diff --git a/os/hal/ports/KINETIS/K20x/platform.mk b/os/hal/ports/KINETIS/K20x/platform.mk
index c556a0853..71735aaf5 100644
--- a/os/hal/ports/KINETIS/K20x/platform.mk
+++ b/os/hal/ports/KINETIS/K20x/platform.mk
@@ -2,6 +2,7 @@
 PLATFORMSRC = ${CHIBIOS}/os/hal/ports/common/ARMCMx/nvic.c \
               ${CHIBIOS}/os/hal/ports/KINETIS/K20x/hal_lld.c \
               ${CHIBIOS}/os/hal/ports/KINETIS/K20x/pal_lld.c \
+              ${CHIBIOS}/os/hal/ports/KINETIS/K20x/serial_lld.c \
               ${CHIBIOS}/os/hal/ports/KINETIS/K20x/st_lld.c
 
 # Required include directories
diff --git a/os/hal/ports/KINETIS/K20x/serial_lld.c b/os/hal/ports/KINETIS/K20x/serial_lld.c
new file mode 100644
index 000000000..921613315
--- /dev/null
+++ b/os/hal/ports/KINETIS/K20x/serial_lld.c
@@ -0,0 +1,353 @@
+/*
+    ChibiOS/RT - Copyright (C) 2006-2014 Giovanni Di Sirio
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+        http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+*/
+
+/**
+ * @file    K20x/serial_lld.c
+ * @brief   Kinetis K20x Serial Driver subsystem low level driver source.
+ *
+ * @addtogroup SERIAL
+ * @{
+ */
+
+#include "osal.h"
+#include "hal.h"
+
+#if HAL_USE_SERIAL || defined(__DOXYGEN__)
+
+#include "mk20d5.h"
+
+/*===========================================================================*/
+/* Driver local definitions.                                                 */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver exported variables.                                                */
+/*===========================================================================*/
+
+/**
+ * @brief   SD1 driver identifier.
+ */
+#if KINETIS_SERIAL_USE_UART0 || defined(__DOXYGEN__)
+SerialDriver SD1;
+#endif
+
+#if KINETIS_SERIAL_USE_UART1 || defined(__DOXYGEN__)
+SerialDriver SD2;
+#endif
+
+#if KINETIS_SERIAL_USE_UART2 || defined(__DOXYGEN__)
+SerialDriver SD3;
+#endif
+
+/*===========================================================================*/
+/* Driver local variables and types.                                         */
+/*===========================================================================*/
+
+/**
+ * @brief   Driver default configuration.
+ */
+static const SerialConfig default_config = {
+  38400
+};
+
+/*===========================================================================*/
+/* Driver local functions.                                                   */
+/*===========================================================================*/
+
+/**
+ * @brief   Common IRQ handler.
+ * @note    Tries hard to clear all the pending interrupt sources, we don't
+ *          want to go through the whole ISR and have another interrupt soon
+ *          after.
+ *
+ * @param[in] u         pointer to an UART I/O block
+ * @param[in] sdp       communication channel associated to the UART
+ */
+static void serve_interrupt(SerialDriver *sdp) {
+  UART_TypeDef *u = sdp->uart;
+  uint8_t s1 = u->S1;
+
+  if (s1 & UARTx_S1_RDRF) {
+    osalSysLockFromISR();
+    if (chIQIsEmptyI(&sdp->iqueue))
+      chnAddFlagsI(sdp, CHN_INPUT_AVAILABLE);
+    if (chIQPutI(&sdp->iqueue, u->D) < Q_OK)
+      chnAddFlagsI(sdp, SD_OVERRUN_ERROR);
+    osalSysUnlockFromISR();
+  }
+
+  if (s1 & UARTx_S1_TDRE) {
+    msg_t b;
+
+    osalSysLockFromISR();
+    b = chOQGetI(&sdp->oqueue);
+    osalSysUnlockFromISR();
+
+    if (b < Q_OK) {
+      osalSysLockFromISR();
+      chnAddFlagsI(sdp, CHN_OUTPUT_EMPTY);
+      osalSysUnlockFromISR();
+      u->C2 &= ~UARTx_C2_TIE;
+    } else {
+       u->D = b;
+    }
+  }
+
+  while (u->S1)
+    (void)u->D;
+}
+
+/**
+ * @brief   Attempts a TX preload
+ */
+static void preload(SerialDriver *sdp) {
+  UART_TypeDef *u = sdp->uart;
+
+  if (u->S1 & UARTx_S1_TDRE) {
+    msg_t b = chOQGetI(&sdp->oqueue);
+    if (b < Q_OK) {
+      chnAddFlagsI(sdp, CHN_OUTPUT_EMPTY);
+      return;
+    }
+    u->D = b;
+    u->C2 |= UARTx_C2_TIE;
+  }
+}
+
+/**
+ * @brief   Driver output notification.
