More EFM32 files and logic

14 files changed, 1098 insertions, 8 deletions

diff --git a/nuttx/arch/arm/src/efm32/Kconfig b/nuttx/arch/arm/src/efm32/Kconfig
index 631e52650..631e52650 100755..100644
--- a/nuttx/arch/arm/src/efm32/Kconfig
+++ b/nuttx/arch/arm/src/efm32/Kconfig
diff --git a/nuttx/arch/arm/src/efm32/Make.defs b/nuttx/arch/arm/src/efm32/Make.defs
new file mode 100644
index 000000000..b1526d343
--- /dev/null
+++ b/nuttx/arch/arm/src/efm32/Make.defs
@@ -0,0 +1,103 @@
+############################################################################
+# arch/arm/src/efm32/Make.defs
+#
+#   Copyright (C) 2014 Gregory Nutt. All rights reserved.
+#   Author: Gregory Nutt <gnutt@nuttx.org>
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+# 3. Neither the name NuttX nor the names of its contributors may be
+#    used to endorse or promote products derived from this software
+#    without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+############################################################################
+
+ifeq ($(CONFIG_ARMV7M_CMNVECTOR),y)
+HEAD_ASRC =
+else
+HEAD_ASRC = efm32_vectors.S
+endif
+
+CMN_UASRCS =
+CMN_UCSRCS =
+
+CMN_ASRCS  = up_saveusercontext.S up_fullcontextrestore.S up_switchcontext.S
+CMN_ASRCS += vfork.S
+
+CMN_CSRCS  = up_assert.c up_blocktask.c up_copyfullstate.c
+CMN_CSRCS += up_createstack.c up_mdelay.c up_udelay.c up_exit.c
+CMN_CSRCS += up_initialize.c up_initialstate.c up_interruptcontext.c
+CMN_CSRCS += up_memfault.c up_modifyreg8.c up_modifyreg16.c up_modifyreg32.c
+CMN_CSRCS += up_releasepending.c up_releasestack.c up_reprioritizertr.c
+CMN_CSRCS += up_schedulesigaction.c up_sigdeliver.c up_systemreset.c
+CMN_CSRCS += up_unblocktask.c up_usestack.c up_doirq.c up_hardfault.c
+CMN_CSRCS += up_svcall.c up_vfork.c
+CMN_CSRCS += up_allocateheap.c
+CMN_CSRCS += up_stackframe.c
+
+ifeq ($(CONFIG_ARMV7M_CMNVECTOR),y)
+CMN_ASRCS += up_exception.S
+CMN_CSRCS += up_vectors.c
+endif
+
+ifeq ($(CONFIG_ARCH_RAMVECTORS),y)
+CMN_CSRCS += up_ramvec_initialize.c up_ramvec_attach.c
+endif
+
+ifeq ($(CONFIG_ARCH_MEMCPY),y)
+CMN_ASRCS += up_memcpy.S
+endif
+
+ifeq ($(CONFIG_BUILD_PROTECTED),y)
+CMN_CSRCS += up_mpu.c up_task_start.c up_pthread_start.c
+ifneq ($(CONFIG_DISABLE_SIGNALS),y)
+CMN_CSRCS += up_signal_dispatch.c
+CMN_UASRCS += up_signal_handler.S
+endif
+endif
+
+ifeq ($(CONFIG_DEBUG_STACK),y)
+CMN_CSRCS += up_checkstack.c
+endif
+
+ifeq ($(CONFIG_ELF),y)
+CMN_CSRCS += up_elf.c
+endif
+
+ifeq ($(CONFIG_ARCH_FPU),y)
+CMN_ASRCS += up_fpu.S
+ifneq ($(CONFIG_ARMV7M_CMNVECTOR),y)
+CMN_CSRCS += up_copyarmstate.c
+endif
+endif
+
+CHIP_ASRCS  =
+CHIP_CSRCS  =
+
+CHIP_CSRCS += efm32_start.c
+
+ifneq ($(CONFIG_ARCH_IDLE_CUSTOM),y)
+CHIP_CSRCS += efm32_idle.c
+endif
+
diff --git a/nuttx/arch/arm/src/efm32/chip.h b/nuttx/arch/arm/src/efm32/chip.h
new file mode 100644
index 000000000..f7effac65
--- /dev/null
+++ b/nuttx/arch/arm/src/efm32/chip.h
@@ -0,0 +1,73 @@
+/************************************************************************************
+ * arch/arm/src/efm32/chip.h
+ *
+ *   Copyright (C) 2009, 2011-2014 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2014 Pierre-noel Bouteville . All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *           Pierre-noel Bouteville <pnb990@gmail.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************************************/
+
+#ifndef __ARCH_ARM_SRC_EFM32_CHIP_H
+#define __ARCH_ARM_SRC_EFM32_CHIP_H
+
+/************************************************************************************
+ * Included Files
+ ************************************************************************************/
+
+#include <nuttx/config.h>
+
+/* Include the chip capabilities file */
+
+#include <arch/efm32/chip.h>
+
+/* Include the chip pin configuration file */
+
+#ifdef CONFIG_ARMV7M_CMNVECTOR
+#  if defined(CONFIG_EFM32_EFM32TG)
+#    include "chip/efm32tg_vectors.h"
+#  elif defined(CONFIG_EFM32_EFM32G)
+#    include "chip/efm32g_vectors.h"
+#  elif defined(CONFIG_EFM32_EFM32GG)
+#    include "chip/efm32gg_vectors.h"
+#  else
+#    error "No vector file for this EFM32 family"
+#  endif
+#endif
+
+/* Include the chip memory map. */
+
+//#include "chip/efm32_memorymap.h"
+
+/************************************************************************************
+ * Pre-processor Definitions
+ ************************************************************************************/
+
+#endif /* __ARCH_ARM_SRC_EFM32_CHIP_H */
diff --git a/nuttx/arch/arm/src/efm32/chip/efm32g_vectors.h b/nuttx/arch/arm/src/efm32/chip/efm32g_vectors.h
new file mode 100644
index 000000000..40abe8d6d
--- /dev/null
+++ b/nuttx/arch/arm/src/efm32/chip/efm32g_vectors.h
@@ -0,0 +1,97 @@
+/*****************************************************************************
+ * arch/arm/src/efm32/chip/efm32ggxxx_vectors.h
+ *
+ *   Copyright (C) 2014 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ *****************************************************************************/
+
+/*****************************************************************************
+ * Pre-processor Definitions
+ *****************************************************************************/
+/* This file is included by efm32_vectors.S.  It provides the macro VECTOR
+ * that supplies each EFM32G vector in terms of a (lower-case) ISR label and
+ * an (upper-case) IRQ number as defined in arch/arm/include/efm32/efm32g_irq.h.
