# Spark -- DGX Finetuning

Docs, scripts, and recipes for finetuning on the DGX Spark.

## Target Host: sin (sinanju)

| Field | Value |
|---|---|
| Hostname | `sin` / `sinanju` |
| User | `madcat` |
| LAN | `192.168.88.108` |
| WireGuard (mesh) | `10.44.0.2` |
| SSH | `ssh sin` or `ssh madcat` (LAN), `mesh-sin` (WG) |

### Hardware

| Component | Spec |
|---|---|
| Model | NVIDIA DGX Spark Founders Edition |
| Baseboard | P4242, rev A.7 |
| GPU | GB10 (sm_121) |
| Memory | ~128 GiB unified (CPU+GPU shared) |
| NIC | Realtek RTL8127 10GbE |
| WiFi | MediaTek 7925 |
| Architecture | aarch64 |

### Software

| Component | Version |
|---|---|
| DGX OS | 7.5.0 |
| Kernel | 6.17.0-1018-nvidia |
| Driver | 580.159.03 |
| BIOS | 5.36_0ACUM018 |

### Services

- **Ollama** -- localhost:11434 (local model serving)
- **opencode-serve** -- 0.0.0.0:4096 (systemd user service)
- **DGX Dashboard** -- localhost:8787

### Key Paths

```
/etc/dgx-release                          # version manifest
/opt/nvidia/nvfwupd/bin/nvfwupd            # firmware update tool
/opt/nvidia/bin/spark-ota-check            # OTA check CLI
/home/madcat/.config/opencode/opencode.jsonc  # opencode config
```

## Repo Structure

```
spark/
  AGENTS.md        # this file
```

## Notes

- `nvidia-smi` showing N/A is **normal** for Spark -- it's not a discrete GPU
- GB10 uses unified memory; no separate VRAM
- BIOS `_0ACUM023` exists but is not in OTA pipeline (request via NVIDIA support)
- Known BIOS issue: early firmware can hang during long-context (~200k tok) vLLM prefill