xyc_chain
iopb = xyc_chain(xycsc, iorq); /* build chain */
struct xy_iopb *xyc_chain(struct xyc_softc *, struct xy_iorq *);
struct xy_iopb *xyc_chain(struct xyc_softc *, struct xy_iorq *);
dmaiopb = xyc_chain(xycsc, iorq); /* build chain */