diff --git a/hw/ppc/ppc405.h b/hw/ppc/ppc405.h
index f7c0eb1d0008..e56363366cad 100644
--- a/hw/ppc/ppc405.h
+++ b/hw/ppc/ppc405.h
@@ -65,6 +65,23 @@ struct ppc4xx_bd_info_t {
 
 typedef struct Ppc405SoCState Ppc405SoCState;
 
+/* On Chip Memory */
+#define TYPE_PPC405_OCM "ppc405-ocm"
+OBJECT_DECLARE_SIMPLE_TYPE(Ppc405OcmState, PPC405_OCM);
+struct Ppc405OcmState {
+    SysBusDevice parent_obj;
+
+    PowerPCCPU *cpu;
+
+    MemoryRegion ram;
+    MemoryRegion isarc_ram;
+    MemoryRegion dsarc_ram;
+    uint32_t isarc;
+    uint32_t isacntl;
+    uint32_t dsarc;
+    uint32_t dsacntl;
+};
+
 /* General purpose timers */
 #define TYPE_PPC405_GPT "ppc405-gpt"
 OBJECT_DECLARE_SIMPLE_TYPE(Ppc405GptState, PPC405_GPT);
@@ -141,6 +158,7 @@ struct Ppc405SoCState {
     DeviceState *uic;
     Ppc405CpcState cpc;
     Ppc405GptState gpt;
+    Ppc405OcmState ocm;
 };
 
 /* PowerPC 405 core */
diff --git a/hw/ppc/ppc405_uc.c b/hw/ppc/ppc405_uc.c
index 0f5e4ec15f14..59cade4c0680 100644
--- a/hw/ppc/ppc405_uc.c
+++ b/hw/ppc/ppc405_uc.c
@@ -773,20 +773,9 @@ enum {
     OCM0_DSACNTL = 0x01B,
 };
 
-typedef struct ppc405_ocm_t ppc405_ocm_t;
-struct ppc405_ocm_t {
-    MemoryRegion ram;
-    MemoryRegion isarc_ram;
-    MemoryRegion dsarc_ram;
-    uint32_t isarc;
-    uint32_t isacntl;
-    uint32_t dsarc;
-    uint32_t dsacntl;
-};
-
-static void ocm_update_mappings (ppc405_ocm_t *ocm,
-                                 uint32_t isarc, uint32_t isacntl,
-                                 uint32_t dsarc, uint32_t dsacntl)
+static void ocm_update_mappings(Ppc405OcmState *ocm,
+                                uint32_t isarc, uint32_t isacntl,
+                                uint32_t dsarc, uint32_t dsacntl)
 {
     trace_ocm_update_mappings(isarc, isacntl, dsarc, dsacntl, ocm->isarc,
                               ocm->isacntl, ocm->dsarc, ocm->dsacntl);
@@ -830,10 +819,9 @@ static void ocm_update_mappings (ppc405_ocm_t *ocm,
 
 static uint32_t dcr_read_ocm (void *opaque, int dcrn)
 {
-    ppc405_ocm_t *ocm;
+    Ppc405OcmState *ocm = PPC405_OCM(opaque);
     uint32_t ret;
 
-    ocm = opaque;
     switch (dcrn) {
     case OCM0_ISARC:
         ret = ocm->isarc;
@@ -857,10 +845,9 @@ static uint32_t dcr_read_ocm (void *opaque, int dcrn)
 
 static void dcr_write_ocm (void *opaque, int dcrn, uint32_t val)
 {
-    ppc405_ocm_t *ocm;
+    Ppc405OcmState *ocm = PPC405_OCM(opaque);
     uint32_t isarc, dsarc, isacntl, dsacntl;
 
-    ocm = opaque;
     isarc = ocm->isarc;
     dsarc = ocm->dsarc;
     isacntl = ocm->isacntl;
@@ -886,12 +873,11 @@ static void dcr_write_ocm (void *opaque, int dcrn, uint32_t val)
     ocm->dsacntl = dsacntl;
 }
 
-static void ocm_reset (void *opaque)
+static void ppc405_ocm_reset(DeviceState *dev)
 {
-    ppc405_ocm_t *ocm;
+    Ppc405OcmState *ocm = PPC405_OCM(dev);
     uint32_t isarc, dsarc, isacntl, dsacntl;
 
