МИХАИЛ

i fixed meson-sm1-hk1box-vontar-x3.dtb for hk1box-LAN100m
I'm cleaning up the ethernet@ff3f0000 - everything related to the  external chip:
ethernet@ff3f0000 { compatible = "amlogic,meson-g12a-dwmac\0snps,dwmac-3.70a\0snps,dwmac"; reg = <0x00 0xff3f0000 0x00 0x10000 0x00 0xff634540 0x00 0x08>; interrupts = <0x00 0x08 0x04>; interrupt-names = "macirq"; clocks = <0x02 0x26 0x02 0x02 0x02 0x0d 0x02 0x02>; clock-names = "stmmaceth\0clkin0\0clkin1\0timing-adjustment"; rx-fifo-depth = <0x1000>; tx-fifo-depth = <0x800>; status = "okay"; power-domains = <0x03 0x06>; pinctrl-0 = <0x11 0x12>; pinctrl-names = "default"; phy-handle = <0xe4>; #(there was a link at <0x13> to the external chip) phy-mode = "rmii"; # I remove the letter "g" since we have 100 M/s nvmem-cells = <0x14>; nvmem-cell-names = "eth_mac"; phandle = <0x5f>; mdio { #address-cells = <0x01>; #size-cells = <0x00>; compatible = "snps,dwmac-mdio"; phandle = <0x1d>; }; };  
Here we also remove the  external ethernet chip
mdio@0 { reg = <0x00>; #address-cells = <0x01>; #size-cells = <0x00>; phandle = <0xe2>; #ethernet-phy@0 { # reg = <0x00>; # max-speed = <0x3e8>; # reset-assert-us = <0x7530>; #reset-deassert-us = <0x13880>; #reset-gpios = <0x1e 0x0f 0x07>; #interrupt-parent = <0x1f>; #interrupts = <0x1a 0x08>; #phandle = <0x13>; - In the code above there was a link to here to the external chip ethernet #}; }; mdio@1 { reg = <0x01>; #address-cells = <0x01>; #size-cells = <0x00>; phandle = <0xe3>; ethernet_phy@8 { compatible = "ethernet-phy-id0180.3301\0ethernet-phy-ieee802.3-c22"; interrupts = <0x00 0x09 0x04>; reg = <0x08>; max-speed = <0x64>; phandle = <0xe4>; - # in the code above, I changed the link to this part internal ethernet }; };  
You can check my DTB and add for HK1box-LAN100m to the armbian build
meson-sm1-hk1box.dtb.zip