diff --git a/libopencm3 b/libopencm3
index db7a8d7..3eff201 160000
--- a/libopencm3
+++ b/libopencm3
@@ -1 +1 @@
-Subproject commit db7a8d71ca30dd9ce7947aa036897b910bdc4ad2
+Subproject commit 3eff201a4bb3759a9c967a6f5e3fd0aad46dc5af
diff --git a/src/platforms/common/cdcacm.c b/src/platforms/common/cdcacm.c
index ccf6706..8f5f779 100644
--- a/src/platforms/common/cdcacm.c
+++ b/src/platforms/common/cdcacm.c
@@ -419,7 +419,7 @@ static void dfu_detach_complete(usbd_device *dev, struct usb_setup_data *req)
 	scb_reset_core();
 }
 
-static int cdcacm_control_request(usbd_device *dev,
+static enum usbd_request_return_codes  cdcacm_control_request(usbd_device *dev,
 		struct usb_setup_data *req, uint8_t **buf, uint16_t *len,
 		void (**complete)(usbd_device *dev, struct usb_setup_data *req))
 {
@@ -433,23 +433,23 @@ static int cdcacm_control_request(usbd_device *dev,
 		cdcacm_set_modem_state(dev, req->wIndex, true, true);
 		/* Ignore if not for GDB interface */
 		if(req->wIndex != 0)
-			return 1;
+			return USBD_REQ_HANDLED;
 
 		cdcacm_gdb_dtr = req->wValue & 1;
 
-		return 1;
+		return USBD_REQ_HANDLED;
 	case USB_CDC_REQ_SET_LINE_CODING:
 		if(*len < sizeof(struct usb_cdc_line_coding))
-			return 0;
+			return USBD_REQ_NOTSUPP;
 
 		switch(req->wIndex) {
 		case 2:
 			usbuart_set_line_coding((struct usb_cdc_line_coding*)*buf);
-			return 1;
+			return USBD_REQ_HANDLED;
 		case 0:
-			return 1; /* Ignore on GDB Port */
+			return USBD_REQ_HANDLED; /* Ignore on GDB Port */
 		default:
-			return 0;
+			return USBD_REQ_NOTSUPP;
 		}
 	case DFU_GETSTATUS:
 		if(req->wIndex == DFU_IF_NO) {
@@ -461,17 +461,17 @@ static int cdcacm_control_request(usbd_device *dev,
 			(*buf)[5] = 0;	/* iString not used here */
 			*len = 6;
 
-			return 1;
+			return USBD_REQ_HANDLED;
 		}
-		return 0;
+		return USBD_REQ_NOTSUPP;
 	case DFU_DETACH:
 		if(req->wIndex == DFU_IF_NO) {
 			*complete = dfu_detach_complete;
-			return 1;
+			return USBD_REQ_HANDLED;
 		}
-		return 0;
+		return USBD_REQ_NOTSUPP;
 	}
-	return 0;
+	return USBD_REQ_NOTSUPP;
 }
 
 int cdcacm_get_config(void)
diff --git a/src/platforms/f4discovery/platform.c b/src/platforms/f4discovery/platform.c
index 89b82c1..4703317 100644
--- a/src/platforms/f4discovery/platform.c
+++ b/src/platforms/f4discovery/platform.c
@@ -62,7 +62,7 @@ void platform_init(void)
 		scb_reset_core();
 	}
 
-	rcc_clock_setup_hse_3v3(&rcc_hse_8mhz_3v3[RCC_CLOCK_3V3_48MHZ]);
+	rcc_clock_setup_pll(&rcc_hse_8mhz_3v3[RCC_CLOCK_3V3_168MHZ]);
 
 	/* Enable peripherals */
 	rcc_periph_clock_enable(RCC_OTGFS);
diff --git a/src/platforms/hydrabus/platform.c b/src/platforms/hydrabus/platform.c
index bf3db04..e0893e8 100644
--- a/src/platforms/hydrabus/platform.c
+++ b/src/platforms/hydrabus/platform.c
@@ -46,7 +46,7 @@ void platform_init(void)
 		scb_reset_core();
 	}
 
-	rcc_clock_setup_hse_3v3(&rcc_hse_8mhz_3v3[RCC_CLOCK_3V3_48MHZ]);
+	rcc_clock_setup_pll(&rcc_hse_8mhz_3v3[RCC_CLOCK_3V3_168MHZ]);
 
