diff --git a/features/storage/kvstore/conf/filesystem/mbed_lib.json b/features/storage/kvstore/conf/filesystem/mbed_lib.json
index af9727c721..5afb3ce7aa 100644
--- a/features/storage/kvstore/conf/filesystem/mbed_lib.json
+++ b/features/storage/kvstore/conf/filesystem/mbed_lib.json
@@ -14,7 +14,7 @@
             "value": "default"
         },
         "blockdevice": {
-            "help": "Options are default, SPIF, DATAFASH, QSPIF or SD. If default, the block device will be chosen according to the component defined in targets.json",
+            "help": "Options are default, SPIF, DATAFASH, QSPIF, SD or other. If default, the block device will be chosen according to the component defined in targets.json. If other, override get_other_blockdevice() to support block device out of Mbed OS tree.",
             "value": "default"
         },
         "external_size": {
diff --git a/features/storage/kvstore/conf/filesystem_no_rbp/mbed_lib.json b/features/storage/kvstore/conf/filesystem_no_rbp/mbed_lib.json
index 5ecf2841a2..8202a681fd 100644
--- a/features/storage/kvstore/conf/filesystem_no_rbp/mbed_lib.json
+++ b/features/storage/kvstore/conf/filesystem_no_rbp/mbed_lib.json
@@ -6,7 +6,7 @@
             "value": "default"
         },
         "blockdevice": {
-            "help": "Options are default, SPIF, DATAFLASH, QSPIF or SD. If default the block device will be chosen by the defined component",
+            "help": "Options are default, SPIF, DATAFLASH, QSPIF, SD or other. If default the block device will be chosen by the defined component. If other, override get_other_blockdevice() to support block device out of Mbed OS tree.",
             "value": "default"
         },
         "external_size": {
diff --git a/features/storage/kvstore/conf/kv_config.cpp b/features/storage/kvstore/conf/kv_config.cpp
index 852e153f22..7105a108ed 100644
--- a/features/storage/kvstore/conf/kv_config.cpp
+++ b/features/storage/kvstore/conf/kv_config.cpp
@@ -134,6 +134,14 @@ int _storage_config_FILESYSTEM_NO_RBP();
 int _storage_config_tdb_external_common();
 int _storage_config_filesystem_common();
 
+/**
+ * @brief If block device out of Mbed OS tree is to support, please overwrite this
+ *        function to provide it.
+ *
+ * @returns pointer to other block device.
+ */
+BlockDevice *get_other_blockdevice();
+
 static const char *filesystemstore_folder_path = NULL;
 
 using namespace mbed;
@@ -245,7 +253,16 @@ FileSystem *_get_filesystem_default(const char *mount)
 #elif COMPONENT_SD
     return _get_filesystem_FAT(mount);
 #else
-    return NULL;
+    BlockDevice *bd = get_other_blockdevice();
+    if (bd) {
+        if (bd->get_erase_value() != -1) {
+            return _get_filesystem_LITTLE(mount);
+        } else {
+            return _get_filesystem_FAT(mount);
+        }
+    } else {
+        return NULL;
+    }
 #endif
 }
 
@@ -617,6 +634,64 @@ BlockDevice *_get_blockdevice_default(bd_addr_t start_address, bd_size_t size)
 #endif
 }
 
