aau_desc_8
struct aau_desc_8 **prevp, *cur;
prevp = (struct aau_desc_8 **) &sc->sc_firstdesc;
iopaau_desc_8_cache = pool_cache_init(sizeof(struct aau_desc_8),
(ninputs > 4) ? sizeof(struct aau_desc_8) : \
struct aau_desc_8 *d_next; /* pointer to next (va) */