rockchip: Add CSC board ForLinx OK3506-S12 (RK3506J)

[vidplace7]

Description

Adds new RK3506J CSC board ForLinx OK3506-S12.
This PR also includes uboot patches (dts/defconfig) to enable this board.

This board uses 0.45W at idle (0.36W with Ethernet disabled). 🌞

Depends on:

• arch: arm: dts: add ForLinx OK3506-S12 (RK3506J) linux-rockchip#446

How Has This Been Tested?

• ./compile.sh BOARD=forlinx-ok3506-s12 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=forlinx-ok3506-s12 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

[coderabbitai]

📝 Walkthrough

Walkthrough

Adds comprehensive support for the Forlinx OK3506-S12 board (RK3506-based SoC) by introducing board configuration, U-Boot build settings, patching directives, and device tree definitions across five new files totaling 319 lines.

Changes

Cohort / File(s)	Summary
Board Configuration config/boards/forlinx-ok3506-s12.csc	Defines board identity, vendor, family, boot configuration, maintainer, kernel target, DTB file, partition table, serial console settings, SoC type, and DDR blob for the RK3506-based platform.
U-Boot Build System patch/u-boot/u-boot-rk3506/0000.patching_config.yaml	Establishes overlay mappings for patching: defconfig→configs and dt→arch/arm/dts directories.
U-Boot Configuration patch/u-boot/u-boot-rk3506/defconfig/forlinx-ok3506-s12-rk3506j_defconfig	Provides comprehensive U-Boot defconfig enabling RK3506 architecture, device tree support, boot/serial parameters, storage (MMC/MTD/USB), networking (Ethernet/MDIO), USB gadget, GPIO, LED, SFC, and rockchip-specific drivers with UART baud rate set to 1500000.
Device Trees patch/u-boot/u-boot-rk3506/dt/rk3506j-forlinx-ok3506-s12-u-boot.dtsi, patch/u-boot/u-boot-rk3506/dt/rk3506j-forlinx-ok3506-s12.dts	U-Boot device tree fragment defining boot-phase designations for SPI flash and SD/MMC; main DTS file defining board metadata, power regulators, Ethernet (gmac0/gmac1), pinctrl mappings, UART, USB OTG, SD/MMC, ADC keys, and voltage rails.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Poem

🐰 A new board hops into view,
RK3506 dreams come true,
Config files all neat and clean,
The finest board we've ever seen!
Device trees bloom like spring grass,
Forlinx folks will have a blast! 🌱

🚥 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 clearly and concisely summarizes the main change: adding support for a specific board (ForLinx OK3506-S12) to the Rockchip platform.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing touches

🧪 Generate unit tests (beta)

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

---

No actionable comments were generated in the recent review. 🎉

🧹 Recent nitpick comments

patch/u-boot/u-boot-rk3506/dt/rk3506j-forlinx-ok3506-s12.dts (1)

13-18: Inconsistent alias value syntax: phandle vs. path reference.

Lines 14–15 use <&label> (phandle encoding) while lines 16–17 use &label (path reference). In the aliases node, values should be path references (strings). While modern dtc tolerates both, the canonical form for aliases is without angle brackets.

♻️ Suggested fix for consistency

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

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[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 forlinx-ok3506-s12

  • Expected: board-images/forlinx-ok3506-s12.png
  • Fix: add the file to armbian/armbian.github.io (folder board-images/)

• ❌ Vendor logo missing for vendor forlinx (used by board forlinx-ok3506-s12)

  • Expected: board-vendor-logos/forlinx-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.

[github-actions]

✅ This PR has been reviewed and approved — all set for merge!