+/* Same logic as _get_blockdevice_SD() except block device replaced with from
+ * get_other_blockdevice() */
+BlockDevice *_get_blockdevice_other(bd_addr_t start_address, bd_size_t size)
+{
+    bd_addr_t aligned_end_address;
+    bd_addr_t aligned_start_address;
+
+    BlockDevice *bd = get_other_blockdevice();
+    if (bd == NULL) {
+        tr_error("KV Config: \"other\" block device init fail");
+        return NULL;
+    }
+
+    if (bd->init() != MBED_SUCCESS) {
+        tr_error("KV Config: SDBlockDevice init fail");
+        return NULL;
+    }
+
+    if (strcmp(STR(MBED_CONF_STORAGE_STORAGE_TYPE), "TDB_EXTERNAL_NO_RBP") == 0 ||
+            strcmp(STR(MBED_CONF_STORAGE_STORAGE_TYPE), "TDB_EXTERNAL") == 0) {
+        //In TDBStore profile, we have a constraint of 4GByte
+        if (start_address == 0 && size == 0  && bd->size() < (uint32_t)(-1)) {
+            return bd;
+        }
+
+        //If the size of external storage is bigger than 4G we need to slice it.
+        size = size != 0 ? size : align_down(bd->size(), bd->get_erase_size(bd->size() - 1));
+
+        if (_get_addresses(bd, start_address, size, &aligned_start_address, &aligned_end_address) != 0) {
+            tr_error("KV Config: Fail to get addresses for SlicingBlockDevice.");
+            return NULL;
+        }
+
+        if (aligned_end_address - aligned_start_address != (uint32_t)(aligned_end_address - aligned_start_address)) {
+            aligned_end_address = aligned_start_address + (uint32_t)(-1);//Support up to 4G only
+        }
+    } else {
+        //For all other KVStore profiles beside TDBStore we take the entire external memory space.
+        if (start_address == 0 && size == 0) {
+            return bd;
+        }
+
+        if (_get_addresses(bd, start_address, size, &aligned_start_address, &aligned_end_address) != 0) {
+            tr_error("KV Config: Fail to get addresses for SlicingBlockDevice.");
+            return NULL;
+        }
+    }
+
+    aligned_end_address = align_down(aligned_end_address, bd->get_erase_size(aligned_end_address));
+    static SlicingBlockDevice sbd(bd, aligned_start_address, aligned_end_address);
+    return &sbd;
+}
+
+MBED_WEAK BlockDevice *get_other_blockdevice()
+{
+    return NULL;
+}
+
 int _storage_config_TDB_INTERNAL()
 {
 #if COMPONENT_FLASHIAP
@@ -750,17 +825,10 @@ int _storage_config_TDB_EXTERNAL()
         return MBED_ERROR_FAILED_OPERATION ;
     }
 
-    //TDBStore needs a block device base on flash. so if this is SD block device or the default block device is SD
-    //add FlashSimBlockDevice on top of the SDBlockDevice
-#if defined(COMPONENT_SD)
-    if (strcmp(STR(MBED_CONF_STORAGE_TDB_EXTERNAL_BLOCKDEVICE), "SD") == 0
-#if defined(COMPONENT_SD) &&  !defined(COMPONENT_SPIF) && !defined(COMPONENT_QSPIF) && !defined(COMPONENT_DATAFLASH)
-            ||  strcmp(STR(MBED_CONF_STORAGE_TDB_EXTERNAL_BLOCKDEVICE), "default") == 0) {
-#else
-       ) {
-
-#endif
-        //TDBStore need FlashSimBlockDevice when working with SD block device
+    //TDBStore needs a block device base on flash. So if this is non-flash type block device,
+    //add FlashSimBlockDevice on top of it.
+    if (bd->get_erase_value() == -1) {
+        //TDBStore needs FlashSimBlockDevice when working with non-flash type block device
         if (bd->init() != MBED_SUCCESS) {
             tr_error("KV Config: Fail to init external BlockDevice.");
             return MBED_ERROR_FAILED_OPERATION ;
@@ -771,9 +839,6 @@ int _storage_config_TDB_EXTERNAL()
     } else {
         kvstore_config.external_bd = bd;
     }
-#else
-    kvstore_config.external_bd = bd;
-#endif
 
     kvstore_config.flags_mask = ~(0);
 
@@ -795,17 +860,10 @@ int _storage_config_TDB_EXTERNAL_NO_RBP()
         return MBED_ERROR_FAILED_OPERATION ;
     }
 
