-CURRENT and -STABLE fails on IBM R30 in agp_ali.c

Hello,

there is a problem in ali_agp.c (both, -CURRENT and -STABLE): If I
boot the generic kernel, it panics in agp_ali.c, when it tries to
allocate memory for the gatt. Some simlpe tests showed, that the
initial aperture size is reported as zero by the device:

  static int
  agp_ali_attach(device_t dev)
  {
	  struct agp_ali_softc *sc = device_get_softc(dev);
	  struct agp_gatt *gatt;
	  int error;
  
	  error = agp_generic_attach(dev);
	  if (error)
		  return error;
  
	  sc->initial_aperture = AGP_GET_APERTURE(dev);

This is zero---------------------^^^^^^
  
	  for (;;) {
		  gatt = agp_alloc_gatt(dev);
		  if (gatt)
			  break;
  
		  /*
		   * Probably contigmalloc failure. Try reducing the
		   * aperture so that the gatt size reduces.
		   */
		  if (AGP_SET_APERTURE(dev, AGP_GET_APERTURE(dev) / 2)) {
			  agp_generic_detach(dev);
			  return ENOMEM;
		  }
	  }
	  sc->gatt = gatt;
  
	  /* Install the gatt. */

Since I don't have a machine ready running -CURRENT, I can't really
debug this. How can I disable agp0 on boot time?

Björn Fischer

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