This was a bug in armbian-config ... fixed with https://github.com/armbian/configng/pull/299

Javad, Have patched your u-boot? You need these three patch files. https://github.com/NickAlilovhttps://github.com/NickAlilovic/build/blob/v20241125/patch/u-boot/u-boot-sunxi/106-Add-int-phy-eth-H313-h616-with-AC300.patch https://github.com/NickAlilovic/build/blob/v20241125/patch/u-boot/u-boot-sunxi/106-Add-int-phy-eth-H313-h616-with-AC300.patch https://github.com/NickAlilovic/build/blob/v20241125/patch/u-boot/u-boot-sunxi/dts-Transpeed-8K618-T-Enable-Ethernet.patch Kernel you need https://github.com/NickAlilovic/build/blob/v20241125/patch/kernel/archive/sunxi-6.10/patches.armbian/arm64-dts-allwinner-h618-add-Transpeed-8K618-T-support.patch You need this in your DTS plus those two u-boot patches. The last two patches adds this to your u-boot and kernel DTS. aliases { ethernet0 = &emac1; ethernet1 = &sdio_wifi; serial0 = &uart0; }; &emac1 { pinctrl-names = "default"; pinctrl-0 = <&rmii_pins>; phy-mode = "rmii"; phy-handle = <&rmii_phy>; phy-supply = <&reg_aldo1>; allwinner,rx-delay-ps = <3100>; allwinner,tx-delay-ps = <700>; status = "okay"; }; &mdio1 { rmii_phy: ethernet-phy@0 { compatible = "ethernet-phy-ieee802.3-c22"; reg = <0>; }; }; You already have the EPHY 200 patched in your kernel. You have to edit your kernel config to enable it. # # MII PHY device drivers # CONFIG_AC200_PHY=m # # Multifunction device drivers # CONFIG_MFD_AC200=m # # PHY Subsystem # CONFIG_AC200_PHY_CTL=m

Note that for the NanoPi R6C it is correct. Although lan2 could be removed because PCI-E 0004 node contains my NVME SSD. EDIT: I see https://github.com/armbian/build/blob/main/config/boards/nanopi-r6c.csc is correct, no lan2. It is just that on my installation the rules file is not updated. It is from image older than a year.

There is a patch. It doesn't appear to have reached mainline yet. Perhaps it could be added to Armbian builds. You probably want to go back to your original, working, kernel.

Current Kernel is Linux 6.1.75-vendor-rk35xx #1 SMP Tue Nov 12 08:48:32 UTC 2024 aarch64 GNU/Linux