diff --git a/hw/mac_nvram.c b/hw/mac_nvram.c
index 0a22e66..a832dda 100644
--- a/hw/mac_nvram.c
+++ b/hw/mac_nvram.c
@@ -37,13 +37,6 @@
 #define NVR_DPRINTF(fmt, ...)
 #endif
 
-struct MacIONVRAMState {
-    uint32_t size;
-    MemoryRegion mem;
-    unsigned int it_shift;
-    uint8_t *data;
-};
-
 #define DEF_SYSTEM_SIZE 0xc10
 
 /* Direct access to NVRAM */
@@ -111,32 +104,50 @@ static const VMStateDescription vmstate_macio_nvram = {
 };
 
 
-static void macio_nvram_reset(void *opaque)
+static void macio_nvram_reset(DeviceState *dev)
 {
 }
 
-MacIONVRAMState *macio_nvram_init (hwaddr size,
-                                   unsigned int it_shift)
+static int macio_nvram_initfn(SysBusDevice *d)
 {
-    MacIONVRAMState *s;
+    MacIONVRAMState *s = MACIO_NVRAM(d);
 
-    s = g_malloc0(sizeof(MacIONVRAMState));
-    s->data = g_malloc0(size);
-    s->size = size;
-    s->it_shift = it_shift;
+    s->data = g_malloc0(s->size);
 
     memory_region_init_io(&s->mem, &macio_nvram_ops, s, "macio-nvram",
-                          size << it_shift);
-    vmstate_register(NULL, -1, &vmstate_macio_nvram, s);
-    qemu_register_reset(macio_nvram_reset, s);
+                          s->size << s->it_shift);
+    sysbus_init_mmio(d, &s->mem);
 
-    return s;
+    return 0;
 }
 
-void macio_nvram_setup_bar(MacIONVRAMState *s, MemoryRegion *bar,
-                           hwaddr mem_base)
+static Property macio_nvram_properties[] = {
+    DEFINE_PROP_UINT32("size", MacIONVRAMState, size, 0),
+    DEFINE_PROP_UINT32("it_shift", MacIONVRAMState, it_shift, 0),
+    DEFINE_PROP_END_OF_LIST()
+};
+
+static void macio_nvram_class_init(ObjectClass *oc, void *data)
 {
-    memory_region_add_subregion(bar, mem_base, &s->mem);
+    DeviceClass *dc = DEVICE_CLASS(oc);
+    SysBusDeviceClass *sdc = SYS_BUS_DEVICE_CLASS(oc);
+
+    sdc->init = macio_nvram_initfn;
+    dc->reset = macio_nvram_reset;
+    dc->vmsd = &vmstate_macio_nvram;
+    dc->props = macio_nvram_properties;
+}
+
+static const TypeInfo macio_nvram_type_info = {
+    .name = TYPE_MACIO_NVRAM,
+    .parent = TYPE_SYS_BUS_DEVICE,
+    .instance_size = sizeof(MacIONVRAMState),
+    .class_init = macio_nvram_class_init,
+};
+
+static void macio_nvram_register_types(void)
+{
+    type_register_static(&macio_nvram_type_info);
 }
 
 /* Set up a system OpenBIOS NVRAM partition */
@@ -175,3 +186,5 @@ void pmac_format_nvram_partition (MacIONVRAMState *nvr, int len)
     end = len;
     OpenBIOS_finish_partition(part_header, end - start);
 }
+
+type_init(macio_nvram_register_types)
diff --git a/hw/macio.c b/hw/macio.c
index 0e6fc8d..32f359c 100644
--- a/hw/macio.c
+++ b/hw/macio.c
@@ -41,11 +41,21 @@ typedef struct MacIOState
     MemoryRegion *dbdma_mem;
     MemoryRegion *cuda_mem;
     MemoryRegion *escc_mem;
-    void *nvram;
     int nb_ide;
     MemoryRegion *ide_mem[4];
 } MacIOState;
 
