mii_{read|write}reg. This function is called twie.
To identify PHY type, correct read/write function should be selected. To
select correct read/write function, PCI ID or MAC type are required without
accessing PHY registers.
On the first call of this function, PHY ID is not known yet. Check PCI ID or
MAC type. The list of the PCI ID may not be perfect, so the result might be
incorrect.
In the second call, PHY OUI and model are used to identify PHY type. It might
not be perfpect because of the lack of compared entry, but it would be better
than the first call.
If the detected new result and previous assumption is different, diagnous
message will be printed.
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