NAME

     mdio — IEEE 802.3 Management Data Input/Output interface

SYNOPSIS

     To compile this driver into the kernel, place the following line in your kernel
     configuration file:

           device mdio

DESCRIPTION

     The mdio driver provides an interconnection between the Media Access Control (MAC) sublayer
     and Physical Layer (PHY) entities' control and status registers, as defined by the IEEE
     802.3 Standard.

     The mdio layer allows device drivers to share common support code for various external PHY
     devices.

     MDIO is one of two signal interfaces that comprise the Media Independent Interface (MII)
     defined by the IEEE 802.3 Standard.  The miibus(4) driver provides support for devices that
     require full MII support.

SEE ALSO

     miibus(4)

STANDARDS

     More information on MDIO can be found in the IEEE 802.3 Standard.

HISTORY

     The mdio driver first appeared in FreeBSD 10.0.

AUTHORS

     The driver was written by Stefan Bethke <stb@lassitu.de>.