diff --git a/hw/arm-misc.h b/hw/arm-misc.h
index f8a747289b..af403a159a 100644
--- a/hw/arm-misc.h
+++ b/hw/arm-misc.h
@@ -11,13 +11,16 @@
 #ifndef ARM_MISC_H
 #define ARM_MISC_H 1
 
+#include "memory.h"
+
 /* The CPU is also modeled as an interrupt controller.  */
 #define ARM_PIC_CPU_IRQ 0
 #define ARM_PIC_CPU_FIQ 1
 qemu_irq *arm_pic_init_cpu(CPUState *env);
 
 /* armv7m.c */
-qemu_irq *armv7m_init(int flash_size, int sram_size,
+qemu_irq *armv7m_init(MemoryRegion *address_space_mem,
+                      int flash_size, int sram_size,
                       const char *kernel_filename, const char *cpu_model);
 
 /* arm_boot.c */
diff --git a/hw/armv7m.c b/hw/armv7m.c
index a932f16a44..28d41b82a6 100644
--- a/hw/armv7m.c
+++ b/hw/armv7m.c
@@ -156,7 +156,8 @@ static void armv7m_reset(void *opaque)
    flash_size and sram_size are in kb.
    Returns the NVIC array.  */
 
-qemu_irq *armv7m_init(int flash_size, int sram_size,
+qemu_irq *armv7m_init(MemoryRegion *address_space_mem,
+                      int flash_size, int sram_size,
                       const char *kernel_filename, const char *cpu_model)
 {
     CPUState *env;
@@ -169,6 +170,9 @@ qemu_irq *armv7m_init(int flash_size, int sram_size,
     uint64_t lowaddr;
     int i;
     int big_endian;
+    MemoryRegion *sram = g_new(MemoryRegion, 1);
+    MemoryRegion *flash = g_new(MemoryRegion, 1);
+    MemoryRegion *hack = g_new(MemoryRegion, 1);
 
     flash_size *= 1024;
     sram_size *= 1024;
@@ -194,12 +198,11 @@ qemu_irq *armv7m_init(int flash_size, int sram_size,
 #endif
 
     /* Flash programming is done via the SCU, so pretend it is ROM.  */
-    cpu_register_physical_memory(0, flash_size,
-                                 qemu_ram_alloc(NULL, "armv7m.flash",
-                                                flash_size) | IO_MEM_ROM);
-    cpu_register_physical_memory(0x20000000, sram_size,
-                                 qemu_ram_alloc(NULL, "armv7m.sram",
-                                                sram_size) | IO_MEM_RAM);
+    memory_region_init_ram(flash, NULL, "armv7m.flash", flash_size);
+    memory_region_set_readonly(flash, true);
+    memory_region_add_subregion(address_space_mem, 0, flash);
+    memory_region_init_ram(sram, NULL, "armv7m.sram", sram_size);
+    memory_region_add_subregion(address_space_mem, 0x20000000, sram);
     armv7m_bitband_init();
 
     nvic = qdev_create(NULL, "armv7m_nvic");
@@ -232,9 +235,8 @@ qemu_irq *armv7m_init(int flash_size, int sram_size,
     /* Hack to map an additional page of ram at the top of the address
        space.  This stops qemu complaining about executing code outside RAM
        when returning from an exception.  */
-    cpu_register_physical_memory(0xfffff000, 0x1000,
-                                 qemu_ram_alloc(NULL, "armv7m.hack", 
-                                                0x1000) | IO_MEM_RAM);
+    memory_region_init_ram(hack, NULL, "armv7m.hack", 0x1000);
+    memory_region_add_subregion(address_space_mem, 0xfffff000, hack);
 
     qemu_register_reset(armv7m_reset, env);
     return pic;
diff --git a/hw/stellaris.c b/hw/stellaris.c
index 9b0db7f511..2bf1c235dc 100644
--- a/hw/stellaris.c
+++ b/hw/stellaris.c
@@ -15,6 +15,7 @@
 #include "i2c.h"
 #include "net.h"
 #include "boards.h"
+#include "exec-memory.h"
 
 #define GPIO_A 0
 #define GPIO_B 1
@@ -1260,6 +1261,7 @@ static void stellaris_init(const char *kernel_filename, const char *cpu_model,
         0x40024000, 0x40025000, 0x40026000};
     static const int gpio_irq[7] = {0, 1, 2, 3, 4, 30, 31};
 
+    MemoryRegion *address_space_mem = get_system_memory();
     qemu_irq *pic;
     DeviceState *gpio_dev[7];
     qemu_irq gpio_in[7][8];
@@ -1274,7 +1276,8 @@ static void stellaris_init(const char *kernel_filename, const char *cpu_model,
 
     flash_size = ((board->dc0 & 0xffff) + 1) << 1;
     sram_size = (board->dc0 >> 18) + 1;
-    pic = armv7m_init(flash_size, sram_size, kernel_filename, cpu_model);
+    pic = armv7m_init(address_space_mem,
+                      flash_size, sram_size, kernel_filename, cpu_model);
 
     if (board->dc1 & (1 << 16)) {
         dev = sysbus_create_varargs("stellaris-adc", 0x40038000,