DownListPtr
iowrite32(0, ioaddr + DownListPtr);
if (vp->cur_tx - vp->dirty_tx > 0 && ioread32(ioaddr + DownListPtr) == 0)
ioaddr + DownListPtr);
if (ioread32(ioaddr + DownListPtr) == 0) {
iowrite32(vp->tx_ring_dma + entry * sizeof(struct boom_tx_desc), ioaddr + DownListPtr);
if (ioread32(ioaddr + DownListPtr) ==
iowrite32(0, ioaddr + DownListPtr);
ioread32(ioaddr + DownListPtr),