0x03000030 points to ephy register which H6 specification does not mention. Refer to kernel/drivers/net/phy/sunxi-ephy.c kernel/drivers/mfd/acx00-core.c and kernel/arch/arm64/boot/dts/sun50iw6p1.dtsi, if you can find linux 3.10.65 from allwinner.
Ethernet don't work with linux 4.19 because of missing phy driver. My boss make me to give it up, cause wasting a lot of time. So, I have no time to transplant phy driver to linux 4.19.
You can refer to H6 spercs 3.20 ATE(audio codec, tve, ephy) controller、8.8 emac and 8.13 ephy setions from Allwinner_H6 V200_User_Manual_V1.1.pdf
Looking forward to you work
Allwinner_H6 V200_User_Manual_V1.1.pdf
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