-    ocm = opaque;
     isarc = 0x00000000;
     isacntl = 0x00000000;
     dsarc = 0x00000000;
@@ -903,17 +889,21 @@ static void ocm_reset (void *opaque)
     ocm->dsacntl = dsacntl;
 }
 
-static void ppc405_ocm_init(CPUPPCState *env)
+static void ppc405_ocm_realize(DeviceState *dev, Error **errp)
 {
-    ppc405_ocm_t *ocm;
+    Ppc405OcmState *ocm = PPC405_OCM(dev);
+    CPUPPCState *env;
+
+    assert(ocm->cpu);
+
+    env = &ocm->cpu->env;
 
-    ocm = g_new0(ppc405_ocm_t, 1);
     /* XXX: Size is 4096 or 0x04000000 */
-    memory_region_init_ram(&ocm->isarc_ram, NULL, "ppc405.ocm", 4 * KiB,
+    memory_region_init_ram(&ocm->isarc_ram, OBJECT(ocm), "ppc405.ocm", 4 * KiB,
                            &error_fatal);
-    memory_region_init_alias(&ocm->dsarc_ram, NULL, "ppc405.dsarc",
+    memory_region_init_alias(&ocm->dsarc_ram, OBJECT(ocm), "ppc405.dsarc",
                              &ocm->isarc_ram, 0, 4 * KiB);
-    qemu_register_reset(&ocm_reset, ocm);
+
     ppc_dcr_register(env, OCM0_ISARC,
                      ocm, &dcr_read_ocm, &dcr_write_ocm);
     ppc_dcr_register(env, OCM0_ISACNTL,
@@ -924,6 +914,22 @@ static void ppc405_ocm_init(CPUPPCState *env)
                      ocm, &dcr_read_ocm, &dcr_write_ocm);
 }
 
+static Property ppc405_ocm_properties[] = {
+    DEFINE_PROP_LINK("cpu", Ppc405OcmState, cpu, TYPE_POWERPC_CPU,
+                     PowerPCCPU *),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
+static void ppc405_ocm_class_init(ObjectClass *oc, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(oc);
+
+    dc->realize = ppc405_ocm_realize;
+    dc->user_creatable = false;
+    dc->reset = ppc405_ocm_reset;
+    device_class_set_props(dc, ppc405_ocm_properties);
+}
+
 /*****************************************************************************/
 /* General purpose timers */
 static int ppc4xx_gpt_compare(Ppc405GptState *gpt, int n)
@@ -1413,6 +1419,8 @@ static void ppc405_soc_instance_init(Object *obj)
     object_property_add_alias(obj, "sys-clk", OBJECT(&s->cpc), "sys-clk");
 
     object_initialize_child(obj, "gpt", &s->gpt, TYPE_PPC405_GPT);
+
+    object_initialize_child(obj, "ocm", &s->ocm, TYPE_PPC405_OCM);
 }
 
 static void ppc405_soc_realize(DeviceState *dev, Error **errp)
@@ -1517,7 +1525,11 @@ static void ppc405_soc_realize(DeviceState *dev, Error **errp)
     }
 
     /* OCM */
-    ppc405_ocm_init(env);
+    object_property_set_link(OBJECT(&s->ocm), "cpu", OBJECT(&s->cpu),
+                             &error_abort);
+    if (!sysbus_realize(SYS_BUS_DEVICE(&s->ocm), errp)) {
+        return;
+    }
 
     /* GPT */
     if (!sysbus_realize(SYS_BUS_DEVICE(&s->gpt), errp)) {
@@ -1560,6 +1572,11 @@ static void ppc405_soc_class_init(ObjectClass *oc, void *data)
 
 static const TypeInfo ppc405_types[] = {
     {
+        .name           = TYPE_PPC405_OCM,
+        .parent         = TYPE_SYS_BUS_DEVICE,
+        .instance_size  = sizeof(Ppc405OcmState),
+        .class_init     = ppc405_ocm_class_init,
+    }, {
         .name           = TYPE_PPC405_GPT,
         .parent         = TYPE_SYS_BUS_DEVICE,
         .instance_size  = sizeof(Ppc405GptState),
