sca_outw
sca_outw(desc_offset(port, 0, transmit), dmac + CDAL, card);
sca_outw(desc_offset(port, buffs - 1, transmit),
sca_outw(desc_offset(port, 0, transmit), dmac + EDAL,
sca_outw(HDLC_MAX_MRU, dmac + BFLL, card);
sca_outw(desc_off, dmac + EDAL, card);
sca_outw(desc_offset(port, port->txin, 1),
sca_outw(HDLC_MAX_MRU, dmac_rx + BFLL, card); /* set buffer length */