diff --cc hw/intc/openpic.c
index a26c641,5777ece..0000000
--- a/hw/intc/openpic.c
+++ b/hw/intc/openpic.c
@@@ -1527,17 -1526,9 +1527,17 @@@ static void map_list(OpenPICState *opp
      }
  }
  
 -static int openpic_init(SysBusDevice *dev)
 +static void openpic_init(Object *obj)
  {
 -    OpenPICState *opp = FROM_SYSBUS(typeof (*opp), dev);
 +    OpenPICState *opp = OPENPIC(obj);
 +
-     memory_region_init(&opp->mem, "openpic", 0x40000);
++    memory_region_init(&opp->mem, NULL, "openpic", 0x40000);
 +}
 +
 +static void openpic_realize(DeviceState *dev, Error **errp)
 +{
 +    SysBusDevice *d = SYS_BUS_DEVICE(dev);
 +    OpenPICState *opp = OPENPIC(dev);
      int i, j;
      int list_count = 0;
      static const MemReg list_le[] = {
diff --cc hw/ppc/mac_newworld.c
index 3badfa3,28d0f7e..0000000
--- a/hw/ppc/mac_newworld.c
+++ b/hw/ppc/mac_newworld.c
@@@ -289,13 -279,10 +289,13 @@@ static void ppc_core99_init(QEMUMachine
      /* Register 8 MB of ISA IO space */
      isa_mmio_init(0xf2000000, 0x00800000);
  
 -    /* UniN init */
 -    memory_region_init_io(unin_memory, NULL, &unin_ops, NULL, "unin", 0x1000);
 +    /* UniN init: XXX should be a real device */
-     memory_region_init_io(unin_memory, &unin_ops, token, "unin", 0x1000);
++    memory_region_init_io(unin_memory, NULL, &unin_ops, token, "unin", 0x1000);
      memory_region_add_subregion(get_system_memory(), 0xf8000000, unin_memory);
  
-     memory_region_init_io(unin2_memory, &unin_ops, token, "unin", 0x1000);
++    memory_region_init_io(unin2_memory, NULL, &unin_ops, token, "unin", 0x1000);
 +    memory_region_add_subregion(get_system_memory(), 0xf3000000, unin2_memory);
 +
      openpic_irqs = g_malloc0(smp_cpus * sizeof(qemu_irq *));
      openpic_irqs[0] =
          g_malloc0(smp_cpus * sizeof(qemu_irq) * OPENPIC_OUTPUT_NB);
diff --cc hw/ppc/mpc8544_guts.c
index d41f615,9d34fd5..0000000
--- a/hw/ppc/mpc8544_guts.c
+++ b/hw/ppc/mpc8544_guts.c
@@@ -114,14 -108,24 +114,14 @@@ static const MemoryRegionOps mpc8544_gu
      },
  };
  
 -static int mpc8544_guts_initfn(SysBusDevice *dev)
 +static void mpc8544_guts_initfn(Object *obj)
  {
 -    GutsState *s;
 -
 -    s = FROM_SYSBUS(GutsState, SYS_BUS_DEVICE(dev));
 +    SysBusDevice *d = SYS_BUS_DEVICE(obj);
 +    GutsState *s = MPC8544_GUTS(obj);
  
-     memory_region_init_io(&s->iomem, &mpc8544_guts_ops, s,
+     memory_region_init_io(&s->iomem, NULL, &mpc8544_guts_ops, s,
 -                          "mpc6544.guts", MPC8544_GUTS_MMIO_SIZE);
 -    sysbus_init_mmio(dev, &s->iomem);
 -
 -    return 0;
 -}
 -
 -static void mpc8544_guts_class_init(ObjectClass *klass, void *data)
 -{
 -    SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
 -
 -    k->init = mpc8544_guts_initfn;
 +                          "mpc8544.guts", MPC8544_GUTS_MMIO_SIZE);
 +    sysbus_init_mmio(d, &s->iomem);
  }
  
  static const TypeInfo mpc8544_guts_info = {
diff --git a/hw/misc/macio/macio.c b/hw/misc/macio/macio.c
index 787a4c7..5930ccd 100644
--- a/hw/misc/macio/macio.c
+++ b/hw/misc/macio/macio.c
@@ -104,11 +104,11 @@ static void macio_escc_legacy_setup(MacIOState *macio_state)
         0xF0, 0xE0,
     };
 
-    memory_region_init(escc_legacy, "escc-legacy", 256);
+    memory_region_init(escc_legacy, NULL, "escc-legacy", 256);
     for (i = 0; i < ARRAY_SIZE(maps); i += 2) {
         MemoryRegion *port = g_new(MemoryRegion, 1);
-        memory_region_init_alias(port, "escc-legacy-port", macio_state->escc_mem,
-                                 maps[i+1], 0x2);
+        memory_region_init_alias(port, NULL, "escc-legacy-port",
+                                 macio_state->escc_mem, maps[i + 1], 0x2);
         memory_region_add_subregion(escc_legacy, maps[i], port);
     }