diff --git a/hw/ppc/mac_newworld.c b/hw/ppc/mac_newworld.c
index 2ca294664b..a6b95f024c 100644
--- a/hw/ppc/mac_newworld.c
+++ b/hw/ppc/mac_newworld.c
@@ -454,7 +454,17 @@ static void ppc_core99_init(MachineState *machine)
     pmac_format_nvram_partition(nvr, 0x2000);
     /* No PCI init: the BIOS will do it */
 
-    fw_cfg = fw_cfg_init_mem(CFG_ADDR, CFG_ADDR + 2);
+    dev = qdev_create(NULL, TYPE_FW_CFG_MEM);
+    fw_cfg = FW_CFG(dev);
+    qdev_prop_set_uint32(dev, "data_width", 1);
+    qdev_prop_set_bit(dev, "dma_enabled", false);
+    object_property_add_child(OBJECT(qdev_get_machine()), TYPE_FW_CFG,
+                              OBJECT(fw_cfg), NULL);
+    qdev_init_nofail(dev);
+    s = SYS_BUS_DEVICE(dev);
+    sysbus_mmio_map(s, 0, CFG_ADDR);
+    sysbus_mmio_map(s, 1, CFG_ADDR + 2);
+
     fw_cfg_add_i16(fw_cfg, FW_CFG_NB_CPUS, (uint16_t)smp_cpus);
     fw_cfg_add_i16(fw_cfg, FW_CFG_MAX_CPUS, (uint16_t)max_cpus);
     fw_cfg_add_i64(fw_cfg, FW_CFG_RAM_SIZE, (uint64_t)ram_size);