BMCR_S100
PHY_WRITE(sc, MII_BMCR, (BMCR_S100 | BMCR_AUTOEN | BMCR_FDX));
bmcr = BMCR_S100;
PHY_WRITE(sc, MII_BMCR, BMCR_S100|BMCR_AUTOEN|BMCR_FDX);
#define BMCR_SPEED(x) ((x) & (BMCR_S1000 | BMCR_S100))
[MII_MEDIA_100_T4] = { .mm_bmcr = BMCR_S100,
[MII_MEDIA_100_TX] = { .mm_bmcr = BMCR_S100,
[MII_MEDIA_100_TX_FDX] = { .mm_bmcr = BMCR_S100 | BMCR_FDX,
BMCR_LOOP|BMCR_S100);