+ */
+#if KINETIS_SERIAL_USE_UART0 || defined(__DOXYGEN__)
+static void notify1(io_queue_t *qp)
+{
+  (void)qp;
+  preload(&SD1);
+}
+#endif
+
+#if KINETIS_SERIAL_USE_UART1 || defined(__DOXYGEN__)
+static void notify2(io_queue_t *qp)
+{
+  (void)qp;
+  preload(&SD2);
+}
+#endif
+
+#if KINETIS_SERIAL_USE_UART2 || defined(__DOXYGEN__)
+static void notify3(io_queue_t *qp)
+{
+  (void)qp;
+  preload(&SD3);
+}
+#endif
+
+/**
+ * @brief   Common UART configuration.
+ *
+ */
+static void configure_uart(UART_TypeDef *uart, const SerialConfig *config)
+{
+  uint16_t sbr, brfa;
+  uint32_t clock;
+
+  /* Disable UART while configuring */
+  uart->C2 &= ~(UARTx_C2_RE | UARTx_C2_TE);
+  uart->C1 = 0;
+  //while (uart->S1 & UARTx_S1_RDRF) {
+  //  (void)uart->D;
+  //}
+
+  clock = KINETIS_SYSCLK_FREQUENCY / 4;
+
+  sbr = (uint16_t) clock / (config->sc_speed * 16);
+  brfa = (uint16_t) (2 * clock * config->sc_speed) - (sbr * 32);
+
+  //uart->BDH = UARTx_BDH_SBR(sbr >> 8) | (uart->BDH & ~UARTx_BDH_SBR_MASK);
+  uart->BDH = 0;
+  uart->BDL = sbr;
+  uart->C4 = UARTx_C4_BRFA(brfa) | (uart->C4 & ~UARTx_C4_BRFA_MASK);
+
+  uart->TWFIFO = 1;
+  uart->RWFIFO = 1;
+
+  //uart->C2 |= UARTx_C2_RE | UARTx_C2_RIE | UARTx_C2_TE;
+  uart->C2 |= UARTx_C2_RE | UARTx_C2_TE;
+  uart->C3 = 0;
+
+  while (!(uart->S1 & UARTx_S1_TDRE));
+  uart->D = '1';
+  while (!(uart->S1 & UARTx_S1_TDRE));
+  uart->D = '2';
+  while (!(uart->S1 & UARTx_S1_TDRE));
+  uart->D = '3';
+
+  //uart->C3 = UARTx_C3_ORIE | UARTx_C3_NEIE | UARTx_C3_FEIE | UARTx_C3_PEIE;
+}
+
+/*===========================================================================*/
+/* Driver interrupt handlers.                                                */
+/*===========================================================================*/
+
+/* TODO:
+ *   UART0_Error is Vector84
+ *   UART1_Error is Vector8C
+ *   UART2_Error is Vector94
+ */
+
+#if KINETIS_SERIAL_USE_UART0 || defined(__DOXYGEN__)
+CH_IRQ_HANDLER(Vector80) {
+
+  CH_IRQ_PROLOGUE();
+  serve_interrupt(&SD1);
+  CH_IRQ_EPILOGUE();
+}
+#endif
+
+#if KINETIS_SERIAL_USE_UART1 || defined(__DOXYGEN__)
+CH_IRQ_HANDLER(Vector88) {
+
+  CH_IRQ_PROLOGUE();
+  serve_interrupt(&SD2);
+  CH_IRQ_EPILOGUE();
+}
+#endif
+
+#if KINETIS_SERIAL_USE_UART2 || defined(__DOXYGEN__)
+CH_IRQ_HANDLER(Vector90) {
+
+  CH_IRQ_PROLOGUE();
+  serve_interrupt(&SD3);
+  CH_IRQ_EPILOGUE();
+}
+#endif
+
+/*===========================================================================*/
+/* Driver exported functions.                                                */
+/*===========================================================================*/
+
+/**
+ * @brief   Low level serial driver initialization.
