diff --git a/boot/mbed/src/flash_map_backend.cpp b/boot/mbed/src/flash_map_backend.cpp
new file mode 100644
index 0000000..a28817a
--- /dev/null
+++ b/boot/mbed/src/flash_map_backend.cpp
@@ -0,0 +1,211 @@
+/*
+ * Copyright (c) 2020 Embedded Planet
+ * Copyright (c) 2020 ARM Limited
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License
+ */
+
+#include <assert.h>
+#include <cstring>
+#include "flash_map_backend/flash_map_backend.h"
+#include "flash_map_backend/secondary_bd.h"
+#include "sysflash/sysflash.h"
+
+#include "blockdevice/BlockDevice.h"
+#include "FlashIAP/FlashIAPBlockDevice.h"
+
+#include "mcuboot_config/mcuboot_logging.h"
+
+#define FLASH_DEVICE_INTERNAL_FLASH 0
+#define FLASH_AREAS 3
+
+/** Application defined secondary block device */
+mbed::BlockDevice* mcuboot_secondary_bd = get_secondary_bd();
+
+/** Internal application block device */
+static FlashIAPBlockDevice mcuboot_primary_bd(MCUBOOT_PRIMARY_SLOT_START_ADDR, MCUBOOT_SLOT_SIZE);
+
+#ifndef MCUBOOT_OVERWRITE_ONLY
+/** Scratch space is at the end of internal flash, after the main application */
+static FlashIAPBlockDevice mcuboot_scratch_bd(MCUBOOT_SCRATCH_START_ADDR, MCUBOOT_SCRATCH_SIZE);
+#endif
+
+static mbed::BlockDevice* flash_map_bd[FLASH_AREAS] = {
+        (mbed::BlockDevice*) &mcuboot_primary_bd,       /** Primary (loadable) image area */
+        mcuboot_secondary_bd,                           /** Secondary (update candidate) image area */
+#ifndef MCUBOOT_OVERWRITE_ONLY
+        (mbed::BlockDevice*) &mcuboot_scratch_bd        /** Scratch space for swapping images */
+#else
+        nullptr
+#endif
+};
+
+static struct flash_area flash_areas[FLASH_AREAS];
+
+int flash_area_open(uint8_t id, const struct flash_area** fapp) {
+
+    *fapp = &flash_areas[id];
+    struct flash_area* fap = (struct flash_area*)*fapp;
+
+    // The offset of the slot is from the beginning of the flash device.
+    switch (id) {
+        case PRIMARY_ID:
+            fap->fa_off = MCUBOOT_PRIMARY_SLOT_START_ADDR;
+            break;
+        case SECONDARY_ID:
+            // The offset of the secondary slot is not currently used.
+            fap->fa_off = 0;
+            break;
+#ifndef MCUBOOT_OVERWRITE_ONLY
+        case SCRATCH_ID:
+            fap->fa_off = MCUBOOT_SCRATCH_START_ADDR;
+            break;
+#endif
+        default:
+            MCUBOOT_LOG_ERR("flash_area_open, unknown id %d", id);
+            return -1;
+    }
+
+    fap->fa_id = id;
+    fap->fa_device_id = 0; // not relevant
+
+    mbed::BlockDevice* bd = flash_map_bd[id];
+    fap->fa_size = (uint32_t) bd->size();
+    return bd->init();
+}
+
+void flash_area_close(const struct flash_area* fap) {
+    mbed::BlockDevice* bd = flash_map_bd[fap->fa_id];
+    bd->deinit();
+}
+
+/*
+ * Read/write/erase. Offset is relative from beginning of flash area.
+ */
+int flash_area_read(const struct flash_area* fap, uint32_t off, void* dst, uint32_t len) {
+    mbed::BlockDevice* bd = flash_map_bd[fap->fa_id];
+
+    // Note: The address must be aligned to bd->get_read_size(). If MCUBOOT_READ_GRANULARITY
+    // is defined, the length does not need to be aligned.
