PCS_MII_ISOLATE  1810 drivers/net/ethernet/sun/cassini.h #define    PCS_MII_ISOLATE                 0x0400 /* read as 0. ignored
PCS_MII_ISOLATE   695 drivers/net/ethernet/sun/niu.h #define  PCS_MII_ISOLATE		0x0000000000000400ULL