Add board: EASY EAI Nano RV1126

[hqnicolas]

Add initial Armbian support for the EASY-EAI Nano RV1126 board.

Forum topic:
https://forum.armbian.com/topic/60848-board-bring-up-easy-eai-nano-rv1126/

Introducing a new CSC board target for Rockchip RV1126 using the vendor 6.1 Rockchip kernel branch and Radxa/Rockchip U-Boot 2017.09. The board is an RV1126-based module with 2 GB DDR3, onboard eMMC, SD-card boot support.

• Add EASY-EAI Nano RV1126 board configuration.
• Add RV1126 family support for Armbian build.
• Add RV1126 U-Boot build path using Radxa/Rockchip U-Boot.

How Has This Been Tested?

• Built U-Boot artifact for BOARD=easy-eai-nano BRANCH=vendor.
• Booted from SD card on EASY-EAI Nano RV1126 hardware.
• Confirmed boot reaches Armbian.
• Full eMMC boot from raw image still needs final hardware validation.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• My changes generate no new warnings in the tested U-Boot build path
• Any dependent changes have been merged and published in downstream modules

<!-- This is an auto-generated comment: release notes by coderabbit.ai -->

## Summary by CodeRabbit

* **New Features**
  * Added support for the EASY-EAI Nano RV1126 board, including a new boot flow and board-specific hardware configuration.
  * Introduced display, camera, touch, storage, and network support for the new platform.
  * Added RV1126-specific U-Boot and kernel boot assets for improved startup and device initialization.

* **Bug Fixes**
  * Improved boot reliability with fallback handling for boot scripts, device tree loading, and kernel initramfs.
  * Refined boot parameters for better device behavior and quieter startup output.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

[coderabbitai]

📝 Walkthrough

Walkthrough

This PR adds full board support for the Rockchip RV1126-based "EASY-EAI Nano" board: Armbian board/family configuration files, boot environment and U-Boot boot script, kernel device tree patches (including a display panel dtsi), and U-Boot legacy patches with a new defconfig, DTB registration, and boot command changes.

Changes

EASY-EAI Nano RV1126 Board Bring-up

Layer / File(s)	Summary
Board metadata and kernel config hook config/boards/easy-eai-nano.csc	Defines board identity/boot variables and a vendor-branch kernel config hook appending RV1126-specific options.
Boot environment and boot script config/bootenv/rv1126.txt, config/bootscripts/boot-rv1126.cmd	Sets boot verbosity/extraargs/bootlogo defaults and adds a U-Boot script for env import, PARTUUID rewrite, bootargs construction, and kernel/initramfs/DTB loading with fallback.
Rockchip RV1126 family configuration config/sources/families/rockchip-rv1126.conf	Adds SoC defaults, RKbin blob paths, GCC warning downgrade, IDB/FIT image generation via boot_merger, disk-offset writing, and filesystem tweaks (groups, udev rules, asound.conf).
Kernel patching config and RV1126 Nano device tree patch/kernel/rv1126-vendor-6.1/0000.patching_config.yaml, patch/kernel/rv1126-vendor-6.1/dt/rv1126-nano.dts	Adds vendor kernel patching config and the board DTS enabling camera/CSI, touch, SPI, I2S, CAN, ethernet, SDMMC, and pinctrl peripherals.
LCD display panel device tree include patch/kernel/rv1126-vendor-6.1/dt/lmo-display.dtsi	Adds DSI panel configuration, per-panel init/exit command sequences, and display timing definitions.
U-Boot DTB Makefile and device tree patch/u-boot/legacy/u-boot-rockchip-buildroot/add-easy-eai-nano-rv1126-dtb.patch, patch/u-boot/legacy/u-boot-rockchip-buildroot/dt/rv1126-easy-eai-nano.dts	Registers the new DTB in the Makefile and adds a minimal U-Boot SPL device tree for eMMC/uart2 boot.
U-Boot defconfig and boot command patch patch/u-boot/legacy/u-boot-rockchip-buildroot/defconfig/easy-eai-nano-rv1126_defconfig, patch/u-boot/legacy/u-boot-rockchip-buildroot/rv1126-bootscr.patch	Adds full U-Boot defconfig for SPL/FIT/storage/network/display and patches RKIMG_BOOTCOMMAND to load/source boot.scr from eMMC/SD.

Estimated code review effort: 4 (Complex) | ~60 minutes

Sequence Diagram(s)

sequenceDiagram
  participant UBoot as boot-rv1126.cmd
  participant MMC as MMC/SD Partition
  participant Kernel as zImage/uInitrd/DTB

  UBoot->>MMC: load and import armbianEnv.txt
  UBoot->>UBoot: compute PARTUUID, build bootargs
  UBoot->>MMC: load uInitrd
  UBoot->>MMC: load zImage
  UBoot->>MMC: load fdtfile (fallback on failure)
  UBoot->>Kernel: bootz kernel_addr_r ramdisk_arg fdt_addr_r

Loading

sequenceDiagram
  participant SPL as U-Boot SPL
  participant EMMC as mmc dev 0
  participant SD as mmc dev 1
  participant Script as boot.scr

  SPL->>EMMC: load boot.scr
  EMMC-->>SPL: success or failure
  SPL->>SD: load boot.scr (if EMMC failed)
  SD-->>SPL: success or failure
  SPL->>Script: source boot.scr

Loading

Suggested labels: BSP

Suggested reviewers: amazingfate, igorpecovnik, chainsx, joekhoobyar, ahoneybun, catalinii, brentr, paolosabatino

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title is concise and accurately summarizes the main change: adding EASY-EAI Nano RV1126 board support.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[EvilOlaf]

no. this will produce a non-standard rk35xx-vendor kernel image which collides with the standard ones, breaking apt repo.