EthCtrl0
pegasus->eth_regs[EthCtrl0] |= RX_MULTICAST;
pegasus->eth_regs[EthCtrl0] &= ~RX_MULTICAST;
req->wIndex = cpu_to_le16(EthCtrl0);
ret = set_registers(pegasus, EthCtrl0, 3, data);
set_registers(pegasus, EthCtrl0, sizeof(tmp), &tmp);