diff --git a/drivers/bsl.c b/drivers/bsl.c
index 2d30f18..a947fbe 100644
--- a/drivers/bsl.c
+++ b/drivers/bsl.c
@@ -208,6 +208,8 @@ static void bsl_destroy(device_t dev_base)
 
 static int bsl_ctl(device_t dev_base, device_ctl_t type)
 {
+	(void)dev_base;
+
 	switch (type) {
 	case DEVICE_CTL_HALT:
 		/* Ignore halt requests */
@@ -226,17 +228,25 @@ static int bsl_ctl(device_t dev_base, device_ctl_t type)
 
 static device_status_t bsl_poll(device_t dev_base)
 {
+	(void)dev_base;
+
 	return DEVICE_STATUS_HALTED;
 }
 
 static int bsl_getregs(device_t dev_base, address_t *regs)
 {
+	(void)dev_base;
+	(void)regs;
+
 	printc_err("bsl: register fetch is not implemented\n");
 	return -1;
 }
 
 static int bsl_setregs(device_t dev_base, const address_t *regs)
 {
+	(void)dev_base;
+	(void)regs;
+
 	printc_err("bsl: register store is not implemented\n");
 	return -1;
 }
@@ -308,6 +318,8 @@ static int bsl_erase(device_t dev_base, device_erase_type_t type,
 {
 	struct bsl_device *dev = (struct bsl_device *)dev_base;
 
+	(void)addr;
+
 	if (type != DEVICE_ERASE_MAIN) {
 		printc_err("bsl: only main erase is supported\n");
 		return -1;
diff --git a/drivers/flash_bsl.c b/drivers/flash_bsl.c
index b6b7e82..e0cbfb1 100644
--- a/drivers/flash_bsl.c
+++ b/drivers/flash_bsl.c
@@ -437,6 +437,8 @@ static int flash_bsl_unlock(struct flash_bsl_device *dev)
 
 static int flash_bsl_ctl(device_t dev_base, device_ctl_t type)
 {
+	(void)dev_base;
+
 	switch (type) {
 	case DEVICE_CTL_HALT:
 		/* Ignore halt requests */
@@ -455,17 +457,25 @@ static int flash_bsl_ctl(device_t dev_base, device_ctl_t type)
 
 static device_status_t flash_bsl_poll(device_t dev_base)
 {
+	(void)dev_base;
+
 	return DEVICE_STATUS_HALTED;
 }
 
 static int flash_bsl_getregs(device_t dev_base, address_t *regs)
 {
+	(void)dev_base;
+	(void)regs;
+
 	printc_err("flash_bsl: register fetch is not implemented\n");
 	return -1;
 }
 
 static int flash_bsl_setregs(device_t dev_base, const address_t *regs)
 {
+	(void)dev_base;
+	(void)regs;
+
 	printc_err("flash_bsl: register store is not implemented\n");
 	return -1;
 }
diff --git a/drivers/gdbc.c b/drivers/gdbc.c
index 411a803..c7788b0 100644
--- a/drivers/gdbc.c
+++ b/drivers/gdbc.c
@@ -299,6 +299,9 @@ static int gdbc_erase(device_t dev_base, device_erase_type_t type,
 	char buf[GDB_BUF_SIZE];
 	int len;
 
+	(void)type;
+	(void)addr;
+
 	gdb_packet_start(&dev->gdb);
 	gdb_printf(&dev->gdb, "qRcmd,");
 	while (*cmd)
diff --git a/drivers/sim.c b/drivers/sim.c
index 18afe3b..f07f738 100644
--- a/drivers/sim.c
+++ b/drivers/sim.c
@@ -726,6 +726,8 @@ static device_t sim_open(const struct device_args *args)
 {
 	struct sim_device *dev = malloc(sizeof(*dev));
 
+	(void)args;
+
 	if (!dev) {
 		pr_error("can't allocate memory for simulation");
 		return NULL;
diff --git a/drivers/tilib.c b/drivers/tilib.c
index 0b57761..3e12c10 100644
--- a/drivers/tilib.c
+++ b/drivers/tilib.c
@@ -104,6 +104,9 @@ static void event_notify(unsigned int msg_id, unsigned int w_param,
 {
 	struct tilib_device *dev = (struct tilib_device *)client_handle;
 
+	(void)w_param;
+	(void)l_param;
+
 	threads_lock_acquire(&dev->mb_lock);
 	dev->mailbox |= msg_id;
 	threads_lock_release(&dev->mb_lock);
@@ -435,6 +438,8 @@ static void fw_progress(unsigned int msg_id, unsigned long w_param,
 {
 	struct tilib_device *dev = (struct tilib_device *)client_handle;
 
