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Thanks for the info and the PR link. So the fix is in the works but not merged yet — any idea how long it might take to land in nightlies or mainline? Should I keep the thread open until then, or just close it and reopen if needed after testing? Thanks again.

Ach, OK. On Banana Pi M4 Zero (H618), the Ethernet PHY is integrated into the SoC, specifically within the AC200 block. There is no external Ethernet PHY chip like RTL8211F — the EMAC1 interface uses RMII and talks directly to the internal PHY. The issue I’m facing is likely due to incompatibility with kernel 6.x.x. I haven’t been able to get any overlay to work properly. However, with a kernel from the 5.4.x series, Ethernet works out-of-the-box on the same hardware. Any insights on proper overlay structure or required patches for AC200 support in newer kernels would be highly appreciated. Thanks for your help!

It is Allwinner H618, Quad-core ARM Cortex™-A53 processor. Yes it is external USB network card, which I used just to be able to send logs made via armbianmonitor to the internet. The state You see in the logs is just latest stage of many different attempts: with custom overlays and/or fixes on the sun50i-h618-bananapi-m4-zero.dtb (decompile, fix, compile, boot). In addition have tried some patches using H616 files. I also found problem is due to, PHY isn't properly powered on, based on topic: https://github.com/armbian/build/pull/6617 but after plenty of tries didnt manage to make it work ;(

armbianmonitor logs: https://paste.armbian.com/rolisaboru I’m running Armbian 25.2 on a Banana Pi BPI-M4-Zero (Allwinner sun50i-h618). EMAC1 (ethernet@5030000) with its internal PHY never comes up: sunxi-gmac 5030000.ethernet end0: renamed from eth0 … No PHY found! … phy init again… No PHY found! … phy init failed So far I have tried: 1. Directly patching full.dts Enabled /soc/ethernet@5030000 (status = “okay”) Added phy-mode = "rmii", pinctrl-0 = <&rmii_pins>, phy-handle, phy-supply etc. Defined a simple ethernet-phy@0 under MDIO. Recompiled to sun50i-h618-bananapi-m4-zero.dtb and rebooted. 2. User overlay (.dts → .dtbo) Created fragments to: Turn on /soc/ethernet@5030000/mdio Inject an ethernet-phy@0 node Enable EMAC1, assign RMII pins, MDIO and PHY handle Compiled with dtc -@ and loaded via user_overlays=bpi-m4z-eth in armbianEnv.txt. 3. Following Armbian build PR #6617 Tried the patch for H618’s internal AC300 PHY from https://github.com/armbian/build/pull/6617 No change: PHY still not detected, no power-up. 4. Troubleshooting notes Overlay apply errors: FDT_ERR_NOTFOUND dtc compile errors on duplicate or missing phandle references Verified pinctrl entries (rmii-pins) and alias names match base DTS I’ve collected a full hardware/software report via armbianmonitor—see the logs here: https://paste.armbian.com/rolisaboru What I’m looking for A known-good snippet of device-tree (base DTS or overlay) that brings up the internal EMAC1 PHY on sun50i-h618 Advice on any missing power-or-clock settings or MFD nodes required for the AC300 PHY Confirmation whether additional kernel/config patches are needed Thanks in advance for any pointers!