diff --git a/hw/ppc/sam460ex.c b/hw/ppc/sam460ex.c
index f03cdc9ecc..4a22ce3761 100644
--- a/hw/ppc/sam460ex.c
+++ b/hw/ppc/sam460ex.c
@@ -123,13 +123,12 @@ static int sam460ex_load_uboot(void)
     return 0;
 }
 
-static int sam460ex_load_device_tree(hwaddr addr,
-                                     uint32_t ramsize,
+static int sam460ex_load_device_tree(MachineState *machine,
+                                     hwaddr addr,
                                      hwaddr initrd_base,
-                                     hwaddr initrd_size,
-                                     const char *kernel_cmdline)
+                                     hwaddr initrd_size)
 {
-    uint32_t mem_reg_property[] = { 0, 0, cpu_to_be32(ramsize) };
+    uint32_t mem_reg_property[] = { 0, 0, cpu_to_be32(machine->ram_size) };
     char *filename;
     int fdt_size;
     void *fdt;
@@ -163,7 +162,8 @@ static int sam460ex_load_device_tree(hwaddr addr,
     qemu_fdt_setprop_cell(fdt, "/chosen", "linux,initrd-end",
                           (initrd_base + initrd_size));
 
-    qemu_fdt_setprop_string(fdt, "/chosen", "bootargs", kernel_cmdline);
+    qemu_fdt_setprop_string(fdt, "/chosen", "bootargs",
+                            machine->kernel_cmdline);
 
     /* Copy data from the host device tree into the guest. Since the guest can
      * directly access the timebase without host involvement, we must expose
@@ -200,7 +200,9 @@ static int sam460ex_load_device_tree(hwaddr addr,
                               EBC_FREQ);
 
     rom_add_blob_fixed(BINARY_DEVICE_TREE_FILE, fdt, fdt_size, addr);
-    g_free(fdt);
+
+    /* Set machine->fdt for 'dumpdtb' QMP/HMP command */
+    machine->fdt = fdt;
 
     return fdt_size;
 }
@@ -500,9 +502,8 @@ static void sam460ex_init(MachineState *machine)
     if (machine->kernel_filename) {
         int dt_size;
 
-        dt_size = sam460ex_load_device_tree(FDT_ADDR, machine->ram_size,
-                                    RAMDISK_ADDR, initrd_size,
-                                    machine->kernel_cmdline);
+        dt_size = sam460ex_load_device_tree(machine, FDT_ADDR,
+                                            RAMDISK_ADDR, initrd_size);
 
         boot_info->dt_base = FDT_ADDR;
         boot_info->dt_size = dt_size;