+ * efm32_vectors.S will defined the VECTOR in different ways in order to
+ * generate the interrupt vectors and handlers in their final form.
+ *
+ * Vectors for low and medium density devices
+ */
+
+#if defined(CONFIG_EFM32_EFM32G)
+
+/* If the common ARMv7-M vector handling is used, then all it needs is the
+ * following definition that provides the number of supported vectors.
+ */
+
+#ifdef CONFIG_ARMV7M_CMNVECTOR
+
+/* Reserve 30 interrupt table entries for I/O interrupts. */
+
+# define ARMV7M_PERIPHERAL_INTERRUPTS 30
+
+#else
+                                                      /* IRQ# Source      */
+  VECTOR(EFM32_IRQ_DMA,        EFM32_IRQ_DMA       ) /*  0   DMA         */
+  VECTOR(EFM32_IRQ_GPIO_EVEN,  EFM32_IRQ_GPIO_EVEN ) /*  1   GPIO_EVEN   */
+  VECTOR(EFM32_IRQ_TIMER0,     EFM32_IRQ_TIMER0    ) /*  2   TIMER0      */
+  VECTOR(EFM32_IRQ_USART0_RX,  EFM32_IRQ_USART0_RX ) /*  3   USART0_RX   */
+  VECTOR(EFM32_IRQ_USART0_TX,  EFM32_IRQ_USART0_TX ) /*  4   USART0_TX   */
+  VECTOR(EFM32_IRQ_ACMP,       EFM32_IRQ_ACMP      ) /*  5   ACMP0/ACMP1 */
+  VECTOR(EFM32_IRQ_ADC0,       EFM32_IRQ_ADC0      ) /*  6   ADC0        */
+  VECTOR(EFM32_IRQ_DAC0,       EFM32_IRQ_DAC0      ) /*  7   DAC0        */
+  VECTOR(EFM32_IRQ_I2C0,       EFM32_IRQ_I2C0      ) /*  8   I2C0        */
+  VECTOR(EFM32_IRQ_GPIO_ODD,   EFM32_IRQ_GPIO_ODD  ) /*  9   GPIO_ODD    */
+  VECTOR(EFM32_IRQ_TIMER1,     EFM32_IRQ_TIMER1    ) /* 10   TIMER1      */
+  VECTOR(EFM32_IRQ_TIMER2,     EFM32_IRQ_TIMER2    ) /* 11   TIMER2      */
+  VECTOR(EFM32_IRQ_USART1_RX,  EFM32_IRQ_USART1_RX ) /* 12   USART1_RX   */
+  VECTOR(EFM32_IRQ_USART1_TX,  EFM32_IRQ_USART1_TX ) /* 13   USART1_TX   */
+  VECTOR(EFM32_IRQ_USART2_RX,  EFM32_IRQ_USART2_RX ) /* 14   USART2_RX   */
+  VECTOR(EFM32_IRQ_USART2_TX,  EFM32_IRQ_USART2_TX ) /* 15   USART2_TX   */
+  VECTOR(EFM32_IRQ_UART0_RX,   EFM32_IRQ_UART0_RX  ) /* 16   UART0_RX    */
+  VECTOR(EFM32_IRQ_UART0_TX,   EFM32_IRQ_UART0_TX  ) /* 17   UART0_TX    */
+  VECTOR(EFM32_IRQ_LEUART0,    EFM32_IRQ_LEUART0   ) /* 18   LEUART0     */
+  VECTOR(EFM32_IRQ_LEUART1,    EFM32_IRQ_LEUART1   ) /* 19   LEUART1     */
+  VECTOR(EFM32_IRQ_LETIMER0,   EFM32_IRQ_LETIMER0  ) /* 20   LETIMER0    */
+  VECTOR(EFM32_IRQ_PCNT0,      EFM32_IRQ_PCNT0     ) /* 21   PCNT0       */
+  VECTOR(EFM32_IRQ_PCNT1,      EFM32_IRQ_PCNT1     ) /* 22   PCNT1       */
+  VECTOR(EFM32_IRQ_PCNT2,      EFM32_IRQ_PCNT2     ) /* 23   PCNT2       */
+  VECTOR(EFM32_IRQ_RTC,        EFM32_IRQ_RTC       ) /* 24   RTC         */
+  VECTOR(EFM32_IRQ_CMU,        EFM32_IRQ_CMU       ) /* 25   CMU         */
+  VECTOR(EFM32_IRQ_VCMP,       EFM32_IRQ_VCMP      ) /* 26   VCMP        */
+  VECTOR(EFM32_IRQ_LCD,        EFM32_IRQ_LCD       ) /* 27   LCD         */
+  VECTOR(EFM32_IRQ_MSC,        EFM32_IRQ_MSC       ) /* 28   MSC         */
+  VECTOR(EFM32_IRQ_AES,        EFM32_IRQ_AES       ) /* 29   AES         */
+
+#endif
+
+#else
+#  error "Unknown EFM32 Type"
+#endif
diff --git a/nuttx/arch/arm/src/efm32/chip/efm32gg_vectors.h b/nuttx/arch/arm/src/efm32/chip/efm32gg_vectors.h
new file mode 100644
index 000000000..891fd31dd
--- /dev/null
+++ b/nuttx/arch/arm/src/efm32/chip/efm32gg_vectors.h
@@ -0,0 +1,104 @@
+/*****************************************************************************
+ * arch/arm/src/efm32/chip/efm32ggxxx_vectors.h
+ *
+ *   Copyright (C) 2014 Pierre-noel Bouteville . All rights reserved.
