fwdma_v_addr
db_tr->db = (struct fwohcidb *)fwdma_v_addr(dbch->am, idb);
db_tr->buf = (char*)fwdma_v_addr(ir->buf, idb);
db_tr->buf = (char*)fwdma_v_addr(it->buf, poffset);
fp = (struct fw_pkt *)fwdma_v_addr(ir->buf,
fp = (struct fw_pkt *)fwdma_v_addr(it->buf,