BMCR
u16 BMCR;
velocity_mii_read(vptr->mac_regs, MII_BMCR, &BMCR);
if (BMCR & BMCR_ISOLATE) {
BMCR &= ~BMCR_ISOLATE;
velocity_mii_write(vptr->mac_regs, MII_BMCR, BMCR);
get_registers(dev, BMCR, 2, &bmcr);