diff --git a/boards/sltb001a/Makefile b/boards/sltb001a/Makefile
new file mode 100644
index 0000000000000000000000000000000000000000..6529affda2c2065cb0ff6ffba3551af45ad0cbb6
--- /dev/null
+++ b/boards/sltb001a/Makefile
@@ -0,0 +1,4 @@
+# tell the Makefile.base which module to build
+MODULE = board
+
+include $(RIOTBASE)/Makefile.base
diff --git a/boards/sltb001a/Makefile.dep b/boards/sltb001a/Makefile.dep
new file mode 100644
index 0000000000000000000000000000000000000000..351a0725e802f892aebf27db27eb101ff0cd91c8
--- /dev/null
+++ b/boards/sltb001a/Makefile.dep
@@ -0,0 +1,10 @@
+ifneq (,$(filter saul_default,$(USEMODULE)))
+ USEMODULE += saul_gpio
+ USEMODULE += bmp280
+ USEMODULE += si7021
+endif
+
+# i2c is required for environmental sensors
+USEMODULE += periph_i2c
+
+include $(RIOTCPU)/efr32mg1p/Makefile.dep
diff --git a/boards/sltb001a/Makefile.features b/boards/sltb001a/Makefile.features
new file mode 100644
index 0000000000000000000000000000000000000000..7fb29867eed9d8490f1a869aa892b1f24e365b8e
--- /dev/null
+++ b/boards/sltb001a/Makefile.features
@@ -0,0 +1,14 @@
+# Put defined MCU peripherals here (in alphabetical order)
+FEATURES_PROVIDED += periph_adc
+FEATURES_PROVIDED += periph_gpio
+FEATURES_PROVIDED += periph_i2c
+FEATURES_PROVIDED += periph_rtc
+FEATURES_PROVIDED += periph_rtt
+FEATURES_PROVIDED += periph_spi
+FEATURES_PROVIDED += periph_timer
+FEATURES_PROVIDED += periph_uart
+
+# The board MPU family (used for grouping by the CI system)
+FEATURES_MCU_GROUP = cortex_m4_2
+
+include $(RIOTCPU)/efr32mg1p/Makefile.features
diff --git a/boards/sltb001a/Makefile.include b/boards/sltb001a/Makefile.include
new file mode 100644
index 0000000000000000000000000000000000000000..2b891d80f96f4d0f7fd39085f274501318eb3c18
--- /dev/null
+++ b/boards/sltb001a/Makefile.include
@@ -0,0 +1,14 @@
+# define the cpu used by SLTB001A
+export CPU = efr32mg1p
+export CPU_MODEL = efr32mg1p132f256gm48
+
+# set default port depending on operating system
+PORT_LINUX ?= /dev/ttyACM0
+PORT_DARWIN ?= $(firstword $(sort $(wildcard /dev/tty.usbmodem*)))
+
+# setup JLink for flashing
+export JLINK_DEVICE := EFR32MG1PxxxF256
+include $(RIOTMAKE)/tools/jlink.inc.mk
+
+# setup serial terminal
+include $(RIOTMAKE)/tools/serial.inc.mk
diff --git a/boards/sltb001a/board.c b/boards/sltb001a/board.c
new file mode 100644
index 0000000000000000000000000000000000000000..c4ec0fe0f9b2e9dadf2e5f75bcda794c2bd08d34
--- /dev/null
+++ b/boards/sltb001a/board.c
@@ -0,0 +1,110 @@
+/*
+ * Copyright (C) 2015-2017 Freie Universität Berlin
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @ingroup boards_sltb001a
+ * @{
+ *
+ * @file
+ * @brief Board specific implementations SLTB001A board
+ *
+ * @author Hauke Petersen <hauke.petersen@fu-berlin.de>
+ * @author Bas Stottelaar <basstottelaar@gmail.com>
+ *
+ * @}
+ */
+
+#include "board.h"
+#include "cpu.h"
+
+#include "periph/gpio.h"
+#include "periph/i2c.h"
+
+#if BMP280_ENABLED || CCS811_ENABLED || ICM_20648_ENABLED || \
+ SI1133_ENABLED || SI7021_ENABLED || SI7210A_ENABLED || \
+ RGB_LED1_ENABLED || RGB_LED2_ENABLED || RGB_LED3_ENABLED || \
+ RGB_LED4_ENABLED
