rockchip: Add CSC board EByte ECB41-PGE (RK3506G)

[vidplace7]

Description

Adds new RK3506G CSC board EByte ECB41-PGE.
This PR also includes uboot patches (dts/defconfig) to enable this board.

Depends on:

• arch: arm: dts: add EByte ECB41-PGE (RK3506g2) linux-rockchip#454
• Add EByte Vendor // ECB41-PGE board armbian.github.io#250

How Has This Been Tested?

• ./compile.sh BOARD=ebyte-ecb41-pge BRANCH=vendor KERNEL_CONFIGURE=no DEB_COMPRESS=xz KERNEL_BTF=yes INSTALL_ARMBIAN_FIRMWARE=no BUILD_DESKTOP=no BUILD_MINIMAL=yes RELEASE=trixie
• ./compile.sh BOARD=ebyte-ecb41-pge BRANCH=vendor KERNEL_CONFIGURE=no DEB_COMPRESS=xz KERNEL_BTF=yes INSTALL_ARMBIAN_FIRMWARE=no BUILD_DESKTOP=no BUILD_MINIMAL=yes RELEASE=noble
• Shell works over builtin USB debug interface (CH340)
• Ethernet works

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules

Summary by CodeRabbit

• New Features
  • Added support for the EByte ECB41-PGE development board based on Rockchip RK3506G2 SoC with 128MB RAM.
  • Configured full hardware integration including dual Gigabit ethernet interfaces, SD card support, SPI-NAND flash, USB OTG, and serial communication.

[coderabbitai]

📝 Walkthrough

Walkthrough

This pull request introduces support for the EByte ECB41-PGE board, a Rockchip RK3506G2-based embedded system with 128MB RAM. Changes include board configuration metadata, U-Boot build flags and subsystem enablements, device tree U-Boot boot-phase properties, and complete hardware peripheral definitions across SPI flash, Ethernet, SD card, USB, UART, and power rail configurations.

Changes

Cohort / File(s)	Summary
Board Configuration config/boards/ebyte-ecb41-pge.csc	Defines board metadata constants (name, vendor, family, maintainer) and enables low-memory extension for 128MB RAM constraint.
U-Boot Build Configuration patch/u-boot/u-boot-rk3506/defconfig/ebyte-ecb41-pge_defconfig	Configures U-Boot build flags for RK3506 architecture, enables core subsystems (DM, MTD), peripherals (Ethernet, USB, MMC, GPIO, LED), and boot parameters (console UART, FDT, load addresses).
Device Tree Definitions patch/u-boot/u-boot-rk3506/dt/rk3506g-ebyte-ecb41-pge-u-boot.dtsi, patch/u-boot/u-boot-rk3506/dt/rk3506g-ebyte-ecb41-pge.dts	U-Boot snippet adds boot-phase markers for flash and SD card detection; full DTS provides complete hardware definitions including regulators, Gigabit MACs with RMII PHYs, SPI-NAND flash, SD card controller, USB 2.0 OTG, UART, SARADC, and comprehensive pinctrl mappings.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

Poem

🐰 A new board joins our warren today,
EByte's ECB41, ready to play!
With flash and Ethernet, USB and more,
RK3506 opens a hardware door.
From config to device trees so clear,
Our embedded dreams are drawing near! 🌟

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately and concisely describes the main change: adding support for a new Rockchip RK3506G board (EByte ECB41-PGE). It is clear, specific, and directly reflects the changeset content.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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[github-actions]

🚫 Missing required board assets

This PR adds new board configuration(s). Required assets must already exist in github/armbian/armbian.github.io.
They are required by Armbian Imager to ensure all boards are displayed with proper images.

• Board images: board-images/<board>.png (1920x1080 px transparent)
• Vendor logos: board-vendor-logos/<vendor>-logo.png (512x512 px transparent)

Missing items

• ❌ Board image missing for ebyte-ecb41-pge

  • Expected: board-images/ebyte-ecb41-pge.png
  • Fix: add the file to armbian/armbian.github.io (folder board-images/)

• ❌ Vendor logo missing for vendor ebyte (used by board ebyte-ecb41-pge)

  • Expected: board-vendor-logos/ebyte-logo.png
  • Fix: add the file to armbian/armbian.github.io (folder board-vendor-logos/)
  • Naming rules: lowercase, dashes (e.g. kobol-logo.png, not Kobol_logo.png)

Once the missing files are added (or a PR is opened in armbian/armbian.github.io), re-run this check.

[coderabbitai]

🧹 Nitpick comments (1)

patch/u-boot/u-boot-rk3506/dt/rk3506g-ebyte-ecb41-pge.dts (1)

12-17: Minor style inconsistency in aliases syntax.

The ethernet0 and ethernet1 aliases use phandle syntax with angle brackets (<&gmac0>), while mmc0 and serial0 use direct path references (&sdmmc). Both forms work, but for consistency, consider using the direct reference form throughout.

🎨 Suggested fix for consistency

 	aliases {
-		ethernet0 = <&gmac0>;
-		ethernet1 = <&gmac1>;
+		ethernet0 = &gmac0;
+		ethernet1 = &gmac1;
 		mmc0 = &sdmmc;
 		serial0 = &uart0;
 	};

🤖 Prompt for AI Agents

Verify each finding against the current code and only fix it if needed.

In `@patch/u-boot/u-boot-rk3506/dt/rk3506g-ebyte-ecb41-pge.dts` around lines 12 -
17, The aliases block mixes phandle angle-bracket syntax and direct references;
update aliases ethernet0 and ethernet1 to use the same direct-reference form as
mmc0 and serial0 by replacing <&gmac0> and <&gmac1> with &gmac0 and &gmac1
respectively so aliases (ethernet0, ethernet1, mmc0, serial0) consistently use
direct phandle references to gmac0, gmac1, sdmmc, and uart0.

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Nitpick comments:
In `@patch/u-boot/u-boot-rk3506/dt/rk3506g-ebyte-ecb41-pge.dts`:
- Around line 12-17: The aliases block mixes phandle angle-bracket syntax and
direct references; update aliases ethernet0 and ethernet1 to use the same
direct-reference form as mmc0 and serial0 by replacing <&gmac0> and <&gmac1>
with &gmac0 and &gmac1 respectively so aliases (ethernet0, ethernet1, mmc0,
serial0) consistently use direct phandle references to gmac0, gmac1, sdmmc, and
uart0.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: fffa789e-5cfc-4e20-a7d0-e467bceec802

📥 Commits

Reviewing files that changed from the base of the PR and between addbce1 and ab6cba8.

📒 Files selected for processing (4)

• config/boards/ebyte-ecb41-pge.csc
• patch/u-boot/u-boot-rk3506/defconfig/ebyte-ecb41-pge_defconfig
• patch/u-boot/u-boot-rk3506/dt/rk3506g-ebyte-ecb41-pge-u-boot.dtsi
• patch/u-boot/u-boot-rk3506/dt/rk3506g-ebyte-ecb41-pge.dts