 	/* Enable peripherals */
 	rcc_peripheral_enable_clock(&RCC_AHB2ENR, RCC_AHB2ENR_OTGFSEN);
diff --git a/src/platforms/launchpad-icdi/platform.h b/src/platforms/launchpad-icdi/platform.h
index a710c52..7450aa7 100644
--- a/src/platforms/launchpad-icdi/platform.h
+++ b/src/platforms/launchpad-icdi/platform.h
@@ -68,7 +68,7 @@ extern uint8_t running_status;
 	gpio_set_output_config(SWDIO_PORT, GPIO_OTYPE_PP, GPIO_DRIVE_2MA, SWDIO_PIN);		\
 }
 
-extern usbd_driver lm4f_usb_driver;
+extern const usbd_driver lm4f_usb_driver;
 #define USB_DRIVER	lm4f_usb_driver
 #define USB_IRQ		NVIC_USB0_IRQ
 #define USB_ISR		usb0_isr
diff --git a/src/platforms/stm32/blackmagic.ld b/src/platforms/stm32/blackmagic.ld
index 9755309..c1d1ce7 100644
--- a/src/platforms/stm32/blackmagic.ld
+++ b/src/platforms/stm32/blackmagic.ld
@@ -25,5 +25,5 @@ MEMORY
 }
 
 /* Include the common ld script from libopenstm32. */
-INCLUDE libopencm3_stm32f1.ld
+INCLUDE cortex-m-generic.ld
 
diff --git a/src/platforms/stm32/dfucore.c b/src/platforms/stm32/dfucore.c
index 61cfd04..adeff9a 100644
--- a/src/platforms/stm32/dfucore.c
+++ b/src/platforms/stm32/dfucore.c
@@ -198,20 +198,20 @@ usbdfu_getstatus_complete(usbd_device *dev, struct usb_setup_data *req)
 	}
 }
 
-static int usbdfu_control_request(usbd_device *dev,
+static enum usbd_request_return_codes usbdfu_control_request(usbd_device *dev,
 		struct usb_setup_data *req, uint8_t **buf, uint16_t *len,
 		void (**complete)(usbd_device *dev, struct usb_setup_data *req))
 {
 	(void)dev;
 
 	if((req->bmRequestType & 0x7F) != 0x21)
-		return 0; /* Only accept class request */
+		return USBD_REQ_NOTSUPP; /* Only accept class request */
 
 	switch(req->bRequest) {
 	case DFU_DNLOAD:
 		if((len == NULL) || (*len == 0)) {
 			usbdfu_state = STATE_DFU_MANIFEST_SYNC;
-			return 1;
+			return USBD_REQ_HANDLED;
 		} else {
 			/* Copy download data for use on GET_STATUS */
 			prog.blocknum = req->wValue;
@@ -222,22 +222,22 @@ static int usbdfu_control_request(usbd_device *dev,
 				if ((addr < app_address) || (addr >= max_address)) {
 					current_error = DFU_STATUS_ERR_TARGET;
 					usbdfu_state = STATE_DFU_ERROR;
-					return 1;
+					return USBD_REQ_HANDLED;
 				} else
 					prog.addr = addr;
 			}
 			usbdfu_state = STATE_DFU_DNLOAD_SYNC;
-			return 1;
+			return USBD_REQ_HANDLED;
 		}
 	case DFU_CLRSTATUS:
 		/* Clear error and return to dfuIDLE */
 		if(usbdfu_state == STATE_DFU_ERROR)
 			usbdfu_state = STATE_DFU_IDLE;
-		return 1;
+		return USBD_REQ_HANDLED;
 	case DFU_ABORT:
 		/* Abort returns to dfuIDLE state */
 		usbdfu_state = STATE_DFU_IDLE;
-		return 1;
+		return USBD_REQ_HANDLED;
 	case DFU_UPLOAD:
 		if ((usbdfu_state == STATE_DFU_IDLE) ||
 			(usbdfu_state == STATE_DFU_DNLOAD_IDLE) ||
@@ -250,10 +250,10 @@ static int usbdfu_control_request(usbd_device *dev,
 					 dfu_function.wTransferSize);
 				memcpy(*buf, (void*)baseaddr, *len);
 			}
-			return 1;
+			return USBD_REQ_HANDLED;
 		} else {
 			usbd_ep_stall_set(dev, 0, 1);
-			return 0;
+			return USBD_REQ_NOTSUPP;
 		}
 	case DFU_GETSTATUS: {
 		uint32_t bwPollTimeout = 0; /* 24-bit integer in DFU class spec */
@@ -268,16 +268,16 @@ static int usbdfu_control_request(usbd_device *dev,
 
