find_component
extern klinfo_t *find_component(lboard_t *brd, klinfo_t *kli, unsigned char type);
return find_component(brd, (klinfo_t *)NULL, struct_type);
acpu = (klcpu_t *)find_component(brd, (klinfo_t *)acpu,
xbow_p = (klxbow_t *)find_component(brd, NULL, KLSTRUCT_XBOW);
c = find_component(adev, mc);