+ *   Author: Pierre-noel Bouteville <pnb990@gmail.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ *****************************************************************************/
+
+/*****************************************************************************
+ * Pre-processor Definitions
+ *****************************************************************************/
+/* This file is included by efm32_vectors.S.  It provides the macro VECTOR
+ * that supplies each EFM32GG vector in terms of a (lower-case) ISR label and
+ * an (upper-case) IRQ number as defined in arch/arm/include/efm32/efm32gg_irq.h.
+ * efm32_vectors.S will defined the VECTOR in different ways in order to
+ * generate the interrupt vectors and handlers in their final form.
+ *
+ * Vectors for low and medium density devices
+ */
+
+#if defined(CONFIG_EFM32_EFM32GG)
+
+/* If the common ARMv7-M vector handling is used, then all it needs is the
+ * following definition that provides the number of supported vectors.
+ */
+
+#ifdef CONFIG_ARMV7M_CMNVECTOR
+
+/* Reserve 39 interrupt table entries for I/O interrupts. */
+
+# define ARMV7M_PERIPHERAL_INTERRUPTS 39
+
+#else
+  VECTOR(EFM32_IRQ_DMA,         EFM32_IRQ_DMA       ) /*  0: EFM32_IRQ_DMA          */
+  VECTOR(EFM32_IRQ_GPIO_EVEN,   EFM32_IRQ_GPIO_EVEN ) /*  1: EFM32_IRQ_GPIO_EVEN    */
+  VECTOR(EFM32_IRQ_TIMER0,      EFM32_IRQ_TIMER0    ) /*  2: EFM32_IRQ_TIMER0       */
+  VECTOR(EFM32_IRQ_USART0_RX,   EFM32_IRQ_USART0_RX ) /*  3: EFM32_IRQ_USART0_RX    */
+  VECTOR(EFM32_IRQ_USART0_TX,   EFM32_IRQ_USART0_TX ) /*  4: EFM32_IRQ_USART0_TX    */
+  VECTOR(EFM32_IRQ_USB,         EFM32_IRQ_USB       ) /*  5: EFM32_IRQ_USB          */
+  VECTOR(EFM32_IRQ_ACMP,        EFM32_IRQ_ACMP      ) /*  6: EFM32_IRQ_ACMP         */
+  VECTOR(EFM32_IRQ_ADC0,        EFM32_IRQ_ADC0      ) /*  7: EFM32_IRQ_ADC0         */
+  VECTOR(EFM32_IRQ_DAC0,        EFM32_IRQ_DAC0      ) /*  8: EFM32_IRQ_DAC0         */
+  VECTOR(EFM32_IRQ_I2C0,        EFM32_IRQ_I2C0      ) /*  9: EFM32_IRQ_I2C0         */
+  VECTOR(EFM32_IRQ_I2C1,        EFM32_IRQ_I2C1      ) /* 10: EFM32_IRQ_I2C1         */
+  VECTOR(EFM32_IRQ_GPIO_ODD,    EFM32_IRQ_GPIO_ODD  ) /* 11: EFM32_IRQ_GPIO_ODD     */
+  VECTOR(EFM32_IRQ_TIMER1,      EFM32_IRQ_TIMER1    ) /* 12: EFM32_IRQ_TIMER1       */
+  VECTOR(EFM32_IRQ_TIMER2,      EFM32_IRQ_TIMER2    ) /* 13: EFM32_IRQ_TIMER2       */
+  VECTOR(EFM32_IRQ_TIMER3,      EFM32_IRQ_TIMER3    ) /* 14: EFM32_IRQ_TIMER3       */
+  VECTOR(EFM32_IRQ_USART1_RX,   EFM32_IRQ_USART1_RX ) /* 15: EFM32_IRQ_USART1_RX    */
+  VECTOR(EFM32_IRQ_USART1_TX,   EFM32_IRQ_USART1_TX ) /* 16: EFM32_IRQ_USART1_TX    */
+  VECTOR(EFM32_IRQ_LESENSE,     EFM32_IRQ_LESENSE   ) /* 17: EFM32_IRQ_LESENSE      */
+  VECTOR(EFM32_IRQ_USART2_RX,   EFM32_IRQ_USART2_RX ) /* 18: EFM32_IRQ_USART2_RX    */
+  VECTOR(EFM32_IRQ_USART2_TX,   EFM32_IRQ_USART2_TX ) /* 19: EFM32_IRQ_USART2_TX    */
+  VECTOR(EFM32_IRQ_UART0_RX,    EFM32_IRQ_UART0_RX  ) /* 20: EFM32_IRQ_UART0_RX     */
