thejayman77
ec82764bef
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>
47 lines
1.2 KiB
Markdown
47 lines
1.2 KiB
Markdown
# Decision 0004: First Visible Milestone
|
|
|
|
Status: `Locked`
|
|
|
|
## Context
|
|
|
|
The project needed a first milestone that would produce fast, meaningful signal
|
|
without conflating platform-video integration with EE/BIOS bring-up.
|
|
|
|
## Options considered
|
|
|
|
1. BIOS fetch only.
|
|
2. GS-stub test pattern only.
|
|
3. Minimal homebrew EE graphics.
|
|
4. Split first milestone into two parallel proofs.
|
|
|
|
## Decision
|
|
|
|
Adopt a `split first milestone` with two parallel proofs.
|
|
|
|
### Milestone A: platform/video proof
|
|
|
|
- GS-stub test pattern through the platform video path.
|
|
|
|
Purpose:
|
|
|
|
- validate display plumbing,
|
|
- validate retroDE integration,
|
|
- isolate platform-output bugs from CPU/boot bugs.
|
|
|
|
### Milestone B: core/boot proof
|
|
|
|
- EE BIOS fetch and early trace match against DobieStation.
|
|
|
|
Purpose:
|
|
|
|
- validate memory visibility, reset vectors, and EE-side early execution,
|
|
- isolate core bring-up bugs from display-path bugs.
|
|
|
|
## Consequences
|
|
|
|
- Early work can proceed in parallel on platform-video and core-boot tracks.
|
|
- "First success" is no longer overloaded into one giant milestone.
|
|
- Minimal homebrew EE graphics is deferred to a later integration milestone.
|
|
- The stub-module plan should explicitly map which stubs and traces are needed
|
|
for Milestone A versus Milestone B.
|