RFEN
outl(rfcrSave & ~RFEN, rfcr + ioaddr);
outl(rfcrSave | RFEN, rfcr + ioaddr);
outl(rfcrSave & ~RFEN, rfcr + ioaddr);
outl(rfcrSave | RFEN, rfcr + ioaddr);
outl(RFEN | rx_mode, ioaddr + rfcr);