+#define OLDWORLD_MACIO(obj) \
+    OBJECT_CHECK(OldWorldMacIOState, (obj), TYPE_OLDWORLD_MACIO)
+
+typedef struct OldWorldMacIOState {
+    /*< private >*/
+    MacIOState parent_obj;
+    /*< public >*/
+
+    MacIONVRAMState nvram;
+} OldWorldMacIOState;
+
 static void macio_bar_setup(MacIOState *macio_state)
 {
     int i;
@@ -66,8 +76,6 @@ static void macio_bar_setup(MacIOState *macio_state)
                                         macio_state->ide_mem[i]);
         }
     }
-    if (macio_state->nvram != NULL)
-        macio_nvram_setup_bar(macio_state->nvram, bar, 0x60000);
 }
 
 static int macio_common_initfn(PCIDevice *d)
@@ -85,11 +93,22 @@ static int macio_common_initfn(PCIDevice *d)
 static int macio_oldworld_initfn(PCIDevice *d)
 {
     MacIOState *s = MACIO(d);
+    OldWorldMacIOState *os = OLDWORLD_MACIO(d);
+    SysBusDevice *sysbus_dev;
     int ret = macio_common_initfn(d);
     if (ret < 0) {
         return ret;
     }
 
+    ret = qdev_init(DEVICE(&os->nvram));
+    if (ret < 0) {
+        return ret;
+    }
+    sysbus_dev = SYS_BUS_DEVICE(&os->nvram);
+    memory_region_add_subregion(&s->bar, 0x60000,
+                                sysbus_mmio_get_region(sysbus_dev, 0));
+    pmac_format_nvram_partition(&os->nvram, os->nvram.size);
+
     if (s->pic_mem) {
         /* Heathrow PIC */
         memory_region_add_subregion(&s->bar, 0x00000, s->pic_mem);
@@ -98,6 +117,17 @@ static int macio_oldworld_initfn(PCIDevice *d)
     return 0;
 }
 
+static void macio_oldworld_init(Object *obj)
+{
+    OldWorldMacIOState *os = OLDWORLD_MACIO(obj);
+    DeviceState *dev;
+
+    object_initialize(&os->nvram, TYPE_MACIO_NVRAM);
+    dev = DEVICE(&os->nvram);
+    qdev_prop_set_uint32(dev, "size", 0x2000);
+    qdev_prop_set_uint32(dev, "it_shift", 4);
+}
+
 static int macio_newworld_initfn(PCIDevice *d)
 {
     MacIOState *s = MACIO(d);
@@ -148,6 +178,8 @@ static void macio_class_init(ObjectClass *klass, void *data)
 static const TypeInfo macio_oldworld_type_info = {
     .name          = TYPE_OLDWORLD_MACIO,
     .parent        = TYPE_MACIO,
+    .instance_size = sizeof(OldWorldMacIOState),
+    .instance_init = macio_oldworld_init,
     .class_init    = macio_oldworld_class_init,
 };
 
@@ -177,7 +209,7 @@ type_init(macio_register_types)
 
 void macio_init(PCIDevice *d,
                 MemoryRegion *pic_mem, MemoryRegion *dbdma_mem,
-                MemoryRegion *cuda_mem, void *nvram,
+                MemoryRegion *cuda_mem,
                 int nb_ide, MemoryRegion **ide_mem,
                 MemoryRegion *escc_mem)
 {
@@ -188,7 +220,6 @@ void macio_init(PCIDevice *d,
     macio_state->dbdma_mem = dbdma_mem;
     macio_state->cuda_mem = cuda_mem;
     macio_state->escc_mem = escc_mem;
-    macio_state->nvram = nvram;
     if (nb_ide > 4)
         nb_ide = 4;
     macio_state->nb_ide = nb_ide;
diff --git a/hw/ppc/mac.h b/hw/ppc/mac.h
index 6441794..581e95c 100644
--- a/hw/ppc/mac.h
+++ b/hw/ppc/mac.h
@@ -26,6 +26,7 @@
 #define __PPC_MAC_H__
 
 #include "exec/memory.h"
+#include "hw/sysbus.h"
 
 /* SMP is not enabled, for now */
 #define MAX_CPUS 1
@@ -49,7 +50,7 @@ void cuda_init (MemoryRegion **cuda_mem, qemu_irq irq);
 #define TYPE_NEWWORLD_MACIO "macio-newworld"
 void macio_init(PCIDevice *dev,
                 MemoryRegion *pic_mem, MemoryRegion *dbdma_mem,
-                MemoryRegion *cuda_mem, void *nvram,
+                MemoryRegion *cuda_mem,
                 int nb_ide, MemoryRegion **ide_mem, MemoryRegion *escc_mem);
 
 /* Heathrow PIC */
@@ -71,12 +72,22 @@ PCIBus *pci_pmac_u3_init(qemu_irq *pic,
                          MemoryRegion *address_space_io);
 
