diff --git a/src/include/queue.h b/src/include/queue.h
new file mode 100644
index 00000000..b12c672b
--- /dev/null
+++ b/src/include/queue.h
@@ -0,0 +1,85 @@
+/*
+ * Copyright 2018 Robert C. Curtis. All rights reserved.
+ *
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ROBERT C. CURTIS ``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 ROBERT C. CURTIS 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.
+ *
+ * The views and conclusions contained in the software and documentation
+ * are those of the authors and should not be interpreted as representing
+ * official policies, either expressed or implied, of Robert C. Curtis.
+ */
+
+/** @file util/queue.h
+ * Static queue primitives.
+ *
+ * This file contains a set of static queue primitives that are common among
+ * all of the low level queue implementations. The primitives are inline
+ * functions, and will be optimal if size is a constant power of 2.
+ */
+
+#ifndef I__QUEUE_H__
+	#define I__QUEUE_H__
+
+/** Increment a queue index.
+ * @param[in]	idx	Queue index
+ * @param[in]	size	Queue size
+ * @returns	The new queue index value
+ */
+static inline size_t qinc(size_t idx, size_t size)
+{
+	return ((idx + 1) % size);
+}
+
+/** Decrement a queue index.
+ * @param[in]	idx	Queue index
+ * @param[in]	size	Queue size
+ * @returns	The new queue index value
+ */
+static inline size_t qdec(size_t idx, size_t size)
+{
+	return ((idx - 1) % size);
+}
+
+/** Tests if a queue is full.
+ * @param[in]	head	Head index
+ * @param[in]	tail	Tail index
+ * @param[in]	size	Queue size
+ */
+static inline int qfull(size_t head, size_t tail, size_t size)
+{
+	size_t next_head = qinc(head, size);
+	return (next_head == tail);
+}
+
+/** Tests if a queue is empty.
+ * @param[in]	head	Head index
+ * @param[in]	tail	Tail index
+ */
+static inline int qempty(size_t head, size_t tail)
+{
+	return (head == tail);
+}
+
+#endif /* I__QUEUE_H__ */
diff --git a/src/platforms/jeff/Makefile.inc b/src/platforms/jeff/Makefile.inc
index 043b185b..a8932b14 100644
--- a/src/platforms/jeff/Makefile.inc
+++ b/src/platforms/jeff/Makefile.inc
@@ -4,6 +4,7 @@ OBJCOPY = $(CROSS_COMPILE)objcopy
 
 
 ifeq ($(ENABLE_DEBUG), 1)
+CFLAGS += -DDEBUG_ME
 CFLAGS += -DENABLE_DEBUG
 endif
 
diff --git a/src/platforms/jeff/platform.h b/src/platforms/jeff/platform.h
index dad73b68..b60c2316 100644
--- a/src/platforms/jeff/platform.h
+++ b/src/platforms/jeff/platform.h
@@ -71,6 +71,10 @@ extern uint8_t running_status;
 #define LED_PORT_UART	PORTA
 #define LED_UART	GPIO12
 
+#define UART_TX_PIN	GPIO4
+#define UART_RX_PIN	GPI05
+#define UART_PERIPH	SOC_GPIO_PERIPH_D
+
 #else
 
 /* Hardware definitions... */
@@ -98,13 +102,13 @@ extern uint8_t running_status;
 #define TRST_PIN	GPIO27
 #define PWR_BR_PORT	GPIOA
 #define PWR_BR_PIN	GPIO28
-#define SRST_PORT	GPIOA
+#define SRST_PORT	PORTA
 #define SRST_PIN	GPIO8
 #define SRST_SENSE_PORT	GPIOA
 #define SRST_SENSE_PIN	GPIO9
 #define TRGT_SENSE	GPIO2
 
-#define LED_PORT	GPIOA
+#define LED_PORT	PORTA
 #define LED_PORT_UART	PORTA
 #define LED_0		GPIO10
 #define LED_1		GPIO11
@@ -113,12 +117,9 @@ extern uint8_t running_status;
 #define LED_IDLE_RUN	LED_0	/* Yellow */
 #define LED_ERROR	LED_2	/* Red */
 
-#define UART_TX_PIN	GPIO8
-#define UART_RX_PIN	GPIO9
-#define UART_PERIPH	SOC_GPIO_PERIPH_C
-
-#define LED_PORT	PORTA
-#define LED_IDLE_RUN	GPIO11
+#define UART_TX_PIN	GPIO4
+#define UART_RX_PIN	GPIO5
+#define UART_PERIPH	SOC_GPIO_PERIPH_D
 
 #define SWO_PORT	JTAG_PORT
 #define SWO_PIN		SWD_PIN