 		*complete = usbdfu_getstatus_complete;
 
-		return 1;
+		return USBD_REQ_HANDLED;
 		}
 	case DFU_GETSTATE:
 		/* Return state with no state transision */
 		*buf[0] = usbdfu_state;
 		*len = 1;
-		return 1;
+		return USBD_REQ_HANDLED;
 	}
 
-	return 0;
+	return USBD_REQ_NOTSUPP;
 }
 
 void dfu_init(const usbd_driver *driver, dfu_mode_t mode)
diff --git a/src/platforms/stm32/f4discovery.ld b/src/platforms/stm32/f4discovery.ld
index b066426..812d2eb 100644
--- a/src/platforms/stm32/f4discovery.ld
+++ b/src/platforms/stm32/f4discovery.ld
@@ -25,5 +25,5 @@ MEMORY
 }
 
 /* Include the common ld script from libopenstm32. */
-INCLUDE libopencm3_stm32f4.ld
+INCLUDE cortex-m-generic.ld
 
diff --git a/src/platforms/stm32/stlink.ld b/src/platforms/stm32/stlink.ld
index 3b4af4e..64a3a84 100644
--- a/src/platforms/stm32/stlink.ld
+++ b/src/platforms/stm32/stlink.ld
@@ -25,4 +25,4 @@ MEMORY
 }
 
 /* Include the common ld script from libopenstm32. */
-INCLUDE libopencm3_stm32f1.ld
+INCLUDE cortex-m-generic.ld
diff --git a/src/platforms/stm32/stm32_can.ld b/src/platforms/stm32/stm32_can.ld
index 86861b8..0b497fc 100644
--- a/src/platforms/stm32/stm32_can.ld
+++ b/src/platforms/stm32/stm32_can.ld
@@ -25,4 +25,4 @@ MEMORY
 }
 
 /* Include the common ld script from libopenstm32. */
-INCLUDE libopencm3_stm32f1.ld
+INCLUDE cortex-m-generic.ld
diff --git a/src/platforms/stm32/traceswo.c b/src/platforms/stm32/traceswo.c
index 5007378..25ae60a 100644
--- a/src/platforms/stm32/traceswo.c
+++ b/src/platforms/stm32/traceswo.c
@@ -42,8 +42,6 @@ void traceswo_init(void)
 {
 	TRACE_TIM_CLK_EN();
 
-	timer_reset(TRACE_TIM);
-
 	/* Refer to ST doc RM0008 - STM32F10xx Reference Manual.
 	 * Section 14.3.4 - 14.3.6 (General Purpose Timer - Input Capture)
 	 *
diff --git a/src/platforms/stm32/usbuart.c b/src/platforms/stm32/usbuart.c
index a466ab5..ddcda80 100644
--- a/src/platforms/stm32/usbuart.c
+++ b/src/platforms/stm32/usbuart.c
@@ -68,7 +68,6 @@ void usbuart_init(void)
 
 	/* Setup timer for running deferred FIFO processing */
 	USBUSART_TIM_CLK_EN();
-	timer_reset(USBUSART_TIM);
 	timer_set_mode(USBUSART_TIM, TIM_CR1_CKD_CK_INT,
 			TIM_CR1_CMS_EDGE, TIM_CR1_DIR_UP);
 	timer_set_prescaler(USBUSART_TIM,
diff --git a/src/platforms/tm4c/tm4c.ld b/src/platforms/tm4c/tm4c.ld
index 8fe93a4..c2169c7 100644
--- a/src/platforms/tm4c/tm4c.ld
+++ b/src/platforms/tm4c/tm4c.ld
@@ -25,5 +25,5 @@ MEMORY
 }
 
 /* Include the common ld script from libopenstm32. */
-INCLUDE libopencm3_lm4f.ld
+INCLUDE cortex-m-generic.ld