+	(void)l_param;
+
 	switch (msg_id) {
 	case BL_DATA_BLOCK_PROGRAMMED:
 		if (w_param > 100)
diff --git a/formats/ihex.c b/formats/ihex.c
index dc2adec..3182dd4 100644
--- a/formats/ihex.c
+++ b/formats/ihex.c
@@ -28,7 +28,7 @@ int ihex_check(FILE *in)
 	return fgetc(in) == ':';
 }
 
-static int feed_line(FILE *in, uint8_t *data, int nbytes, binfile_imgcb_t cb,
+static int feed_line(uint8_t *data, int nbytes, binfile_imgcb_t cb,
 		     void *user_data, address_t *segment_offset)
 {
 	uint8_t cksum = 0;
@@ -134,7 +134,7 @@ int ihex_extract(FILE *in, binfile_imgcb_t cb, void *user_data)
 		}
 
 		/* Handle the line */
-		if (feed_line(in, data, nbytes, cb, user_data,
+		if (feed_line(data, nbytes, cb, user_data,
 			      &segment_offset) < 0) {
 			printc_err("ihex: error on line %d\n", lno);
 			return -1;
diff --git a/simio/simio.c b/simio/simio.c
index 5ba12e7..ce829e2 100644
--- a/simio/simio.c
+++ b/simio/simio.c
@@ -159,6 +159,8 @@ static int cmd_devices(char **arg_text)
 {
 	struct list_node *n;
 
+	(void)arg_text;
+
 	for (n = device_list.next; n != &device_list; n = n->next) {
 		struct simio_device *dev = (struct simio_device *)n;
 		int irq = -1;
@@ -181,6 +183,8 @@ static int cmd_classes(char **arg_text)
 	struct vector v;
 	int i;
 
+	(void)arg_text;
+
 	vector_init(&v, sizeof(const char *));
 	for (i = 0; i < ARRAY_LEN(class_db); i++) {
 		if (vector_push(&v, &class_db[i]->name, 1) < 0) {
diff --git a/simio/simio_gpio.c b/simio/simio_gpio.c
index 510c7a2..b2fcfe2 100644
--- a/simio/simio_gpio.c
+++ b/simio/simio_gpio.c
@@ -53,6 +53,8 @@ static struct simio_device *gpio_create(char **arg_text)
 {
 	struct gpio *g;
 
+	(void)arg_text;
+
 	g = malloc(sizeof(*g));
 	if (!g) {
 		pr_error("gpio: can't allocate memory");
diff --git a/simio/simio_hwmult.c b/simio/simio_hwmult.c
index b1e08fa..71bd785 100644
--- a/simio/simio_hwmult.c
+++ b/simio/simio_hwmult.c
@@ -49,6 +49,8 @@ struct simio_device *hwmult_create(char **arg_text)
 {
 	struct hwmult *h = malloc(sizeof(*h));
 
+	(void)arg_text;
+
 	if (!h) {
 		pr_error("hwmult: can't allocate memory");
 		return NULL;
diff --git a/simio/simio_timer.c b/simio/simio_timer.c
index bbbbaa1..962e4a2 100644
--- a/simio/simio_timer.c
+++ b/simio/simio_timer.c
@@ -417,6 +417,8 @@ static void timer_step(struct simio_device *dev,
 	int pulse_count;
 	int i;
 
+	(void)status;
+
 	/* Count input clock pulses */
 	i = (tr->tactl >> 8) & 3;
 	if (i == 2)
diff --git a/simio/simio_tracer.c b/simio/simio_tracer.c
index 6a30654..92f9969 100644
--- a/simio/simio_tracer.c
+++ b/simio/simio_tracer.c
@@ -265,6 +265,8 @@ static int tracer_read(struct simio_device *dev,
 {
 	struct tracer *tr = (struct tracer *)dev;
 
+	(void)data;
+
 	event_rec(tr, EVENT_READ_16, addr, 0);
 	return 1;
 }
@@ -283,6 +285,8 @@ static int tracer_read_b(struct simio_device *dev,
 {
 	struct tracer *tr = (struct tracer *)dev;
 
+	(void)data;
+
 	event_rec(tr, EVENT_READ_8, addr, 0);
 	return 1;
 }
diff --git a/simio/simio_wdt.c b/simio/simio_wdt.c
index 063590a..bb8d954 100644
--- a/simio/simio_wdt.c
+++ b/simio/simio_wdt.c
@@ -62,6 +62,8 @@ struct simio_device *wdt_create(char **arg_text)
 {
 	struct wdt *w = malloc(sizeof(*w));
 