+  VECTOR(EFM32_IRQ_UART0_TX,    EFM32_IRQ_UART0_TX  ) /* 21: EFM32_IRQ_UART0_TX     */
+  VECTOR(EFM32_IRQ_UART1_RX,    EFM32_IRQ_UART1_RX  ) /* 22: EFM32_IRQ_UART1_RX     */
+  VECTOR(EFM32_IRQ_UART1_TX,    EFM32_IRQ_UART1_TX  ) /* 23: EFM32_IRQ_UART1_TX     */
+  VECTOR(EFM32_IRQ_LEUART0,     EFM32_IRQ_LEUART0   ) /* 24: EFM32_IRQ_LEUART0      */
+  VECTOR(EFM32_IRQ_LEUART1,     EFM32_IRQ_LEUART1   ) /* 25: EFM32_IRQ_LEUART1      */
+  VECTOR(EFM32_IRQ_LETIMER0,    EFM32_IRQ_LETIMER0  ) /* 26: EFM32_IRQ_LETIMER0     */
+  VECTOR(EFM32_IRQ_PCNT0,       EFM32_IRQ_PCNT0     ) /* 27: EFM32_IRQ_PCNT0        */
+  VECTOR(EFM32_IRQ_PCNT1,       EFM32_IRQ_PCNT1     ) /* 28: EFM32_IRQ_PCNT1        */
+  VECTOR(EFM32_IRQ_PCNT2,       EFM32_IRQ_PCNT2     ) /* 29: EFM32_IRQ_PCNT2        */
+  VECTOR(EFM32_IRQ_RTC,         EFM32_IRQ_RTC       ) /* 30: EFM32_IRQ_RTC          */
+  VECTOR(EFM32_IRQ_BURTC,       EFM32_IRQ_BURTC     ) /* 31: EFM32_IRQ_BURTC        */
+  VECTOR(EFM32_IRQ_CMU,         EFM32_IRQ_CMU       ) /* 32: EFM32_IRQ_CMU          */
+  VECTOR(EFM32_IRQ_VCMP,        EFM32_IRQ_VCMP      ) /* 33: EFM32_IRQ_VCMP         */
+  VECTOR(EFM32_IRQ_LCD,         EFM32_IRQ_LCD       ) /* 34: EFM32_IRQ_LCD          */
+  VECTOR(EFM32_IRQ_MSC,         EFM32_IRQ_MSC       ) /* 35: EFM32_IRQ_MSC          */
+  VECTOR(EFM32_IRQ_AES,         EFM32_IRQ_AES       ) /* 36: EFM32_IRQ_AES          */
+  VECTOR(EFM32_IRQ_EBI,         EFM32_IRQ_EBI       ) /* 37: EFM32_IRQ_EBI          */
+  VECTOR(EFM32_IRQ_EMI,         EFM32_IRQ_EMI       ) /* 38: EFM32_IRQ_EMI          */
+#endif
+
+#else
+#  error "Unknown EFM32 Type"
+#endif
diff --git a/nuttx/arch/arm/src/efm32/chip/efm32tg_vectors.h b/nuttx/arch/arm/src/efm32/chip/efm32tg_vectors.h
new file mode 100644
index 000000000..b5e34e776
--- /dev/null
+++ b/nuttx/arch/arm/src/efm32/chip/efm32tg_vectors.h
@@ -0,0 +1,88 @@
+/*****************************************************************************
+ * arch/arm/src/efm32/chip/efm32tg_vectors.h
+ *
+ *   Copyright (C) 2014 Pierre-noel Bouteville . All rights reserved.
+ *   Author: Pierre-noel Bouteville <pnb990@gmail.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ *****************************************************************************/
+
+/*****************************************************************************
+ * Pre-processor Definitions
+ *****************************************************************************/
+/* This file is included by efm32_vectors.S.  It provides the macro VECTOR that
+ * supplies ach EFM32TG vector in terms of a (lower-case) ISR label and an
+ * (upper-case) IRQ number as defined in arch/arm/include/efm32/efm32tg_irq.h.
+ * efm32_vectors.S will defined the VECTOR in different ways in order to
+ * generate the interrupt vectors and handlers in their final form.
+ *
+ * Vectors for low and medium density devices
+ */
+
+#if defined(CONFIG_EFM32_EFM32TG)
+
+/* If the common ARMv7-M vector handling is used, then all it needs is the
+ * following definition that provides the number of supported vectors.
