DC_NETCFG_FULLDUPLEX
DC_SETBIT(sc, DC_NETCFG, DC_NETCFG_FULLDUPLEX);
DC_CLRBIT(sc, DC_NETCFG, DC_NETCFG_FULLDUPLEX);
mode &= ~(DC_NETCFG_FULLDUPLEX|DC_NETCFG_PORTSEL|
mode |= DC_NETCFG_FULLDUPLEX;
mode &= ~DC_NETCFG_FULLDUPLEX;
mode |= DC_NETCFG_FULLDUPLEX;
mode &= ~DC_NETCFG_FULLDUPLEX;
if (CSR_READ_4(dc_sc, DC_NETCFG) & DC_NETCFG_FULLDUPLEX)
DC_SETBIT(sc, DC_NETCFG, DC_NETCFG_FULLDUPLEX);