+ *
+ * @notapi
+ */
+void sd_lld_init(void) {
+
+#if KINETIS_SERIAL_USE_UART0
+  /* Driver initialization.*/
+  sdObjectInit(&SD1, NULL, notify1);
+  SD1.uart = UART0;
+#endif
+
+#if KINETIS_SERIAL_USE_UART1
+  /* Driver initialization.*/
+  sdObjectInit(&SD2, NULL, notify2);
+  SD2.uart = UART1;
+#endif
+
+#if KINETIS_SERIAL_USE_UART2
+  /* Driver initialization.*/
+  sdObjectInit(&SD3, NULL, notify3);
+  SD3.uart = UART2;
+#endif
+}
+
+/**
+ * @brief   Low level serial driver configuration and (re)start.
+ *
+ * @param[in] sdp       pointer to a @p SerialDriver object
+ * @param[in] config    the architecture-dependent serial driver configuration.
+ *                      If this parameter is set to @p NULL then a default
+ *                      configuration is used.
+ *
+ * @notapi
+ */
+void sd_lld_start(SerialDriver *sdp, const SerialConfig *config) {
+
+  if (config == NULL)
+    config = &default_config;
+
+  if (sdp->state == SD_STOP) {
+    /* Enables the peripheral.*/
+
+#if KINETIS_SERIAL_USE_UART0
+    if (sdp == &SD1) {
+      SIM->SCGC4 |= SIM_SCGC4_UART0;
+      configure_uart(sdp->uart, config);
+      //nvicEnableVector(UART0Status_IRQn, KINETIS_SERIAL_UART0_PRIORITY);
+    }
+#endif /* KINETIS_SERIAL_USE_UART0 */
+
+#if KINETIS_SERIAL_USE_UART1
+    if (sdp == &SD2) {
+      SIM->SCGC4 |= SIM_SCGC4_UART1;
+      configure_uart(sdp->uart, config);
+      nvicEnableVector(UART1Status_IRQn, KINETIS_SERIAL_UART1_PRIORITY);
+    }
+#endif /* KINETIS_SERIAL_USE_UART1 */
+
+#if KINETIS_SERIAL_USE_UART2
+    if (sdp == &SD3) {
+      SIM->SCGC4 |= SIM_SCGC4_UART2;
+      configure_uart(sdp->uart, config);
+      nvicEnableVector(UART2Status_IRQn, KINETIS_SERIAL_UART2_PRIORITY);
+    }
+#endif /* KINETIS_SERIAL_USE_UART2 */
+
+  }
+  /* Configures the peripheral.*/
+
+}
+
+/**
+ * @brief   Low level serial driver stop.
+ * @details De-initializes the USART, stops the associated clock, resets the
+ *          interrupt vector.
+ *
+ * @param[in] sdp       pointer to a @p SerialDriver object
+ *
+ * @notapi
+ */
+void sd_lld_stop(SerialDriver *sdp) {
+
+  if (sdp->state == SD_READY) {
+    /* TODO: Resets the peripheral.*/
+
+#if KINETIS_SERIAL_USE_UART0
+    if (sdp == &SD1) {
+      nvicDisableVector(UART0Status_IRQn);
+      SIM->SCGC4 &= ~SIM_SCGC4_UART0;
+    }
+#endif
+
+#if KINETIS_SERIAL_USE_UART1
+    if (sdp == &SD2) {
+      nvicDisableVector(UART1Status_IRQn);
+      SIM->SCGC4 &= ~SIM_SCGC4_UART1;
+    }
+#endif
+
+#if KINETIS_SERIAL_USE_UART2
+    if (sdp == &SD3) {
+      nvicDisableVector(UART2Status_IRQn);
+      SIM->SCGC4 &= ~SIM_SCGC4_UART2;
+    }
+#endif
+  }
+}
+
+#endif /* HAL_USE_SERIAL */
+
+/** @} */
diff --git a/os/hal/ports/KINETIS/K20x/serial_lld.h b/os/hal/ports/KINETIS/K20x/serial_lld.h
new file mode 100644
index 000000000..25c800056
--- /dev/null
+++ b/os/hal/ports/KINETIS/K20x/serial_lld.h
@@ -0,0 +1,163 @@
+/*
+    ChibiOS/RT - Copyright (C) 2006-2014 Giovanni Di Sirio
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+        http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+*/
+
+/**
+ * @file    K20x/serial_lld.h
+ * @brief   Kinetis K20x Serial Driver subsystem low level driver header.
