NOP_SIZE
ether1_writebuffer (dev, &init_nop, NOP_ADDR, NOP_SIZE);
priv(dev)->tx_head = NOP_ADDR + NOP_SIZE;
nopaddr = ether1_txalloc (dev, NOP_SIZE);
ether1_writebuffer (dev, &nop, nopaddr, NOP_SIZE);
tst = ether1_txalloc (dev, TX_SIZE + TBD_SIZE + NOP_SIZE + ETH_FRAME_LEN);
ether1_readbuffer (dev, &nop, caddr, NOP_SIZE);
ether1_readbuffer (dev, &nop, caddr, NOP_SIZE);
ether1_readbuffer (dev, &nop, caddr, NOP_SIZE);
tst = ether1_txalloc (dev, TX_SIZE + TBD_SIZE + NOP_SIZE + ETH_FRAME_LEN);