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2026-09-23 23:16:40 +08:00

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Architecture Overview of the BDYG18Pro Armbian Build System

curated

main/projects/d0abaf3f-da04-4dd4-a228-bacf68f44e8f/curated/development/architecture-overview-of-the-bdyg18-pro-armbian-build-system

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development

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2026-08-12.3

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2026-09-23T15:03:44.457714+00:00

hardware

boot

docker

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Architecture Overview

1. Hardware Platform

Component	Specification
SoC	Rockchip RK3568 – quad‑core Cortex‑A55 @ 2 GHz, Mali‑G710 GPU, VPU, RGA, HDMI, PCIe, USB 3.0.
Memory	8 GB DDR4 HS200 (2.5 V).
Storage	256 GB eMMC (boot + rootfs) + 32 MB Winbond W25Q256JW SPI‑NOR (blank).
Switch	Realtek RTL8367S 5‑port DSA (GMAC1 active, GMAC0 disabled).
Network	Ethernet MAC‑1 (`end0`), TSO disabled, TCP congestion = Cubic.
UART console	`serial@fe660000` → `ttyS2` @ 1 500 000 baud (pins RX/D0, TX/D1).

Source: evidence/dtb/rk3568-bdy-g18-pro.fixed.dts, evidence/dtb/rk3568-bdy-g18-pro.orig.dts.

2. Boot Flow

MaskROM reads SPL from DDR (address 0x08000) after power‑on.
SPL (Rockchip rk356x_spl_loader_v1.25.114.bin preferred) initialises DDR and loads U‑Boot (mainline 2026.04) from the SPL payload.
U‑Boot loads a FIT image (uboot‑fit‑rk3568‑bdy‑g18‑pro.dts) containing BL31, kernel, and DTB.
Kernel Linux 6.18.40‑current‑rockchip64 boots with DTB rk3568‑bdy‑g18‑pro.dtb.

All steps are verified by flashing the SPL to SPI‑NOR, reading back SHA‑256, and confirming boot success (see evidence/selfbuilt-uboot-brideup.txt).

3. Repository Layout & Build Infrastructure

Directory	Purpose
`arm64‑custom/`	Custom board scripts & patches (tracked).
`evidence/`	Raw logs, screenshots, serial captures (tracked).
`aidocs/`	Additional documentation (tracked).
`outputs/armbian-g18pro/`	Final artefacts – compressed image, SHA‑256 manifest, verification report.
`armbian‑g18pro‑cache` (Docker volume)	Persistent cache (~19 GB) for U‑Boot, kernel, ccache.

Build orchestrator: Python script armbian‑custom/build_g18pro.py + PowerShell wrapper build_g18pro.ps1. Docker image ghcr.io/armbian/docker-armbian-build:armbian-ubuntu-noble-latest is used; shallow Git clones (--depth 1) minimise download size.

4. Runtime System State (as of 16 Aug 2026)

Kernel: 6.18.40‑current‑rockchip64
U‑Boot: Mainline v2026.04 on SPI‑NOR; vendor U‑Boot remains on eMMC as fallback.
Network: tso off, cubic congestion, throughput ≈ 30 Mbps.
Power‑off: systemctl poweroff hangs (requires manual power‑cycle); syscon‑reboot‑mode DTB node restores clean reboot.
Docker cache: volume present, speeds up incremental builds.

Source: abe4221f-b290-4384-ad8f-1f72c360b893.

References

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dd496c6d-1619-457d-86a9-da57f5b866d7
S-1
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abe4221f-b290-4384-ad8f-1f72c360b893

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