Detection of successful autonegotiation is not properly implemented

The stack currently does this:

if( tConnectionState.fIsLinkUp )
{ /* link is up */

  ulStatusFlags |= 0x01;   /* set flag "link up" */

  if (tConnectionState.fIsFullDuplex)
  {
    ulStatusFlags |= 0x02;   /* set flag "Full Duplex"          */
    ulStatusFlags |= 0x0C;   /* set flag "auto neg successful"  */
  }
  else
  {
    ulStatusFlags |= 0x08;   /* set flag "auto neg failed but detected speed" */
  }
}

Which of course fails for fixed duplex mode 100 MBit/s full.
We need access to more PHY status information from within the stack (2PS/STDMAC needs adaption).