diff --git a/hw/slavio_misc.c b/hw/slavio_misc.c
index 9110c64b79b1112d4073c4722d0d791aa68dedfd..db266ba8ad9a0b7a081307a3ed20dc050e431a48 100644
--- a/hw/slavio_misc.c
+++ b/hw/slavio_misc.c
@@ -39,6 +39,7 @@ typedef struct MiscState {
     MemoryRegion cfg_iomem;
     MemoryRegion diag_iomem;
     MemoryRegion mdm_iomem;
+    MemoryRegion led_iomem;
     qemu_irq irq;
     qemu_irq fdc_tc;
     uint32_t dummy;
@@ -345,7 +346,8 @@ static CPUWriteMemoryFunc * const slavio_sysctrl_mem_write[3] = {
     slavio_sysctrl_mem_writel,
 };
 
-static uint32_t slavio_led_mem_readw(void *opaque, target_phys_addr_t addr)
+static uint64_t slavio_led_mem_readw(void *opaque, target_phys_addr_t addr,
+                                     unsigned size)
 {
     MiscState *s = opaque;
     uint32_t ret = 0;
@@ -362,7 +364,7 @@ static uint32_t slavio_led_mem_readw(void *opaque, target_phys_addr_t addr)
 }
 
 static void slavio_led_mem_writew(void *opaque, target_phys_addr_t addr,
-                                  uint32_t val)
+                                  uint64_t val, unsigned size)
 {
     MiscState *s = opaque;
 
@@ -376,16 +378,14 @@ static void slavio_led_mem_writew(void *opaque, target_phys_addr_t addr,
     }
 }
 
-static CPUReadMemoryFunc * const slavio_led_mem_read[3] = {
-    NULL,
-    slavio_led_mem_readw,
-    NULL,
-};
-
-static CPUWriteMemoryFunc * const slavio_led_mem_write[3] = {
-    NULL,
-    slavio_led_mem_writew,
-    NULL,
+static const MemoryRegionOps slavio_led_mem_ops = {
+    .read = slavio_led_mem_readw,
+    .write = slavio_led_mem_writew,
+    .endianness = DEVICE_NATIVE_ENDIAN,
+    .valid = {
+        .min_access_size = 2,
+        .max_access_size = 2,
+    },
 };
 
 static const VMStateDescription vmstate_misc = {
@@ -444,10 +444,9 @@ static int slavio_misc_init1(SysBusDevice *dev)
 
     /* 16 bit registers */
     /* ss600mp diag LEDs */
-    io = cpu_register_io_memory(slavio_led_mem_read,
-                                slavio_led_mem_write, s,
-                                DEVICE_NATIVE_ENDIAN);
-    sysbus_init_mmio(dev, MISC_SIZE, io);
+    memory_region_init_io(&s->led_iomem, &slavio_led_mem_ops, s,
+                          "leds", MISC_SIZE);
+    sysbus_init_mmio_region(dev, &s->led_iomem);
 
     /* 32 bit registers */
     /* System control */