# Phase 0 Checklist

This is the architecture-lock checklist to complete before substantial RTL work.

Decision records under `docs/decisions/` are the source of truth for locked
choices. This checklist is now a progress/navigation view.

## Locked decisions

- [x] Posture — locked: staged subset on current hardware — see
  `docs/decisions/0001-posture.md`
- [x] BIOS policy — locked: real BIOS plus narrow debug stubs — see
  `docs/decisions/0002-bios-policy.md`
- [x] Golden reference strategy — locked: multiple references with role
  separation — see `docs/decisions/0003-golden-reference.md`
- [x] First visible milestone — locked: split platform/video proof and
  EE/BIOS trace proof — see
  `docs/decisions/0004-first-visible-milestone.md`
- [x] Trace format — locked: common text envelope plus subsystem-specific
  payloads — see `docs/decisions/0000-trace-format.md`

## Still to lock

- [ ] Memory architecture policy
- [ ] Media/storage policy
- [ ] Validation posture beyond the initial trace-format choice

## Required documents

- `docs/contracts/memory.md`
- `docs/contracts/ee.md`
- `docs/contracts/intc.md`
- `docs/contracts/dmac.md`
- `docs/contracts/gif_gs.md`
- `docs/contracts/sif.md`
- `docs/contracts/validation.md`

## Exit criteria for Phase 0

- Major subsystem ownership is written down.
- The memory and DMA contracts are explicit enough to build stubs.
- The first three milestones are named and measurable.
- The team agrees on what is allowed to be stubbed in Phase 1.