+ */
+
+#ifdef CONFIG_ARMV7M_CMNVECTOR
+
+/* Reserve 23 interrupt table entries for I/O interrupts. */
+
+# define ARMV7M_PERIPHERAL_INTERRUPTS 23
+
+#else
+  VECTOR(EFM32_IRQ_DMA,         EFM32_IRQ_DMA       ) /* 0: EFM32_IRQ_DMA */
+  VECTOR(EFM32_IRQ_GPIO_EVEN,   EFM32_IRQ_GPIO_EVEN ) /* 1: EFM32_IRQ_GPIO_EVEN */
+  VECTOR(EFM32_IRQ_TIMER0,      EFM32_IRQ_TIMER0    ) /* 2: EFM32_IRQ_TIMER0 */
+  VECTOR(EFM32_IRQ_USART0_RX,   EFM32_IRQ_USART0_RX ) /* 3: EFM32_IRQ_USART0_RX */
+  VECTOR(EFM32_IRQ_USART0_TX,   EFM32_IRQ_USART0_TX ) /* 4: EFM32_IRQ_USART0_TX */
+  VECTOR(EFM32_IRQ_ACMP,        EFM32_IRQ_ACMP      ) /* 5: EFM32_IRQ_ACMP */
+  VECTOR(EFM32_IRQ_ADC0,        EFM32_IRQ_ADC0      ) /* 6: EFM32_IRQ_ADC0 */
+  VECTOR(EFM32_IRQ_DAC0,        EFM32_IRQ_DAC0      ) /* 7: EFM32_IRQ_DAC0 */
+  VECTOR(EFM32_IRQ_I2C0,        EFM32_IRQ_I2C0      ) /* 8: EFM32_IRQ_I2C0 */
+  VECTOR(EFM32_IRQ_GPIO_ODD,    EFM32_IRQ_GPIO_ODD  ) /* 9: EFM32_IRQ_GPIO_ODD */
+  VECTOR(EFM32_IRQ_TIMER1,      EFM32_IRQ_TIMER1    ) /* 10: EFM32_IRQ_TIMER1 */
+  VECTOR(EFM32_IRQ_USART1_RX,   EFM32_IRQ_USART1_RX ) /* 11: EFM32_IRQ_USART1_RX */
+  VECTOR(EFM32_IRQ_USART1_TX,   EFM32_IRQ_USART1_TX ) /* 12: EFM32_IRQ_USART1_TX */
+  VECTOR(EFM32_IRQ_LESENSE,     EFM32_IRQ_LESENSE   ) /* 13: EFM32_IRQ_LESENSE */
+  VECTOR(EFM32_IRQ_LEUART0,     EFM32_IRQ_LEUART0   ) /* 14: EFM32_IRQ_LEUART0 */
+  VECTOR(EFM32_IRQ_LETIMER0,    EFM32_IRQ_LETIMER0  ) /* 15: EFM32_IRQ_LETIMER0 */
+  VECTOR(EFM32_IRQ_PCNT0,       EFM32_IRQ_PCNT0     ) /* 16: EFM32_IRQ_PCNT0 */
+  VECTOR(EFM32_IRQ_RTC,         EFM32_IRQ_RTC       ) /* 17: EFM32_IRQ_RTC */
+  VECTOR(EFM32_IRQ_CMU,         EFM32_IRQ_CMU       ) /* 18: EFM32_IRQ_CMU */
+  VECTOR(EFM32_IRQ_VCMP,        EFM32_IRQ_VCMP      ) /* 19: EFM32_IRQ_VCMP */
+  VECTOR(EFM32_IRQ_LCD,         EFM32_IRQ_LCD       ) /* 20: EFM32_IRQ_LCD */
+  VECTOR(EFM32_IRQ_MSC,         EFM32_IRQ_MSC       ) /* 21: EFM32_IRQ_MSC */
+  VECTOR(EFM32_IRQ_AES,         EFM32_IRQ_AES       ) /* 22: EFM32_IRQ_AES */
+#endif
+
+#else
+#  error "Unknown EFM32 Type"
+#endif
diff --git a/nuttx/arch/arm/src/efm32/efm32_clockconfig.h b/nuttx/arch/arm/src/efm32/efm32_clockconfig.h
new file mode 100644
index 000000000..64e2bf56b
--- /dev/null
+++ b/nuttx/arch/arm/src/efm32/efm32_clockconfig.h
@@ -0,0 +1,61 @@
+/****************************************************************************
+ * arch/arm/src/efm32/efm32_clockconfig.h
+ *
+ *   Copyright (C) 2014 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+#ifndef __ARCH_ARM_SRC_EFM32_EFM32_CLOCKCONFIG_H
+#define __ARCH_ARM_SRC_EFM32_EFM32_CLOCKCONFIG_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: efm32_clockconfig
+ *
+ * Description:
+ *   Called to initialize the EFM32.  This does whatever setup is needed to
+ *   put the SoC in a usable state.  This includes the initialization of
+ *   clocking using the settings in board.h.
+ *
+ ****************************************************************************/
+
+void efm32_clockconfig(void);
+
+#endif /* __ARCH_ARM_SRC_EFM32_EFM32_CLOCKCONFIG_H */
diff --git a/nuttx/arch/arm/src/efm32/efm32_idle.c b/nuttx/arch/arm/src/efm32/efm32_idle.c
new file mode 100644
index 000000000..7b525bbe3
--- /dev/null
+++ b/nuttx/arch/arm/src/efm32/efm32_idle.c
@@ -0,0 +1,96 @@
+/****************************************************************************
+ *  arch/arm/src/efm32/efm32_idle.c
+ *
+ *   Copyright (C) 2014 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <arch/board/board.h>
+#include <nuttx/config.h>
+
+#include <nuttx/arch.h>
+#include <nuttx/power/pm.h>
+
+#include <arch/irq.h>
+
+#include "chip.h"
+#include "up_internal.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/* Does the board support an IDLE LED to indicate that the board is in the
+ * IDLE state?
