root@OpenWrt:/usr/sbin# mii-diag -v eth0
mii-diag.c:v2.11 3/21/2005 Donald Becker (becker@scyld.com)
 http://www.scyld.com/diag/index.html
  Using the new SIOCGMIIPHY value on PHY 0 (BMCR 0x0000).
 Basic mode control register 0x2100: Auto-negotiation disabled, with
 Speed fixed at 100 mbps, full-duplex.
 You have link beat, and everything is working OK.
   This transceiver is capable of  100baseTx-FD 10baseT.
   Unable to perform Auto-negotiation, negotiation not complete.
 Link partner information is not exchanged when in fixed speed mode.
   End of basic transceiver information.

 MII PHY #0 transceiver registers:
   2100 4804 0000 0000 0000 0000 0000 ffff
   ffff ffff ffff ffff ffff ffff ffff ffff
   ffff ffff ffff ffff ffff ffff ffff ffff
   ffff ffff ffff ffff ffff ffff ffff ffff