+static inline void board_usleep(uint32_t delay)
+{
+ /* decrement + compare take two cycles, therefore divide by two */
+ uint32_t count = (delay * (SystemCoreClock / 1000 / 1000)) / 2;
+
+ while (count--) {}
+}
+
+static void board_pic_init(void)
+{
+ gpio_init(PIC_INT_WAKE_PIN, GPIO_OD);
+ gpio_set(PIC_INT_WAKE_PIN);
+
+ i2c_init_master(PIC_I2C, I2C_SPEED_NORMAL);
+}
+
+static void board_pic_write(uint8_t addr, uint8_t value)
+{
+ /* toggle the pin for 4 us */
+ gpio_clear(PIC_INT_WAKE_PIN);
+ board_usleep(4);
+
+ /* write to gpio expander */
+ i2c_acquire(PIC_I2C);
+ uint8_t bytes[] = { addr, value };
+ i2c_write_bytes(PIC_I2C, PIC_I2C_ADDR, bytes, 2);
+ i2c_release(PIC_I2C);
+
+ /* put PIC in sleep mode again */
+ gpio_set(PIC_INT_WAKE_PIN);
+}
+#endif
+
+void board_init(void)
+{
+ /* initialize the CPU */
+ cpu_init();
+
+ /* initialize the LEDs */
+ gpio_init(LED0_PIN, GPIO_OUT);
+ gpio_init(LED1_PIN, GPIO_OUT);
+
+ /* initialize the push buttons */
+ gpio_init(PB0_PIN, GPIO_IN);
+ gpio_init(PB1_PIN, GPIO_IN);
+
+ /* initialize the environmental sensors (multiple ones) */
+#if BMP280_ENABLED || CCS811_ENABLED || ICM_20648_ENABLED || \
+ SI1133_ENABLED || SI7021_ENABLED || SI7210A_ENABLED || \
+ RGB_LED1_ENABLED || RGB_LED2_ENABLED || RGB_LED3_ENABLED || \
+ RGB_LED4_ENABLED
+ board_pic_init();
+#endif
+
+ /* enable the CCS811 air quality/gas sensor */
+#if CCS811_ENABLED
+ board_pic_write(CCS811_PIC_ADDR, (1 << CCS811_PIC_EN_BIT) | (1 << CCS811_PIC_WAKE_BIT));
+#endif
+
+ /* enable the IMU sensor */
+#if ICM_20648_ENABLED
+ board_pic_write(ICM20648_PIC_ADDR, 1 << ICM20648_PIC_EN_BIT);
+#endif
+
+ /* enable the environmental sensors */
+#if BMP280_ENABLED || SI1133_ENABLED || SI7021_ENABLED || SI7210A_ENABLED
+ board_pic_write(ENV_SENSE_PIC_ADDR, 1 << ENV_SENSE_PIC_BIT);
+#endif
+
+ /* enable the RGB leds */
+#if RGB_LED1_ENABLED || RGB_LED2_ENABLED || RGB_LED3_ENABLED || RGB_LED4_ENABLED
+ board_pic_write(RGB_LED_ADDR,
+ (1 << RGB_LED_EN_BIT) |
+ (RGB_LED1_ENABLED << RGB_LED1_EN_BIT) |
+ (RGB_LED2_ENABLED << RGB_LED2_EN_BIT) |
+ (RGB_LED3_ENABLED << RGB_LED3_EN_BIT) |
+ (RGB_LED4_ENABLED << RGB_LED4_EN_BIT));
+#endif
+}
diff --git a/boards/sltb001a/include/board.h b/boards/sltb001a/include/board.h
new file mode 100644
index 0000000000000000000000000000000000000000..4fd5322b9748f0a6d06bc3d2d3096d8270714dad
--- /dev/null
+++ b/boards/sltb001a/include/board.h
@@ -0,0 +1,212 @@
+/*
+ * Copyright (C) 2015-2017 Freie Universität Berlin
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @defgroup boards_sltb001a Silicon Labs SLTB001A starter kit
+ * @ingroup boards
+ * @brief Support for the Silicon Labs SLTB001A starter kit
+ * @{
+ *
+ * @file
+ * @brief Board specific definitions for the SLTB001A starter kit
+ *
+ * @author Hauke Petersen <hauke.petersen@fu-berlin.de>
+ * @author Bas Stottelaar <basstottelaar@gmail.com>
+ */
+
+#ifndef BOARD_H
+#define BOARD_H
+
+#include "cpu.h"
+
+#include "periph_conf.h"
+#include "periph/gpio.h"
+#include "periph/spi.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @name Xtimer configuration
+ *
+ * The timer runs at 250 KHz to increase accuracy.
