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BDY‑G18 Pro Armbian Builder – Deployment Overview

Workspace: BDYG18ProArmbianBuilder (type development)
Scope: Reproducible creation of a flash‑able Armbian image for the BDY‑G18‑Pro RK3568 router and reliable programming of the device via the Rockchip RKDevTool utility.

1. Project Goal & Target Image

  • Goal: Produce a reproducible, flash‑able Armbian image (Community DIY 13.3 Debian Trixie) with kernel 6.18.x (current build 6.18.40).
  • Preferred image: stock – uses the vendor‑verified boot chain (U‑Boot SPL/U‑Boot on SPI‑NOR) with a minimal Armbian rootfs.
  • Self‑built mode is available for auditability.

Sources: c650c1e4-18ee-44ad-af42-b7632fbdcf5c, dd496c6d-1619-457d-86a9-da57f5b866d7, aa3057ab-54c5-4ffc-ba85-c2f2396ee60c

2. Repository Layout & Build Infrastructure

Directory Purpose
arm64‑custom/ Build scripts (build_g18pro.py, build_g18pro.ps1).
evidence/ Collected logs, DTB files, kernel configs.
outputs/armbian-g18pro/ Final artefacts – compressed image, SHA‑256 manifest, verification report, build log.
armbian‑g18pro‑cache (Docker volume) Persistent cache (~19 GB) for U‑Boot, kernel, rootfs, ccache.

Sources: adb3722a-51e7-4ec5-88cc-a95dc399a7a1, Batch 2/16

The Docker image used is ghcr.io/armbian/docker-armbian-build:armbian-ubuntu-noble-latest. The orchestrator is a Python script plus a PowerShell wrapper that works on Windows PowerShell or Linux Bash.

Sources: adb3722a-51e7-4ec5-88cc-a95dc399a7a1

3. Flash Procedure (RKDevTool)

  1. Verify target storage – select EMMC (not SPI‑NOR) in the Read Flash Info dialog.
  2. Use RKDevTool V3.37+ (the latest revision listed in the change log).
  3. Load the preferred loader rk356x_spl_loader_v1.25.114.bin (SHA‑256 d7db6f39…9bba).
  4. Download Boot – copies the loader to DDR (RAM) only; no persistent write.
  5. (Optional) Switch Storage if the board has multiple media (UFS, SPI‑NOR).
  6. Burn Loader – writes the ID‑Block (SPL) to the selected storage.
  7. Flash partitions – address 0x00000000, force‑address‑write enabled, load the compressed .img.xz (≈ 2.12 GiB).
  8. After flashing, run systemctl reboot (the syscon‑reboot‑mode DTB node forces a clean reboot).
  9. Verify with rkdevtool verify or compare the SHA‑256 manifest against the image file.

Sources: 6, 7, 16 (loader 1), 818f5e7c-bf74-4bb0-9bb0-187f7243cf18

3.1 Loader Provenance

Loader SHA‑256 Size Build date Remarks
rk356x_spl_loader_v1.25.114.bin d7db6f39…9bba 481 KB 2026‑01‑09 Clean upstream copy – primary choice.
rk356x_spl_loader_v1.21.113.bin 589f1a70…8f8b 475 KB – 8‑byte timestamp/CRC delta – secondary fallback.
rk3568_MiniLoaderAll.bin 512211c9…3315d2 481 KB – 10‑byte delta – tertiary fallback.

Sources: 16 entries 1‑3

4. Kernel & System Configuration

  • Kernel: Linux 6.18.40‑current‑rockchip64 (Armbian 26.05.0).
  • DTB: rk3568‑bdy‑g18‑pro.dtb (stock) with the following key patches applied:
    • syscon‑reboot‑mode node (clean reboots).
    • snps,tso removed (TSO disabled).
    • GMAC0 reset‑storm disabled.
  • Root‑flags: rw,errors=remount-ro aligned in both armbianEnv.txt and extlinux.conf.
  • Networking: TCP congestion control set to Cubic; TSO/GSO disabled.
  • Docker: Cache volume retained, cgroup options added via armbianEnv.txt.