+ *
+ * @addtogroup SERIAL
+ * @{
+ */
+
+#ifndef _SERIAL_LLD_H_
+#define _SERIAL_LLD_H_
+
+#if HAL_USE_SERIAL || defined(__DOXYGEN__)
+
+/*===========================================================================*/
+/* Driver constants.                                                         */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver pre-compile time settings.                                         */
+/*===========================================================================*/
+
+/**
+ * @name    Configuration options
+ * @{
+ */
+/**
+ * @brief   SD1 driver enable switch.
+ * @details If set to @p TRUE the support for SD1 is included.
+ */
+#if !defined(KINETIS_SERIAL_USE_UART0) || defined(__DOXYGEN__)
+#define KINETIS_SERIAL_USE_UART0             FALSE
+#endif
+/**
+ * @brief   SD2 driver enable switch.
+ * @details If set to @p TRUE the support for SD2 is included.
+ */
+#if !defined(KINETIS_SERIAL_USE_UART1) || defined(__DOXYGEN__)
+#define KINETIS_SERIAL_USE_UART1             FALSE
+#endif
+/**
+ * @brief   SD3 driver enable switch.
+ * @details If set to @p TRUE the support for SD3 is included.
+ */
+#if !defined(KINETIS_SERIAL_USE_UART2) || defined(__DOXYGEN__)
+#define KINETIS_SERIAL_USE_UART2             FALSE
+#endif
+
+/**
+ * @brief   UART0 interrupt priority level setting.
+ */
+#if !defined(KINETIS_SERIAL_UART0_PRIORITY) || defined(__DOXYGEN__)
+#define KINETIS_SERIAL_UART0_PRIORITY        12
+#endif
+
+/**
+ * @brief   UART1 interrupt priority level setting.
+ */
+#if !defined(KINETIS_SERIAL_UART1_PRIORITY) || defined(__DOXYGEN__)
+#define KINETIS_SERIAL_UART1_PRIORITY        12
+#endif
+
+/**
+ * @brief   UART2 interrupt priority level setting.
+ */
+#if !defined(KINETIS_SERIAL_UART2_PRIORITY) || defined(__DOXYGEN__)
+#define KINETIS_SERIAL_UART2_PRIORITY        12
+#endif
+
+/** @} */
+
+/*===========================================================================*/
+/* Derived constants and error checks.                                       */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver data structures and types.                                         */
+/*===========================================================================*/
+
+/**
+ * @brief   Generic Serial Driver configuration structure.
+ * @details An instance of this structure must be passed to @p sdStart()
+ *          in order to configure and start a serial driver operations.
+ * @note    Implementations may extend this structure to contain more,
+ *          architecture dependent, fields.
+ */
+typedef struct {
+  /**
+   * @brief Bit rate.
+   */
+  uint32_t                  sc_speed;
+  /* End of the mandatory fields.*/
+} SerialConfig;
+
+/**
+ * @brief @p SerialDriver specific data.
+ */
+#define _serial_driver_data                                                 \
+  _base_asynchronous_channel_data                                           \
+  /* Driver state.*/                                                        \
+  sdstate_t                 state;                                          \
+  /* Input queue.*/                                                         \
+  input_queue_t             iqueue;                                         \
+  /* Output queue.*/                                                        \
+  output_queue_t            oqueue;                                         \
+  /* Input circular buffer.*/                                               \
+  uint8_t                   ib[SERIAL_BUFFERS_SIZE];                        \
+  /* Output circular buffer.*/                                              \
+  uint8_t                   ob[SERIAL_BUFFERS_SIZE];                        \
+  /* End of the mandatory fields.*/                                         \
+  /* Pointer to the UART registers block.*/                                 \
+  UART_TypeDef            *uart;
+
+/*===========================================================================*/
+/* Driver macros.                                                            */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* External declarations.                                                    */
+/*===========================================================================*/
+
+#if KINETIS_SERIAL_USE_UART0 && !defined(__DOXYGEN__)
+extern SerialDriver SD1;
+#endif
+
+#if KINETIS_SERIAL_USE_UART1 && !defined(__DOXYGEN__)
+extern SerialDriver SD2;
+#endif
+
+#if KINETIS_SERIAL_USE_UART2 && !defined(__DOXYGEN__)
+extern SerialDriver SD3;
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+  void sd_lld_init(void);
+  void sd_lld_start(SerialDriver *sdp, const SerialConfig *config);
+  void sd_lld_stop(SerialDriver *sdp);
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* HAL_USE_SERIAL */
+
+#endif /* _SERIAL_LLD_H_ */
+
+/** @} */