 /* Mac NVRAM */
-typedef struct MacIONVRAMState MacIONVRAMState;
+#define TYPE_MACIO_NVRAM "macio-nvram"
+#define MACIO_NVRAM(obj) \
+    OBJECT_CHECK(MacIONVRAMState, (obj), TYPE_MACIO_NVRAM)
+
+typedef struct MacIONVRAMState {
+    /*< private >*/
+    SysBusDevice parent_obj;
+    /*< public >*/
+
+    uint32_t size;
+    uint32_t it_shift;
+
+    MemoryRegion mem;
+    uint8_t *data;
+} MacIONVRAMState;
 
-MacIONVRAMState *macio_nvram_init (hwaddr size,
-                                   unsigned int it_shift);
-void macio_nvram_setup_bar(MacIONVRAMState *s, MemoryRegion *bar,
-                           hwaddr mem_base);
 void pmac_format_nvram_partition (MacIONVRAMState *nvr, int len);
 uint8_t macio_nvram_read(MacIONVRAMState *s, uint32_t addr);
 void macio_nvram_write(MacIONVRAMState *s, uint32_t addr, uint8_t val);
diff --git a/hw/ppc/mac_newworld.c b/hw/ppc/mac_newworld.c
index d1329dc..4aef010 100644
--- a/hw/ppc/mac_newworld.c
+++ b/hw/ppc/mac_newworld.c
@@ -377,7 +377,7 @@ static void ppc_core99_init(QEMUMachineInitArgs *args)
 
     macio = pci_create(pci_bus, -1, TYPE_NEWWORLD_MACIO);
     macio_init(macio, pic_mem,
-               dbdma_mem, cuda_mem, NULL, 3, ide_mem, escc_bar);
+               dbdma_mem, cuda_mem, 3, ide_mem, escc_bar);
 
     if (usb_enabled(machine_arch == ARCH_MAC99_U3)) {
         pci_create_simple(pci_bus, -1, "pci-ohci");
@@ -393,9 +393,13 @@ static void ppc_core99_init(QEMUMachineInitArgs *args)
         graphic_depth = 15;
 
     /* The NewWorld NVRAM is not located in the MacIO device */
-    nvr = macio_nvram_init(0x2000, 1);
+    dev = qdev_create(NULL, TYPE_MACIO_NVRAM);
+    qdev_prop_set_uint32(dev, "size", 0x2000);
+    qdev_prop_set_uint32(dev, "it_shift", 1);
+    qdev_init_nofail(dev);
+    sysbus_mmio_map(SYS_BUS_DEVICE(dev), 0, 0xFFF04000);
+    nvr = MACIO_NVRAM(dev);
     pmac_format_nvram_partition(nvr, 0x2000);
-    macio_nvram_setup_bar(nvr, get_system_memory(), 0xFFF04000);
     /* No PCI init: the BIOS will do it */
 
     fw_cfg = fw_cfg_init(0, 0, CFG_ADDR, CFG_ADDR + 2);
diff --git a/hw/ppc/mac_oldworld.c b/hw/ppc/mac_oldworld.c
index 74b3878..d1bfbff 100644
--- a/hw/ppc/mac_oldworld.c
+++ b/hw/ppc/mac_oldworld.c
@@ -91,7 +91,6 @@ static void ppc_heathrow_init(QEMUMachineInitArgs *args)
     int32_t kernel_size, initrd_size;
     PCIBus *pci_bus;
     PCIDevice *macio;
-    MacIONVRAMState *nvr;
     int bios_size;
     MemoryRegion *pic_mem, *dbdma_mem, *cuda_mem;
     MemoryRegion *escc_mem, *escc_bar = g_new(MemoryRegion, 1), *ide_mem[2];
@@ -281,12 +280,9 @@ static void ppc_heathrow_init(QEMUMachineInitArgs *args)
     adb_kbd_init(&adb_bus);
     adb_mouse_init(&adb_bus);
 
-    nvr = macio_nvram_init(0x2000, 4);
-    pmac_format_nvram_partition(nvr, 0x2000);
-
     macio = pci_create(pci_bus, -1, TYPE_OLDWORLD_MACIO);
     macio_init(macio, pic_mem,
-               dbdma_mem, cuda_mem, nvr, 2, ide_mem, escc_bar);
+               dbdma_mem, cuda_mem, 2, ide_mem, escc_bar);
 
     if (usb_enabled(false)) {
         pci_create_simple(pci_bus, -1, "pci-ohci");
