TxRingPtr
outl(virt_to_bus(&txd), ioaddr + TxRingPtr);
inl(ioaddr + TxRingPtr));
outl(virt_to_bus(&txd), ioaddr + TxRingPtr);
inl(ioaddr + TxRingPtr));
writel(virt_to_bus(w840private.tx_ring), ioaddr + TxRingPtr);