import lands on main.

Status

No external material has been vendored as of 2026-04-16. This file defines the policy that applies when that changes.

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