diff --git a/platformio/boards/nordicnrf51.json b/platformio/boards/nordicnrf51.json
index c76c1609..beaedcd9 100644
--- a/platformio/boards/nordicnrf51.json
+++ b/platformio/boards/nordicnrf51.json
@@ -126,5 +126,21 @@
         },
         "url": "http://developer.mbed.org/platforms/Seeed-Tiny-BLE/",
         "vendor": "SeeedStudio"
+    },
+    "dfcm_nnn40": {
+        "build": {
+            "f_cpu": "32000000L",
+            "cpu": "cortex-m0",
+            "mcu": "nrf51822"
+        },
+        "frameworks": ["mbed"],
+        "name": "Delta DFCM-NNN40",
+        "platform": "nordicnrf51",
+        "upload": {
+            "maximum_ram_size": 32768,
+            "maximum_size": 262144
+        },
+        "url": "https://developer.mbed.org/platforms/Delta-DFCM-NNN40/",
+        "vendor": "Delta"
     }
-}
\ No newline at end of file
+}
diff --git a/platformio/boards/ststm32.json b/platformio/boards/ststm32.json
index a5fd3475..e57d9452 100644
--- a/platformio/boards/ststm32.json
+++ b/platformio/boards/ststm32.json
@@ -390,5 +390,37 @@
         },
         "url": "http://docs.armstrap.org/en/latest/hardware-overview.html",
         "vendor": "Armstrap"
+    },
+    "disco_l053c8": {
+        "build": {
+            "f_cpu": "32000000L",
+            "cpu": "cortex-m0plus",
+            "mcu": "stm32l053c8t6"
+        },
+        "frameworks": ["mbed"],
+        "name": "ST 32L0538DISCOVERY",
+        "platform": "ststm32",
+        "upload": {
+            "maximum_ram_size": 8192,
+            "maximum_size": 65536
+        },
+        "url": "http://www.st.com/web/en/catalog/tools/PF260319",
+        "vendor": "ST"
+    },
+    "disco_f334c8": {
+        "build": {
+            "f_cpu": "72000000L",
+            "cpu": "cortex-m4",
+            "mcu": "stm32f334c8t6"
+        },
+        "frameworks": ["mbed"],
+        "name": "ST 32F3348DISCOVERY",
+        "platform": "ststm32",
+        "upload": {
+            "maximum_ram_size": 12288,
+            "maximum_size": 65536
+        },
+        "url": "http://www.st.com/web/en/catalog/tools/PF260318",
+        "vendor": "ST"
     }
-}
\ No newline at end of file
+}
diff --git a/platformio/builder/scripts/frameworks/mbed.py b/platformio/builder/scripts/frameworks/mbed.py
index e9e57ad0..6c3bcf8d 100644
--- a/platformio/builder/scripts/frameworks/mbed.py
+++ b/platformio/builder/scripts/frameworks/mbed.py
@@ -32,9 +32,6 @@ env.Replace(
 )
 
 MBED_VARIANTS = {
-    "stm32f3discovery": "DISCO_F303VC",
-    "stm32f4discovery": "DISCO_F407VG",
-    "stm32f429discovery": "DISCO_F429ZI",
     "blueboard_lpc11u24": "LPC11U24",
     "dipcortexm0": "LPC11U24",
     "seeeduinoArchPro": "ARCH_PRO",
@@ -54,7 +51,8 @@ MBED_VARIANTS = {
     "frdm_kl05z": "KL05Z",
     "frdm_k20d50m": "K20D50M",
     "frdm_k22f": "K22F",
-    "teensy31": "TEENSY3_1"
+    "teensy31": "TEENSY3_1",
+    "dfcm_nnn40": "DELTA_DFCM_NNN40"
 }
 
 MBED_LIBS_MAP = {