+ */
+
+#if defined(CONFIG_ARCH_LEDS) && defined(LED_IDLE)
+#  define BEGIN_IDLE() board_led_on(LED_IDLE)
+#  define END_IDLE()   board_led_off(LED_IDLE)
+#else
+#  define BEGIN_IDLE()
+#  define END_IDLE()
+#endif
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: up_idle
+ *
+ * Description:
+ *   up_idle() is the logic that will be executed when their is no other
+ *   ready-to-run task.  This is processor idle time and will continue until
+ *   some interrupt occurs to cause a context switch from the idle task.
+ *
+ *   Processing in this state may be processor-specific. e.g., this is where
+ *   power management operations might be performed.
+ *
+ ****************************************************************************/
+
+void up_idle(void)
+{
+  /* Perform IDLE mode power management */
+  /* Sleep until an interrupt occurs to save power. */
+}
diff --git a/nuttx/arch/arm/src/efm32/efm32_lowputc.h b/nuttx/arch/arm/src/efm32/efm32_lowputc.h
new file mode 100644
index 000000000..670ed9da7
--- /dev/null
+++ b/nuttx/arch/arm/src/efm32/efm32_lowputc.h
@@ -0,0 +1,66 @@
+/****************************************************************************
+ * arch/arm/src/efm32/efm32_lowputc.h
+ *
+ *   Copyright (C) 2014 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+#ifndef __ARCH_ARM_SRC_EFM32_EFM32_LOWPUTC_H
+#define __ARCH_ARM_SRC_EFM32_EFM32_LOWPUTC_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: efm32_lowsetup
+ *
+ * Description:
+ *   Called at the very beginning of _start.  Performs low level
+ *   initialization including setup of the console UART.  This UART done
+ *   early so that the serial console is available for debugging very early
+ *   in the boot sequence.
+ *
+ ****************************************************************************/
+
+#if defined(CONFIG_DEV_LOWCONSOLE) || defined(CONFIG_DEBUG)  
+void efm32_lowsetup(void);
+#else
+#  define efm32_lowsetup()
+#endif
+
+#endif /* __ARCH_ARM_SRC_EFM32_EFM32_LOWPUTC_H */
diff --git a/nuttx/arch/arm/src/efm32/efm32_start.c b/nuttx/arch/arm/src/efm32/efm32_start.c
new file mode 100644
index 000000000..1cc28e536
--- /dev/null
+++ b/nuttx/arch/arm/src/efm32/efm32_start.c
@@ -0,0 +1,205 @@
+/****************************************************************************
+ * arch/arm/src/efm32/efm32_start.c
+ *
+ *   Copyright (C) 2014 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdint.h>
+#include <assert.h>
+#include <debug.h>
+
+#include <nuttx/init.h>
+#include <arch/board/board.h>
+#include <arch/efm32/chip.h>
+
+#include "up_arch.h"
+#include "up_internal.h"
+#include "efm32_lowputc.h"
+#include "efm32_clockconfig.h"
+#include "efm32_start.h"
+
+/****************************************************************************
+ * Private Function prototypes
+ ****************************************************************************/
+
+#ifdef CONFIG_DEBUG_STACK
+static void go_os_start(void *pv, unsigned int nbytes)
+  __attribute__ ((naked,no_instrument_function,noreturn));
+#endif
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: showprogress
+ *
+ * Description:
+ *   Print a character on the UART to show boot status.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_DEBUG
+#  define showprogress(c) up_lowputc(c)
+#else
+#  define showprogress(c)
+#endif
+
+/****************************************************************************
+ * Name: go_os_start
+ *
+ * Description:
+ *   Set the IDLE stack to the
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_DEBUG_STACK
+static void go_os_start(void *pv, unsigned int nbytes)
+{
+  /* Set the IDLE stack to the stack coloration value then jump to
+   * os_start().  We take extreme care here because were currently
+   * executing on this stack.
+   *
+   * We want to avoid sneak stack access generated by the compiler.
+   */
+
+  __asm__ __volatile__
+  (
+    "\tmov  r1, r1, lsr #2\n"   /* R1 = nwords = nbytes >> 2 */
+    "\tbeq  2f\n"               /* (should not happen) */
+
+    "\tbic  r0, r0, #3\n"       /* R0 = Aligned stackptr */
+    "\tmovw r2, #0xbeef\n"      /* R2 = STACK_COLOR = 0xdeadbeef */
+    "\tmovt r2, #0xdead\n"
+
+    "1:\n"                      /* Top of the loop */
+    "\tsub  r1, r1, #1\n"       /* R1 nwords-- */
+    "\tcmp  r1, #0\n"           /* Check (nwords == 0) */
+    "\tstr  r2, [r0], #4\n"     /* Save stack color word, increment stackptr */
+    "\tbne  1b\n"               /* Bottom of the loop */
+
+    "2:\n"
+    "\tmov  r14, #0\n"          /* LR = return address (none) */
+    "\tb    os_start\n"         /* Branch to os_start */
+  );
+}
+#endif
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: _start
+ *
+ * Description:
+ *   This is the reset entry point.
+ *
+ ****************************************************************************/
+
+void __start(void)
+{
+  const uint32_t *src;
+  uint32_t *dest;
+
+  /* Configure the uart so that we can get debug output as soon as possible */
+
+  efm32_clockconfig();
+  efm32_lowsetup();
+  showprogress('A');
+
+  /* Clear .bss.  We'll do this inline (vs. calling memset) just to be
+   * certain that there are no issues with the state of global variables.
+   */
+
+  for (dest = &_sbss; dest < &_ebss; )
+    {
+      *dest++ = 0;
+    }
+
+  showprogress('B');
+
+  /* Move the initialized data section from his temporary holding spot in
+   * FLASH into the correct place in SRAM.  The correct place in SRAM is
+   * give by _sdata and _edata.  The temporary location is in FLASH at the
+   * end of all of the other read-only data (.text, .rodata) at _eronly.
