CSR4
lance->RAP = CSR4; /* Test and Features Control */
lp->a->write_csr(ioaddr, CSR4, 0x0915); /* auto tx pad */
lp->a->write_csr(ioaddr, CSR4, 0x0915); /* auto tx pad */
lp->a->write_csr(ioaddr, CSR4, 0x0915); /* auto tx pad */
iowrite32(tp->tx_ring_dma, ioaddr + CSR4);
xw32(CSR4, address); /* xmit descr list address */
xw32(CSR4, val); /* Send descriptor address */