+#ifdef MCUBOOT_READ_GRANULARITY
+    uint32_t read_size = bd->get_read_size();
+    if (read_size == 0) {
+        MCUBOOT_LOG_ERR("Invalid read size: must be non-zero");
+        return -1;
+    }
+    if (MCUBOOT_READ_GRANULARITY < read_size) {
+        MCUBOOT_LOG_ERR("Please increase MCUBOOT_READ_GRANULARITY (currently %u) to be at least %u",
+                    MCUBOOT_READ_GRANULARITY, read_size);
+        return -1;
+    }
+
+    uint32_t remainder = len % read_size;
+    len -= remainder;
+    if (len != 0) {
+#endif
+        if (!bd->is_valid_read(off, len)) {
+            MCUBOOT_LOG_ERR("Invalid read: fa_id %d offset 0x%x len 0x%x", fap->fa_id, off, len);
+            return -1;
+        }
+        else {
+            int ret = bd->read(dst, off, len);
+            if (ret != 0) {
+                MCUBOOT_LOG_ERR("Read failed: fa_id %d offset 0x%x len 0x%x", fap->fa_id, off, len);
+                return ret;
+            }
+        }
+#ifdef MCUBOOT_READ_GRANULARITY
+    }
+
+    if (remainder) {
+        if (!bd->is_valid_read(off + len, read_size)) {
+            MCUBOOT_LOG_ERR("Invalid read: fa_id %d offset 0x%x len 0x%x", fap->fa_id, off + len, read_size);
+            return -1;
+        }
+        else {
+            uint8_t buffer[MCUBOOT_READ_GRANULARITY];
+            int ret = bd->read(buffer, off + len, read_size);
+            if (ret != 0) {
+                MCUBOOT_LOG_ERR("Read failed: %d", ret);
+                return ret;
+            }
+            memcpy((uint8_t *)dst + len, buffer, remainder);
+        }
+    }
+#endif
+
+    return 0;
+}
+
+int flash_area_write(const struct flash_area* fap, uint32_t off, const void* src, uint32_t len) {
+    mbed::BlockDevice* bd = flash_map_bd[fap->fa_id];
+    return bd->program(src, off, len);
+}
+
+int flash_area_erase(const struct flash_area* fap, uint32_t off, uint32_t len) {
+    mbed::BlockDevice* bd = flash_map_bd[fap->fa_id];
+    return bd->erase(off, len);
+}
+
+uint8_t flash_area_align(const struct flash_area* fap) {
+    mbed::BlockDevice* bd = flash_map_bd[fap->fa_id];
+    return bd->get_program_size();
+}
+
+uint8_t flash_area_erased_val(const struct flash_area* fap) {
+    mbed::BlockDevice* bd = flash_map_bd[fap->fa_id];
+    return bd->get_erase_value();
+}
+
+int flash_area_get_sectors(int fa_id, uint32_t* count, struct flash_sector* sectors) {
+    mbed::BlockDevice* bd = flash_map_bd[fa_id];
+
+    // Loop through sectors and collect information on them
+    bd_addr_t offset = 0;
+    *count = 0;
+    while (*count < MCUBOOT_MAX_IMG_SECTORS && bd->is_valid_read(offset, bd->get_read_size())) {
+
+        sectors[*count].fs_off = offset;
+        bd_size_t erase_size = bd->get_erase_size(offset);
+        sectors[*count].fs_size = erase_size;
+
+        offset += erase_size;
+        *count += 1;
+    }
+
+    return 0;
+}
+
+int flash_area_id_from_image_slot(int slot) {
+    return slot;
+}
+
+int flash_area_id_to_image_slot(int area_id) {
+    return area_id;
+}
+
+/**
+ * Multi images support not implemented yet
+ */
+int flash_area_id_from_multi_image_slot(int image_index, int slot)
+{
+    assert(image_index == 0);
+    return slot;
+}
+
+int flash_area_id_to_multi_image_slot(int image_index, int area_id)
+{
+    assert(image_index == 0);
+    return area_id;
+}