+ * @{
+ */
+#define XTIMER_HZ (250000UL)
+#define XTIMER_WIDTH (16)
+/** @} */
+
+/**
+ * @name Push button pin definitions
+ * @{
+ */
+#define PB0_PIN GPIO_PIN(PD, 14)
+#define PB1_PIN GPIO_PIN(PD, 15)
+/** @} */
+
+/**
+ * @name LED pin definitions
+ * @{
+ */
+#define LED0_PIN GPIO_PIN(PD, 12)
+#define LED1_PIN GPIO_PIN(PD, 11)
+/** @} */
+
+/**
+ * @name Macros for controlling the on-board LEDs
+ * @{
+ */
+#define LED0_ON gpio_set(LED0_PIN)
+#define LED0_OFF gpio_clear(LED0_PIN)
+#define LED0_TOGGLE gpio_toggle(LED0_PIN)
+#define LED1_ON gpio_set(LED1_PIN)
+#define LED1_OFF gpio_clear(LED1_PIN)
+#define LED1_TOGGLE gpio_toggle(LED1_PIN)
+/** @} */
+
+/**
+ * @name Environmental sensors configuration
+ *
+ * Pin for enabling environmental sensors (BMP280, Si1133, Si7021, Si7210A).
+ * @{
+ */
+#define ENV_SENSE_PIC_ADDR (0x01)
+#define ENV_SENSE_PIC_BIT (0)
+/** @} */
+
+/**
+ * @name Pressure sensor configuration
+ *
+ * Connection to the on-board pressure sensor (BMP280).
+ * @{
+ */
+#ifndef BMP280_ENABLED
+#define BMP280_ENABLED (1)
+#endif
+#define BMP280_I2C I2C_DEV(0)
+
+#define BMX280_PARAM_I2C_DEV BMP280_I2C
+/** @} */
+
+/**
+ * @name Air quality/gas sensor configuration
+ *
+ * Connection to the on-board air quality/gas sensor (CCS811).
+ * @{
+ */
+#ifndef CCS811_ENABLED
+#define CCS811_ENABLED (0)
+#endif
+#define CCS811_I2C I2C_DEV(0)
+#define CCS811_PIC_ADDR (0x03)
+#define CCS811_PIC_EN_BIT (0x00)
+#define CCS811_PIC_WAKE_BIT (0x01)
+/** @} */
+
+/**
+ * @name IMU sensor configuration
+ *
+ * Connection to the on-board IMU sensor (ICM-20648).
+ * @{
+ */
+#ifndef ICM20648_ENABLED
+#define ICM20648_ENABLED (0)
+#endif
+#define ICM20648_SPI SPI_DEV(0)
+#define ICM20648_PIC_ADDR (0x00)
+#define ICM20648_PIC_EN_BIT (0x00)
+/** @} */
+
+/**
+ * @name Power and Interrupt controller
+ *
+ * Pin for communication with the Power and Interrupt Controller.
+ * @{
+ */
+#define PIC_INT_WAKE_PIN GPIO_PIN(PD, 10)
+#define PIC_I2C I2C_DEV(0)
+#define PIC_I2C_ADDR (0x48)
+/** @} */
+
+/**
+ * @name RGB leds configuration
+ *
+ * There are four RGB leds on the board.
+ * @{
+ */
+#ifndef RGB_LED1_ENABLED
+#define RGB_LED1_ENABLED (1)
+#endif
+#ifndef RGB_LED2_ENABLED
+#define RGB_LED2_ENABLED (1)
+#endif
+#ifndef RGB_LED3_ENABLED
+#define RGB_LED3_ENABLED (1)
+#endif
+#ifndef RGB_LED4_ENABLED
+#define RGB_LED4_ENABLED (1)
+#endif
+#define RGB_LED_ADDR (0x04)
+#define RGB_LED_EN_BIT (0x00)
+#define RGB_LED1_EN_BIT (0x07)
+#define RGB_LED2_EN_BIT (0x06)
+#define RGB_LED3_EN_BIT (0x05)
+#define RGB_LED4_EN_BIT (0x04)
+/** @} */
+
+/**
+ * @name UV/Ambient sensor configuration
+ *
+ * Connection to the on-board UV/ambient light sensor (Si1133).
+ * @{
+ */
+#ifndef SI1133_ENABLED
+#define SI1133_ENABLED (0)
+#endif
+#define SI1133_I2C I2C_DEV(0)
+/** @} */
+
+/**
+ * @name Temperature sensor configuration
+ *
+ * Connection to the on-board temperature/humidity sensor (Si7021).
