chore: initial commit of OpenWRT

docs/barebones-image-research.md

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+# Barebones OpenWrt Image Research (GL-AX1800)
+
+## Objectives
+- Create a stripped-down image for GL-AX1800 (Flint 1).
+- Accessible via SSH.
+- No LuCI or GL.iNet UI.
+- Use `gl-infra-builder` for hardware-specific optimizations.
+- Ensure U-Boot compatible image output.
+
+## Tool Selection
+- **Builder:** `FUjr/gl-infra-builder`.
+- **Base Config:** `config-wlan-ap.yml` (Qualcomm SDK based).
+- **Target Profile:** `target_wlan_ap-gl-ax1800`.
+
+## Findings
+### 1. Reorganization
+- Workspace reorganized into `firmware/`, `sdk/`, `docs/`, `scripts/`, `packages/`, `repo/`.
+- Created `PROJECT_INDEX.md` as a master reference.
+
+### 2. gl-infra-builder Logic
+- The builder uses YAML profiles in the `profiles/` directory.
+- `gen_config.py` merges multiple profiles.
+- Standard GL.iNet profiles (`glinet_ax1800.yml`) include a heavy set of proprietary services.
+- A "Barebones" profile can be created by overriding these with `-package` or `CONFIG_PACKAGE_xxx=n` in the `diffconfig` section.
+
+### 3. OpenWrt Snapshots & Upgrade Path
+- **V21.02 (GL 4.x):** Current base for most GL firmware.
+- **V23.05:** Transitional, used `ipq40xx` target.
+- **Master/V24/V25:** Native `qualcommax/ipq60xx` target (merged March 2025).
+- **Upgrade Path:**
+    - From GL Stock -> Vanilla: Flash `factory.ubi` via U-Boot recovery (192.168.1.1).
+    - From Vanilla -> Newer Vanilla: Use `sysupgrade.bin`.
+    - **Note:** Partition layouts might change between 21.02 and 24.x. Using the `factory.ubi` is safest for major transitions.
+
+### 4. Barebones Configuration Plan
+- Include `dropbear` (SSH), `opkg` (Package management).
+- Include essential HW drivers: `kmod-gl-sdk4-hw-info`, `gl-sdk4-led`.
+- Explicitly disable `luci`, `nginx`, and all `gl-sdk4-ui-*` packages.
+- Ensure `ath11k` drivers are included for Wi-Fi (if using OpenWrt master) or the proprietary QSDK drivers (if using the builder).