+   */
+
+  for (src = &_eronly, dest = &_sdata; dest < &_edata; )
+    {
+      *dest++ = *src++;
+    }
+
+  showprogress('C');
+
+  /* Perform early serial initialization */
+
+  up_earlyserialinit();
+
+  showprogress('D');
+
+  /* For the case of the separate user-/kernel-space build, perform whatever
+   * platform specific initialization of the user memory is required.
+   * Normally this just means initializing the user space .data and .bss
+   * segments.
+   */
+
+#ifdef CONFIG_NUTTX_KERNEL
+  efm32_userspace();
+  showprogress('E');
+#endif
+
+  /* Then start NuttX */
+
+  showprogress('\r');
+  showprogress('\n');
+
+#ifdef CONFIG_DEBUG_STACK
+  /* Set the IDLE stack to the coloration value and jump into os_start() */
+
+  go_os_start((FAR void *)&_ebss, CONFIG_IDLETHREAD_STACKSIZE);
+#else
+  /* Call os_start() */
+
+  os_start();
+
+  /* Shouldn't get here */
+
+  for(;;);
+#endif
+}
diff --git a/nuttx/arch/arm/src/efm32/efm32_start.h b/nuttx/arch/arm/src/efm32/efm32_start.h
new file mode 100644
index 000000000..8b73d92f2
--- /dev/null
+++ b/nuttx/arch/arm/src/efm32/efm32_start.h
@@ -0,0 +1,61 @@
+/****************************************************************************
+ * arch/arm/src/efm32/efm32_start.h
+ *
+ *   Copyright (C) 2014 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+#ifndef __ARCH_ARM_SRC_EFM32_EFM32_START_H
+#define __ARCH_ARM_SRC_EFM32_EFM32_START_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: efm32_boardinitialize
+ *
+ * Description:
+ *   All EFM32 architectures must provide the following entry point.  This
+ *   entry point is called early in the initialization before any devices
+ *   have been initialized.
+ *
+ ****************************************************************************/
+
+void efm32_boardinitialize(void);
+
+#endif /* __ARCH_ARM_SRC_EFM32_EFM32_START_H */
diff --git a/nuttx/configs/efm32-g8xx-stk/README.txt b/nuttx/configs/efm32-g8xx-stk/README.txt
index 46fa9400d..ed375c1c5 100644
--- a/nuttx/configs/efm32-g8xx-stk/README.txt
+++ b/nuttx/configs/efm32-g8xx-stk/README.txt
@@ -14,3 +14,73 @@ README
     • Reset button and a switch to disconnect the battery.
     • On-board SEGGER J-Link USB emulator
     •   ARM 20 pin JTAG/SWD standard Debug in/out connector
+
+LEDs
+====
+
+  The EFM32 Gecko Start Kithas four yellow LEDs.  These LEDs are not used by
+  the board port unless CONFIG_ARCH_LEDS is defined.  In that case, the
+  usage by the board port is defined in include/board.h and src/efm32_autoleds.c.
+  The LEDs are used to encode OS-related events as follows:
+
+    SYMBOL             Meaning                 LED1*  LED2   LED3   LED4
+    ----------------- -----------------------  ------ -----  -----  ------
+    LED_STARTED       NuttX has been started   ON     OFF    OFF    OFF
+    LED_HEAPALLOCATE  Heap has been allocated  OFF    ON     OFF    OFF
+    LED_IRQSENABLED   Interrupts enabled       ON     ON     OFF    OFF
+    LED_STACKCREATED  Idle stack created       OFF    OFF    ON     OFF
+    LED_INIRQ         In an interrupt**        ON     N/C    N/C    OFF
+    LED_SIGNAL        In a signal handler***   N/C    ON     N/C    OFF
+    LED_ASSERTION     An assertion failed      ON     ON     N/C    OFF
+    LED_PANIC         The system has crashed   N/C    N/C    N/C    ON
+    LED_IDLE          STM32 is is sleep mode   (Optional, not used)
+
+  * If LED1, LED2, LED3 are statically on, then NuttX probably failed to boot
+    and these LEDs will give you some indication of where the failure was
+ ** The normal state is LED3 ON and LED1 faintly glowing.  This faint glow
+    is because of timer interrupt that result in the LED being illuminated
+    on a small proportion of the time.
+*** LED2 may also flicker normally if signals are processed.
+
+Configurations
+==============
+  Each EFM32 Gecko Starter Kit configuration is maintained in a sub-director
+  and can be selected as follow:
+
+    cd tools
+    ./configure.sh efm32-g8xx-stk/<subdir>
+    cd -
+    . ./setenv.sh
+
+  If this is a Windows native build, then configure.bat should be used
+  instead of configure.sh:
+
+    configure.bat STM32F4Discovery\<subdir>
+
+  Where <subdir> is one of the following:
+
+  nsh:
+  ---
+    Configures the NuttShell (nsh) located at apps/examples/nsh.  The
+    Configuration enables the serial interfaces on USARTx.  Support for
+    builtin applications is enabled, but in the base configuration no
+    builtin applications are selected (see NOTES below).
+
+    NOTES:
+
+    1. This configuration uses the mconf-based configuration tool.  To
+       change this configuration using that tool, you should:
+
+       a. Build and install the kconfig-mconf tool.  See nuttx/README.txt
+          and misc/tools/
+
+       b. Execute 'make menuconfig' in nuttx/ in order to start the
+          reconfiguration process.