+ * @{
+ */
+#ifndef SI7021_ENABLED
+#define SI7021_ENABLED (1)
+#endif
+#define SI7021_I2C I2C_DEV(0)
+
+#define SI70XX_PARAM_I2C_DEV SI7021_I2C
+/** @} */
+
+/**
+ * @name Hall-effect sensor configuration
+ *
+ * Connection to the on-board hall-effect sensor (Si7210A). Available on Rev. A02
+ * boards only.
+ * @{
+ */
+#ifndef SI7210A_ENABLED
+#define SI7210A_ENABLED (0)
+#endif
+#define SI7210A_I2C I2C_DEV(0)
+/** @} */
+
+/**
+ * @brief Initialize the board (GPIO, sensors, clocks).
+ */
+void board_init(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* BOARD_H */
+/** @} */
diff --git a/boards/sltb001a/include/gpio_params.h b/boards/sltb001a/include/gpio_params.h
new file mode 100644
index 0000000000000000000000000000000000000000..fde408fbe3ccaac85ceea17c61fb4cfae09b73b5
--- /dev/null
+++ b/boards/sltb001a/include/gpio_params.h
@@ -0,0 +1,63 @@
+/*
+ * Copyright (C) 2016-2017 Bas Stottelaar <basstottelaar@gmail.com>
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @ingroup boards_sltb001a
+ * @{
+ *
+ * @file
+ * @brief Board specific configuration of direct mapped GPIOs
+ *
+ * @author Bas Stottelaar <basstottelaar@gmail.com>
+ */
+
+#ifndef GPIO_PARAMS_H
+#define GPIO_PARAMS_H
+
+#include "board.h"
+#include "saul/periph.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief GPIO pin configuration
+ */
+static const saul_gpio_params_t saul_gpio_params[] =
+{
+ {
+ .name = "LED 0",
+ .pin = LED0_PIN,
+ .mode = GPIO_OUT
+ },
+ {
+ .name = "LED 1",
+ .pin = LED1_PIN,
+ .mode = GPIO_OUT
+ },
+ {
+ .name = "Button 1",
+ .pin = PB0_PIN,
+ .mode = GPIO_IN_PU,
+ .flags = SAUL_GPIO_INVERTED
+ },
+ {
+ .name = "Button 2",
+ .pin = PB1_PIN,
+ .mode = GPIO_IN_PU,
+ .flags = SAUL_GPIO_INVERTED
+ }
+};
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* GPIO_PARAMS_H */
+/** @} */
diff --git a/boards/sltb001a/include/periph_conf.h b/boards/sltb001a/include/periph_conf.h
new file mode 100644
index 0000000000000000000000000000000000000000..b54d77f406a34f97554221ec9a3c1dceb4e957fc
--- /dev/null
+++ b/boards/sltb001a/include/periph_conf.h
@@ -0,0 +1,215 @@
+/*
+ * Copyright (C) 2015-2017 Freie Universität Berlin
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @ingroup boards_sltb001a
+ * @{
+ *
+ * @file
+ * @brief Configuration of CPU peripherals for the SLTB001A starter kit
+ *
+ * @author Hauke Petersen <hauke.petersen@fu-berlin.de>
+ * @author Bas Stottelaar <basstottelaar@gmail.com>
+ */
+
+#ifndef PERIPH_CONF_H
+#define PERIPH_CONF_H
+
+#include "cpu.h"
+
+#include "periph_cpu.h"
+
+#include "em_cmu.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief Internal macro to calculate *_NUMOF based on config.