Sources: aa3057ab-54c5-4ffc-ba85-c2f2396ee60c, ff34c6eb-6bba-41e5-9e43-ff80941fa823, evidence/live-system/as-shipped-snapshot.txt, evidence/live-system/tso-fix-verification-2026-07-31.txt, evidence/vendor-backup/vendor-armbianEnv.txt, evidence/vendor-backup/vendor-extlinux.conf

5. Key Decisions & Rationale

# Decision Rationale
1 Keep stock U‑Boot (no custom SPL compile). Simplifies firmware supply‑chain; stock boot chain is verified.
2 Remove original emergency‑reboot.shutdown hook (now redundant). The new emergency‑restart script (sysrq‑b) already guarantees clean reboots.
3 Add syscon‑reboot‑mode DTB node and enable it. Fixes power‑off hang; clean reboot works without manual power‑cycle.
4 Disable hardware TSO (snps,tso). Eliminates massive retransmission storms; network throughput ↑ to 29.6 Mbps.
5 Set TCP congestion to Cubic via sysctl. Improves TCP performance on the router.
6 Enforce SHA‑256 verification of flashed images. Prevents accidental NOR overwrite (Failure A on 2026‑07‑25).
7 Strip proxy variables inside Docker; optional G18PRO_PROXY. Avoids proxy leakage into container builds.
8 Force LF line endings via .gitattributes; disable core.autocrlf. Prevents CRLF corruption in containers.
9 Compress final image with xz and record SHA‑256. Size savings and reproducibility.
10 Use Vaultwarden for credential storage – repository stores only entry name and purpose. Secrets never appear in VCS.
11 AI / Git integration disabled by default. Keeps builds deterministic.
12 Shallow Git clones, pin RKBIN_GIT_COMMIT=ce50c0d1. Faster, reproducible builds.

Sources: aa3057ab-54c5-4ffc-ba85-c2f2396ee60c, ff34c6eb-6bba-41e5-9e43-ff80941fa823, bf88c265-4749-4c50-85bc-4bae25298cd5, adb3722a-51e7-4ec5-88cc-a95dc399a7a1, Batch 2/16, 105b328f-4bda-4641-90a7-7282ef156316

6. Open / Ongoing Deployment Tasks

# Task Status
1 Verify tiny‑SPI SPL can read > 8 MiB from SPI‑NOR. Unresolved – needs measurement.
2 Add missing interrupt‑controller node for RTL8367S in DTB. Open.
3 Validate PCIe BAR allocation (pci=realloc). Planned.
4 Pin RKBIN_GIT_COMMIT permanently (currently ce50c0d1). Open.
5 Test selfbuilt‑ums mode (USB‑mass‑storage) for field diagnostics. Open.
6 Implement post‑flash verification watchdog script. Open.
7 Keep rockusb.inf catalog signed (rockusb.cat). Unresolved – required for driver signing enforcement.

Sources: aa3057ab-54c5-4ffc-ba85-c2f2396ee60c, evidence/emmc-reset-evaluation.txt, evidence/live-system/tso-diagnosis-2026-07-31.txt, 13, 14, 15

7. Preferences (Scenario‑Level)

  • Language: Chinese (documentation).
  • Primary host: Windows (PowerShell) with Bash support.
  • Design philosophy: KISS & YAGNI; shallow clones; LF line endings; Docker cache retained.
  • Secrets: Vaultwarden only.
  • AI/Git integration: Disabled unless explicitly enabled.

Sources: ff34c6eb-6bba-41e5-9e43-ff80941fa823, bf88c265-4749-4c50-85bc-4bae25298cd5, 105b328f-4bda-4641-90a7-7282ef156316, 3f91189b-11a1-45bb-8357-4f413dc1609d

8. Tags

deployment, flash, loader, kernel, dtb, docker, security, documentation

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