diff --git a/examples/mbed/mbed-blink/platformio.ini b/examples/mbed/mbed-blink/platformio.ini
index b6a88e91..306e976c 100644
--- a/examples/mbed/mbed-blink/platformio.ini
+++ b/examples/mbed/mbed-blink/platformio.ini
@@ -47,3 +47,9 @@ board = nucleo_f401re
 platform = teensy
 framework = mbed
 board = teensy31
+
+# Silicon Labs EFM32 Platform
+[env:siliconlabsefm32]
+platform = siliconlabsefm32
+framework = mbed
+board = efm32hg_stk3400
diff --git a/platformio/boards/siliconlabsefm32.json b/platformio/boards/siliconlabsefm32.json
new file mode 100644
index 00000000..dfa58584
--- /dev/null
+++ b/platformio/boards/siliconlabsefm32.json
@@ -0,0 +1,86 @@
+{
+    "efm32wg_stk3800": {
+        "build": {
+            "f_cpu": "48000000L",
+            "cpu": "cortex-m4",
+            "mcu": "efm32wg990f256"
+        },
+        "frameworks": ["mbed"],
+        "name": "Silicon Labs EFM32WG-STK3800 (Wonder Gecko)",
+        "platform": "siliconlabsefm32",
+        "upload": {
+            "maximum_ram_size": 32768,
+            "maximum_size": 262144
+        },
+        "url": "https://developer.mbed.org/platforms/EFM32-Wonder-Gecko/",
+        "vendor": "Silicon Labs"
+    },
+
+    "efm32gg_stk3700": {
+        "build": {
+            "f_cpu": "48000000L",
+            "cpu": "cortex-m3",
+            "mcu": "efm32gg990f1024"
+        },
+        "frameworks": ["mbed"],
+        "name": "Silicon Labs EFM32GG-STK3700 (Giant Gecko)",
+        "platform": "siliconlabsefm32",
+        "upload": {
+            "maximum_ram_size": 131072,
+            "maximum_size": 1048576
+        },
+        "url": "https://developer.mbed.org/platforms/EFM32-Giant-Gecko/",
+        "vendor": "Silicon Labs"
+    },
+
+    "efm32lg_stk3600": {
+        "build": {
+            "f_cpu": "48000000L",
+            "cpu": "cortex-m3",
+            "mcu": "efm32lg990f256"
+        },
+        "frameworks": ["mbed"],
+        "name": "Silicon Labs EFM32LG-STK3600 (Leopard Gecko)",
+        "platform": "siliconlabsefm32",
+        "upload": {
+            "maximum_ram_size": 32768,
+            "maximum_size": 262144
+        },
+        "url": "https://developer.mbed.org/platforms/EFM32-Leopard-Gecko/",
+        "vendor": "Silicon Labs"
+    },
+
+    "efm32zg_stk3200": {
+        "build": {
+            "f_cpu": "24000000L",
+            "cpu": "cortex-m0plus",
+            "mcu": "efm2zg222f32"
+        },
+        "frameworks": ["mbed"],
+        "name": "Silicon Labs EFM32ZG-STK3200 (Zero Gecko)",
+        "platform": "siliconlabsefm32",
+        "upload": {
+            "maximum_ram_size": 4096,
+            "maximum_size": 32768
+        },
+        "url": "https://developer.mbed.org/platforms/EFM32-Zero-Gecko/",
+        "vendor": "Silicon Labs"
+    },
+
+    "efm32hg_stk3400": {
+        "build": {
+            "f_cpu": "24000000L",
+            "cpu": "cortex-m3",
+            "mcu": "efm32hg322f64"
+        },
+        "frameworks": ["mbed"],
+        "name": "Silicon Labs SLSTK3400A USB-enabled (Happy Gecko)",
+        "platform": "siliconlabsefm32",
+        "upload": {
+            "maximum_ram_size": 8192,
+            "maximum_size": 65536
+        },
+        "url": "https://developer.mbed.org/platforms/EFM32-Happy-Gecko/",
+        "vendor": "Silicon Labs"
+    }
+}
diff --git a/platformio/builder/scripts/siliconlabsefm32.py b/platformio/builder/scripts/siliconlabsefm32.py
new file mode 100644
index 00000000..29692f6f
--- /dev/null
+++ b/platformio/builder/scripts/siliconlabsefm32.py
@@ -0,0 +1,50 @@
+# Copyright (C) Ivan Kravets <me@ikravets.com>
+# See LICENSE for details.
+
+"""
+    Builder for Silicon Labs EFM32 series ARM microcontrollers.
+"""
+
+from os.path import join
+
+from SCons.Script import (COMMAND_LINE_TARGETS, AlwaysBuild, Default,
+                          DefaultEnvironment, SConscript)
+
+env = DefaultEnvironment()
+
+SConscript(env.subst(join("$PIOBUILDER_DIR", "scripts", "basearm.py")))
+
+#
+# Target: Build executable and linkable firmware
+#
+
+target_elf = env.BuildFirmware()
+
+#
+# Target: Build the .bin file
+#
+
+if "uploadlazy" in COMMAND_LINE_TARGETS:
+    target_firm = join("$BUILD_DIR", "firmware.bin")
+else:
+    target_firm = env.ElfToBin(join("$BUILD_DIR", "firmware"), target_elf)
+
+#
+# Target: Print binary size
+#
+
+target_size = env.Alias("size", target_elf, "$SIZEPRINTCMD")
+AlwaysBuild(target_size)
+
+#
+# Target: Upload by default .bin file
+#
+
+upload = env.Alias(["upload", "uploadlazy"], target_firm, env.UploadToDisk)
+AlwaysBuild(upload)
+
+#
+# Target: Define targets
+#
+
+Default([target_firm, target_size])
diff --git a/platformio/platforms/siliconlabsefm32.py b/platformio/platforms/siliconlabsefm32.py
new file mode 100644
index 00000000..a39f7fb7
--- /dev/null
+++ b/platformio/platforms/siliconlabsefm32.py
@@ -0,0 +1,36 @@
+# Copyright (C) Ivan Kravets <me@ikravets.com>
+# See LICENSE for details.
+
+from platformio.platforms.base import BasePlatform
+
+
+class Siliconlabsefm32Platform(BasePlatform):
+
+    """
+    Silicon Labs EFM32 Gecko 32-bit microcontroller (MCU) family includes
+    devices that offer flash memory configurations up to 256 kB, 32 kB of
+    RAM and CPU speeds up to 48 MHz.
+
+    Based on the powerful ARM Cortex-M core, the Gecko family features
+    innovative low energy techniques, short wake-up time from energy saving
+    modes and a wide selection of peripherals, making it ideal for battery
+    operated applications and other systems requiring high performance and
+    low-energy consumption.
+
+    http://www.silabs.com/products/mcu/32-bit/efm32-gecko/Pages/efm32-gecko.aspx
+    """
+
+    PACKAGES = {
+
+        "toolchain-gccarmnoneeabi": {
+            "alias": "toolchain",
+            "default": True
+        },
+
+        "framework-mbed": {
+            "default": True
+        }
+    }
+
+    def get_name(self):
+        return "Silicon Labs EFM32"