+
+    2. By default, this configuration uses the CodeSourcery toolchain
+       for Windows and builds under Cygwin (or probably MSYS).  That
+       can easily be reconfigured, of course.
+
+       CONFIG_HOST_WINDOWS=y                   : Builds under Windows
+       CONFIG_WINDOWS_CYGWIN=y                 : Using Cygwin
+       CONFIG_ARMV7M_TOOLCHAIN_CODESOURCERYW=y : CodeSourcery for Windows
diff --git a/nuttx/configs/efm32-g8xx-stk/include/board.h b/nuttx/configs/efm32-g8xx-stk/include/board.h
index ddc32d070..eb2bb574f 100644
--- a/nuttx/configs/efm32-g8xx-stk/include/board.h
+++ b/nuttx/configs/efm32-g8xx-stk/include/board.h
@@ -40,8 +40,72 @@
  * Included Files
  ****************************************************************************/
 
+#include <nuttx/config.h>
+
+#include <stdbool.h>
+
+/****************************************************************************
+ * Pre-Processor Definitions
+ ****************************************************************************/
+/* The EFM32 Gecko Starter Kit supports 4 yellow LEDs.  One side is grounded
+ * so these LEDs are illuminated by outputting a high value.
+ *
+ * If CONFIG_ARCH_LEDS is not defined, then the user can control the LEDs in
+ * any way.  The following definitions are used to access individual LEDs.
+ */
+
+/* LED index values for use with efm32_setled() */
+
+#define BOARD_LED1        0
+#define BOARD_LED2        1
+#define BOARD_LED3        2
+#define BOARD_LED4        3
+#define BOARD_NLEDS       4
+
+#define BOARD_LED_GREEN   BOARD_LED1
+#define BOARD_LED_ORANGE  BOARD_LED2
+#define BOARD_LED_RED     BOARD_LED3
+#define BOARD_LED_BLUE    BOARD_LED4
+
+/* LED bits for use with efm32_setleds() */
+
+#define BOARD_LED1_BIT    (1 << BOARD_LED1)
+#define BOARD_LED2_BIT    (1 << BOARD_LED2)
+#define BOARD_LED3_BIT    (1 << BOARD_LED3)
+#define BOARD_LED4_BIT    (1 << BOARD_LED4)
+
+/* If CONFIG_ARCH_LEDs is defined, then NuttX will control the 4 LEDs on
+ * board the EFM32 Gecko Starter Kit.  The following definitions describe
+ * how NuttX controls the LEDs in this configuration:
+ */
+
+#define LED_STARTED       0  /* LED1 */
+#define LED_HEAPALLOCATE  1  /* LED2 */
+#define LED_IRQSENABLED   2  /* LED1 + LED2 */
+#define LED_STACKCREATED  3  /* LED3 */
+#define LED_INIRQ         4  /* LED1 + LED3 */
+#define LED_SIGNAL        5  /* LED2 + LED3 */
+#define LED_ASSERTION     6  /* LED1 + LED2 + LED3 */
+#define LED_PANIC         7  /* N/C  + N/C  + N/C + LED4 */
+
 /****************************************************************************
  * Public Function Prototypes
  ****************************************************************************/
 
+/****************************************************************************
+ * Name:  efm32_ledinit, efm32_setled, and efm32_setleds
+ *
+ * Description:
+ *   If CONFIG_ARCH_LEDS is defined, then NuttX will control the on-board
+ *   LEDs.  If CONFIG_ARCH_LEDS is not defined, then the following interfaces
+ *   are available to control the LEDs from user applications.
+ *
+ ****************************************************************************/
+
+#ifndef CONFIG_ARCH_LEDS
+void efm32_ledinit(void);
+void efm32_setled(int led, bool ledon);
+void efm32_setleds(uint8_t ledset);
+#endif
+
 #endif /* __CONFIGS_EFM32_DK3650_INCLUDE_BOARD_H */
diff --git a/nuttx/configs/efm32-g8xx-stk/src/efm32_boot.c b/nuttx/configs/efm32-g8xx-stk/src/efm32_boot.c
index ebe9ad0df..b288be27b 100644
--- a/nuttx/configs/efm32-g8xx-stk/src/efm32_boot.c
+++ b/nuttx/configs/efm32-g8xx-stk/src/efm32_boot.c
@@ -1,8 +1,8 @@
 /*****************************************************************************
- * configs/efm32-dk3650/src/efm32_boot.c
+ * configs/efm32-g8xx-stk/src/efm32_boot.c
  *
- *   Copyright (C) 2014 Richard Cochran. All rights reserved.
- *   Author: Richard Cochran <richardcochran@gmail.com>
+ *   Copyright (C) 2014 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -39,21 +39,23 @@
 
 #include <nuttx/config.h>
 
+#include "efm32_start.h"
+
 #include "efm32-g8xx-stk.h"
 
 /****************************************************************************
  * Public Functions
  ****************************************************************************/
 
-/************************************************************************************
+/****************************************************************************
  * Name: efm32_boardinitialize
  *
  * Description:
- *   All STM32 architectures must provide the following entry point.  This entry point
- *   is called early in the initialization -- after all memory has been configured
- *   and mapped but before any devices have been initialized.
+ *   All EFM32 architectures must provide the following entry point.  This
+ *   entry point is called early in the initialization before any devices
+ *   have been initialized.
  *
- ************************************************************************************/
+ ****************************************************************************/
 
 void efm32_boardinitialize(void)
 {