vnic attaches. The relevant portions of the FDT look like this:
```
bgx0 {
#address-cells = <0x1>;
#size-cells = <0x0>;
reg = <0x8000 0x0 0x0 0x0 0x0>;
xfi@0 {
reg = <0x0>;
local-mac-address = [fc 15 b4 97 48 b7];
phy-handle = <0x75>;
};
xfi@1 {
reg = <0x1>;
local-mac-address = [fc 15 b4 97 48 b8];
phy-handle = <0x76>;
};
};
...
mdio@87e005003800 {
compatible = "cavium,thunder-8890-mdio";
#address-cells = <0x1>;
#size-cells = <0x0>;
reg = <0x87e0 0x5003800 0x0 0x30>;
xfi@0 {
reg = <0x0>;
compatible = "cortina,cs4223-slice";
linux,phandle = <0x75>;
phandle = <0x75>;
};
xfi@1 {
reg = <0x1>;
compatible = "cortina,cs4223-slice";
linux,phandle = <0x76>;
phandle = <0x76>;
};
};
```