-    //TDBStore needs a block device base on flash. so if this is SD block device or the default block device is SD
+    //TDBStore needs a block device base on flash. So if this is non-flash type block device,
     //add FlashSimBlockDevice on top of the SDBlockDevice
-#if defined(COMPONENT_SD)
-    if (strcmp(STR(MBED_CONF_STORAGE_TDB_EXTERNAL_NO_RBP_BLOCKDEVICE), "SD") == 0
-#if defined(COMPONENT_SD) &&  !defined(COMPONENT_SPIF) && !defined(COMPONENT_QSPIF) && !defined(COMPONENT_DATAFLASH)
-            ||  strcmp(STR(MBED_CONF_STORAGE_TDB_EXTERNAL_NO_RBP_BLOCKDEVICE), "default") == 0) {
-#else
-       ) {
-
-#endif
-        //TDBStore need FlashSimBlockDevice when working with SD block device
+    if (bd->get_erase_value() == -1) {
+        //TDBStore needs FlashSimBlockDevice when working with non-flash type block device
         if (bd->init() != MBED_SUCCESS) {
             tr_error("KV Config: Fail to init external BlockDevice.");
             return MBED_ERROR_FAILED_OPERATION ;
@@ -816,9 +874,6 @@ int _storage_config_TDB_EXTERNAL_NO_RBP()
     } else {
         kvstore_config.external_bd = bd;
     }
-#else
-    kvstore_config.external_bd = bd;
-#endif
 
     //Masking flag - Actually used to remove any KVStore flag which is not supported
     //in the chosen KVStore profile.
@@ -1069,7 +1124,16 @@ int _storage_config_default()
 #elif COMPONENT_FLASHIAP
     return _storage_config_TDB_INTERNAL();
 #else
-    return MBED_ERROR_UNSUPPORTED;
+    BlockDevice *bd = get_other_blockdevice();
+    if (bd) {
+        if (bd->get_erase_value() != -1) {
+            return _storage_config_TDB_EXTERNAL();
+        } else {
+            return _storage_config_FILESYSTEM();
+        }
+    } else {
+        return MBED_ERROR_UNSUPPORTED;
+    }
 #endif
 }
 
diff --git a/features/storage/kvstore/conf/tdb_external/mbed_lib.json b/features/storage/kvstore/conf/tdb_external/mbed_lib.json
index c102776dcb..215cd888eb 100644
--- a/features/storage/kvstore/conf/tdb_external/mbed_lib.json
+++ b/features/storage/kvstore/conf/tdb_external/mbed_lib.json
@@ -11,7 +11,7 @@
             "value": "0"
         },
         "blockdevice": {
-            "help": "Options are default, SPIF, DATAFASH, QSPIF or SD. If default the block device will be chosen by the defined component",
+            "help": "Options are default, SPIF, DATAFASH, QSPIF, SD or other. If default the block device will be chosen by the defined component. If other, override get_other_blockdevice() to support block device out of Mbed OS tree.",
             "value": "default"
         },
         "external_size": {
diff --git a/features/storage/kvstore/conf/tdb_external_no_rbp/mbed_lib.json b/features/storage/kvstore/conf/tdb_external_no_rbp/mbed_lib.json
index ca617b84a6..0d1204b13a 100644
--- a/features/storage/kvstore/conf/tdb_external_no_rbp/mbed_lib.json
+++ b/features/storage/kvstore/conf/tdb_external_no_rbp/mbed_lib.json
@@ -2,7 +2,7 @@
     "name": "storage_tdb_external_no_rbp",
     "config": {
         "blockdevice": {
-            "help": "Options are default, SPIF, DATAFASH, QSPIF or SD. If default the block device will be chosen by the defined component",
+            "help": "Options are default, SPIF, DATAFASH, QSPIF, SD or other. If default the block device will be chosen by the defined component. If other, override get_other_blockdevice() to support block device out of Mbed OS tree.",
             "value": "default"
         },
         "external_size": {