# Hardware Validation Matrix — Red Bear OS

| Component | QEMU | Bare Metal | Notes |
|-----------|------|------------|-------|
| **Storage** | | | |
| AHCI SATA | ✅ | 🔲 | NCQ structure present, not runtime-validated |
| NVMe | 🔲 | 🔲 | Basic driver, no multiqueue |
| virtio-blk | ✅ | N/A | QEMU only |
| **Network** | | | |
| e1000 | 🔲 | 🔲 | ITR structure present, no offload validation |
| rtl8168 | 🔲 | 🔲 | PHY config present, not runtime-tested |
| virtio-net | ✅ | N/A | QEMU only |
| **Audio** | | | |
| Intel HDA | 🔲 | 🔲 | Codec detection + jack sense added, not validated |
| AC97 | 🔲 | 🔲 | Basic driver |
| **Input** | | | |
| PS/2 | ✅ | 🔲 | QEMU keyboard/mouse work |
| USB HID | ✅ | 🔲 | Keyboard/mouse autospawn via test-usb-qemu.sh (P1 hardening); not validated on real HW |
| **USB** | | | |
| xHCI host controller | ✅ | 🔲 | Interrupt-driven mode proven (test-xhci-irq-qemu.sh); 51-flag quirk table + HCCPARAMS2 gating (P2-A/B); 36-code error recovery (P2-C); not HW-validated |
| EHCI/UHCI/OHCI controllers | 🔲 | 🔲 | Compile clean; runtime enumeration proofs planned (P8-B) |
| USB storage (BOT) | ✅ | 🔲 | usbscsid autospawn + bounded sector readback proven (test-usb-storage-qemu.sh); guest-side write verify open |
| USB hub (non-root) | ✅ | 🔲 | Hub + hub-child enumeration proven in QEMU (test-usb-hub-qemu.sh): hub descriptor/EP1/scan/debounce/reset→enable, and usb-kbd behind hub enumerates to HID subdriver (class 3.1 keyboard); "reactor race" root-caused to startup latency under load (not a deadlock) |
| **GPU/Display** | | | |
| VESA | ✅ | 🔲 | QEMU framebuffer works |
| virtio-gpu | ✅ | N/A | 2D only, QEMU |
| **CPU/Power** | | | |
| cpufreqd | 🔲 | 🔲 | Governors implemented, not HW-validated |
| thermald | 🔲 | 🔲 | ACPI thermal zones, not HW-validated |
| **SMP** | | | |
| x2APIC/SMP | ✅ | ✅ | Multi-core works |

✅ = validated  🔲 = implemented, not validated  N/A = not applicable

### Status note (2026-07-20)

- The login-based QEMU proofs (PS/2 + serio, monotonic timer, IOMMU first-use, USB storage BOT)
  now run through `local/scripts/qemu-login-expect.py` (stdlib python) instead of the host
  `expect` tool — no external dependency, per-step timeouts, and safe retry on premature QEMU
  death. See `local/docs/IRQ-AND-LOWLEVEL-CONTROLLERS-ENHANCEMENT-PLAN.md` § "Runtime proof
  status (2026-07-20)".
- MSI-X (virtio-net) and xHCI interrupt-driven mode were re-confirmed on the current
  `redbear-mini` ISO — once more on 2026-07-20 ~09:10 JST via `test-lowlevel-controllers-qemu.sh`
  (log-grep legs, unaffected by host contention).
- Re-confirmation of the login-based legs (PS/2, timer, BOT) with the new
  harness is pending an uncontended host — the current build host runs a parallel QEMU-testing
  workload (a concurrent agent session under `~/.claude/jobs/` with its own QMP-controlled
  guest) that SIGKILLs competing QEMU processes; boots reach getty but the
  login prompt is not observed within the timeout there. The ✅ marks above reflect prior
  validation of those legs. A retry loop (`/tmp/opencode/a2-retry.sh`) is armed to run the
  PS/2, timer, and USB-storage legs automatically once the foreign QEMU workload exits.
- The IOMMU first-use leg currently skips on `redbear-mini` runs because
  `build/x86_64/redbear-full/harddrive.img` is absent — a `redbear-full` build is required
  to re-confirm that leg.
- Display boots (`-vga std`) can freeze at the fbcond `Performing handoff` step (the
  `reopen_for_handoff()` path can block rather than return `EAGAIN` for retry). Headless
  (`-vga none`) boots avoid it. Tracked separately on the graphics stack.