/* * http://cesdis.gsfc.nasa.gov/linux/misc/100mbps.html has this to say: * * TDK Semiconductor (formerly Silicon Systems) 78Q2120 (10/100) and 78Q2121 * (100Mbps only) MII transceivers. The first PHY available which worked at * both 5.0 and 3.3V. Used on the 3Com 3c574 and Ositech products. The OUI * is 00:c0:39, models 20 and 21. Warning: The older revision 3 part has * several bugs. It always responds to MDIO address 0, and has clear-only * semantics for the capability-advertise registers. The current (3/99) * revision 11 part, shipping since 8/98, has reportedly fixed these problems. */