+ */
+#define PERIPH_NUMOF(config) (sizeof(config) / sizeof(config[0]))
+
+/**
+ * @name Clock configuration
+ * @{
+ */
+#ifndef CLOCK_HF
+#define CLOCK_HF cmuSelect_HFXO
+#endif
+#ifndef CLOCK_CORE_DIV
+#define CLOCK_CORE_DIV cmuClkDiv_1
+#endif
+#ifndef CLOCK_LFA
+#define CLOCK_LFA cmuSelect_LFXO
+#endif
+#ifndef CLOCK_LFB
+#define CLOCK_LFB cmuSelect_LFXO
+#endif
+#ifndef CLOCK_LFE
+#define CLOCK_LFE cmuSelect_LFXO
+#endif
+/** @} */
+
+/**
+ * @name ADC configuration
+ * @{
+ */
+static const adc_conf_t adc_config[] = {
+ {
+ .dev = ADC0,
+ .cmu = cmuClock_ADC0,
+ }
+};
+
+static const adc_chan_conf_t adc_channel_config[] = {
+ {
+ .dev = 0,
+ .input = adcPosSelTEMP,
+ .reference = adcRef1V25,
+ .acq_time = adcAcqTime8
+ },
+ {
+ .dev = 0,
+ .input = adcPosSelAVDD,
+ .reference = adcRef5V,
+ .acq_time = adcAcqTime8
+ }
+};
+
+#define ADC_DEV_NUMOF PERIPH_NUMOF(adc_config)
+#define ADC_NUMOF PERIPH_NUMOF(adc_channel_config)
+/** @} */
+
+/**
+ * @name I2C configuration
+ * @{
+ */
+static const i2c_conf_t i2c_config[] = {
+ {
+ .dev = I2C0,
+ .sda_pin = GPIO_PIN(PC, 10),
+ .scl_pin = GPIO_PIN(PC, 11),
+ .loc = I2C_ROUTELOC0_SDALOC_LOC15 |
+ I2C_ROUTELOC0_SCLLOC_LOC15,
+ .cmu = cmuClock_I2C0,
+ .irq = I2C0_IRQn
+
+ }
+};
+
+#define I2C_NUMOF PERIPH_NUMOF(i2c_config)
+#define I2C_0_ISR isr_i2c0
+/** @} */
+
+/**
+ * @brief RTC configuration
+ */
+#define RTC_NUMOF (1U)
+
+/**
+ * @name RTT configuration
+ * @{
+ */
+#define RTT_NUMOF (1U)
+
+#define RTT_MAX_VALUE (0xFFFFFFFF)
+#define RTT_FREQUENCY (1U)
+/** @} */
+
+/**
+ * @name SPI configuration
+ * @{
+ */
+static const spi_dev_t spi_config[] = {
+ {
+ .dev = USART1,
+ .mosi_pin = GPIO_PIN(PC, 6),
+ .miso_pin = GPIO_PIN(PC, 7),
+ .clk_pin = GPIO_PIN(PC, 8),
+ .loc = USART_ROUTELOC0_RXLOC_LOC11 |
+ USART_ROUTELOC0_TXLOC_LOC11 |
+ USART_ROUTELOC0_CLKLOC_LOC11,
+ .cmu = cmuClock_USART1,
+ .irq = USART1_RX_IRQn
+ }
+};
+
+#define SPI_NUMOF PERIPH_NUMOF(spi_config)
+/** @} */
+
+/**
+ * @name Timer configuration
+ *
+ * The implementation uses two timers in cascade mode.
+ * @{
+ */
+static const timer_conf_t timer_config[] = {
+ {
+ {
+ .dev = TIMER0,
+ .cmu = cmuClock_TIMER0
+ },
+ {
+ .dev = TIMER1,
+ .cmu = cmuClock_TIMER1
+ },
+ .irq = TIMER1_IRQn
+ }
+};
+
+#define TIMER_NUMOF PERIPH_NUMOF(timer_config)
+#define TIMER_0_ISR isr_timer1
+/** @} */
+
+/**
+ * @name UART configuration
+ * @{
+ */
+static const uart_conf_t uart_config[] = {
+ {
+ .dev = USART0,
+ .rx_pin = GPIO_PIN(PA, 1),
+ .tx_pin = GPIO_PIN(PA, 0),
+ .loc = USART_ROUTELOC0_RXLOC_LOC0 |
+ USART_ROUTELOC0_TXLOC_LOC0,
+ .cmu = cmuClock_USART0,
+ .irq = USART0_RX_IRQn
+ },
+ {
+ .dev = USART1,
+ .rx_pin = GPIO_PIN(PC, 6),
+ .tx_pin = GPIO_PIN(PC, 7),
+ .loc = USART_ROUTELOC0_RXLOC_LOC11 |
+ USART_ROUTELOC0_TXLOC_LOC11,
+ .cmu = cmuClock_USART1,
+ .irq = USART1_RX_IRQn
+ },
+ {
+ .dev = LEUART0,
+ .rx_pin = GPIO_PIN(PD, 11),
+ .tx_pin = GPIO_PIN(PD, 10),
+ .loc = LEUART_ROUTELOC0_RXLOC_LOC18 |
+ LEUART_ROUTELOC0_TXLOC_LOC18,
+ .cmu = cmuClock_LEUART0,
+ .irq = LEUART0_IRQn
+ }
+};
+
+#define UART_NUMOF PERIPH_NUMOF(uart_config)
+#define UART_0_ISR_RX isr_usart0_rx
+#define UART_1_ISR_RX isr_usart1_rx
+#define UART_2_ISR_RX isr_leuart0
+/** @} */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* PERIPH_CONF_H */
+/** @} */