Bigtreetech CB2: bump u-boot to 2026.04

[JohnTheCoolingFan]

Description

Bumps bigtreetech cb2 u-boot to v2026.04, adapted to use upstream dts. defconfig updated using make oldconfig and dt changed to use upstream.

How Has This Been Tested?

• Build and boot trixie image with current kernel
• Check ethernet, wifi, dmesg

Checklist:

• My code follows the style guidelines of this project
• 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 BigTreeTech CB2 on Rockchip RK3566 with a new boot configuration.
  • Enabled broader boot and recovery capabilities, including network, USB, MMC, SPI flash, fastboot, and NVMe support.
• Changes
  • Updated the board boot setup to use a newer boot flow and U-Boot version settings.
  • Disabled boot delay for faster startup.

[coderabbitai]

📝 Walkthrough

Walkthrough

Updates the bigtreetech-cb2 board configuration to use the binman boot scenario and U-Boot v2026.04 sourcing, removing legacy custom blob/helper code from the overrides function, and adds a new bigtreetech-cb2-rk3566_defconfig file for U-Boot v2026.04.

Changes

bigtreetech-cb2 U-Boot binman migration

Layer / File(s)	Summary
Board config: boot scenario and U-Boot version update config/boards/bigtreetech-cb2.conf	BOOT_SCENARIO switched from spl-blobs to binman; BOOTBRANCH/BOOTPATCHDIR updated to v2026.04; legacy blob variables and write_uboot_platform*/unset helper code removed from the overrides function.
New v2026.04 defconfig patch/u-boot/v2026.04/defconfig/bigtreetech-cb2-rk3566_defconfig	New defconfig for Rockchip rk3566 with SPL/FIT/bootz setup, GPT/MMC/PCI/USB/TFTP commands, fastboot, storage (MMC, SPI NOR), and networking (DWC Ethernet QoS, PCIe, USB, NVMe) support.

Estimated code review effort: 2 (Simple) | ~10 minutes

Possibly related PRs

• armbian/build#9869: Similar U-Boot sourcing metadata update (BOOTBRANCH/BOOTPATCHDIR to v2026.04) for another Rockchip board.
• armbian/build#10013: Same-pattern board .conf update to v2026.04 BOOTBRANCH/BOOTPATCHDIR.
• armbian/build#10071: Same post_family_config__... BOOTBRANCH/BOOTPATCHDIR update pattern to a newer U-Boot tag.

Suggested reviewers: amazingfate, paolosabatino, igorpecovnik, HeyMeco, prahal

🚥 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 clearly and concisely summarizes the main change: upgrading Bigtreetech CB2 U-Boot to 2026.04.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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