I have problems getting my SonicVibes (sys/dev/pci/sv.c) to run. While it is a
PCI card it is not capable of DMA from/to memory above 16M (24bit).

Is there a legal way to use a function like `_bus_dmamem_alloc_range' in a
PCI driver or is it possible to use another dma_tag with this capabilities?

The code in question is (sys/dev/pci/sv.c):

   380  #ifdef alpha
   381          /* XXX Force allocation through the SGMAP. */
   382          sc->sc_dmatag = alphabus_dma_get_tag(pa->pa_dmat, ALPHA_BUS_ISA);
   383  #else
   384          sc->sc_dmatag = pa->pa_dmat;
   385  #endif

   524          error = bus_dmamem_alloc(sc->sc_dmatag, p->size, align, 0,
   525                                   p->segs, ARRAY_SIZE(p->segs),
   526                                   &p->nsegs, BUS_DMA_NOWAIT);
   527          if (error)
   528                  return (error);
   529  
   530          error = bus_dmamem_map(sc->sc_dmatag, p->segs, p->nsegs, p->size, 
   531                                 &p->addr, BUS_DMA_NOWAIT|BUS_DMA_COHERENT);
   532          if (error)
   533                  goto free;
   534  
   535          error = bus_dmamap_create(sc->sc_dmatag, p->size, 1, p->size,
   536                                    0, BUS_DMA_NOWAIT, &p->map);
   537          if (error)
   538                  goto unmap;
   539  
   540          error = bus_dmamap_load(sc->sc_dmatag, p->map, p->addr, p->size, NULL, 
   541                                  BUS_DMA_NOWAIT |
   542                                  (direction == AUMODE_RECORD) ? BUS_DMA_READ : BUS_DMA_WRITE)
;
-- 
Juergen Hannken-Illjes - hannken@eis.cs.tu-bs.de - TU Braunschweig (Germany)