+	(void)arg_text;
+
 	if (!w) {
 		pr_error("wdt: can't allocate memory");
 		return NULL;
@@ -220,6 +222,8 @@ static void wdt_step(struct simio_device *dev, uint16_t status_register,
 	struct wdt *w = (struct wdt *)dev;
 	int max = 1;
 
+	(void)status_register;
+
 	/* If on hold, nothing happens */
 	if (w->wdtctl & WDTHOLD)
 		return;
diff --git a/ui/devcmd.c b/ui/devcmd.c
index cc8fe52..f1fcfc3 100644
--- a/ui/devcmd.c
+++ b/ui/devcmd.c
@@ -38,6 +38,8 @@ int cmd_regs(char **arg)
 	uint8_t code[16];
 	int len = sizeof(code);
 
+	(void)arg;
+
 	if (device_getregs(regs) < 0)
 		return -1;
 	show_regs(regs);
@@ -134,6 +136,8 @@ int cmd_mw(char **arg)
 
 int cmd_reset(char **arg)
 {
+	(void)arg;
+
 	return device_ctl(DEVICE_CTL_RESET);
 }
 
@@ -199,6 +203,8 @@ int cmd_run(char **arg)
 	device_status_t status;
 	address_t regs[DEVICE_NUM_REGS];
 
+	(void)arg;
+
 	if (device_getregs(regs) < 0) {
 		printc_err("warning: device: can't fetch registers\n");
 	} else {
@@ -354,7 +360,7 @@ static int hexout_start(struct hexout_data *hexout, const char *filename)
 	return 0;
 }
 
-static int hexout_write(FILE *out, int len, uint16_t addr, int type,
+static int hexout_write(FILE *out, int len, uint16_t addr,
 			const uint8_t *payload)
 {
 	int i;
@@ -393,13 +399,13 @@ static int hexout_flush(struct hexout_data *hexout)
 	if (segoff != hexout->segoff) {
 		uint8_t offset_data[] = {segoff >> 8, segoff & 0xff};
 
-		if (hexout_write(hexout->file, 2, 0, 4, offset_data) < 0)
+		if (hexout_write(hexout->file, 2, 0, offset_data) < 0)
 			return -1;
 		hexout->segoff = segoff;
 	}
 
 	if (hexout_write(hexout->file, hexout->len, addr_low,
-			 0, hexout->buf) < 0)
+			 hexout->buf) < 0)
 		return -1;
 	hexout->len = 0;
 	return 0;
@@ -628,6 +634,8 @@ int cmd_break(char **arg)
 {
 	int i;
 
+	(void)arg;
+
 	printc("%d breakpoints available:\n", device_default->max_breakpoints);
 	for (i = 0; i < device_default->max_breakpoints; i++) {
 		const struct device_breakpoint *bp =
diff --git a/ui/gdb.c b/ui/gdb.c
index ba842e5..b5fe2fe 100644
--- a/ui/gdb.c
+++ b/ui/gdb.c
@@ -210,7 +210,7 @@ static int write_memory(struct gdb_data *data, char *text)
 	return gdb_send(data, "OK");
 }
 
-static int run_set_pc(struct gdb_data *data, char *buf)
+static int run_set_pc(char *buf)
 {
 	address_t regs[DEVICE_NUM_REGS];
 
@@ -257,7 +257,7 @@ static int single_step(struct gdb_data *data, char *buf)
 {
 	printc("Single stepping\n");
 
-	if (run_set_pc(data, buf) < 0 ||
+	if (run_set_pc(buf) < 0 ||
 	    device_ctl(DEVICE_CTL_STEP) < 0)
 		gdb_send(data, "E00");
 
@@ -268,7 +268,7 @@ static int run(struct gdb_data *data, char *buf)
 {
 	printc("Running\n");
 
-	if (run_set_pc(data, buf) < 0 ||
+	if (run_set_pc(buf) < 0 ||
 	    device_ctl(DEVICE_CTL_RUN) < 0)
 		return gdb_send(data, "E00");
 
@@ -372,7 +372,7 @@ static int gdb_send_supported(struct gdb_data *data)
 	return gdb_flush_ack(data);
 }
 
-static int process_gdb_command(struct gdb_data *data, char *buf, int len)
+static int process_gdb_command(struct gdb_data *data, char *buf)
 {
 #ifdef DEBUG_GDB
 	printc("process_gdb_command: %s\n", buf);
@@ -434,7 +434,7 @@ static void gdb_reader_loop(struct gdb_data *data)
 		len = gdb_read_packet(data, buf);
 		if (len < 0)
 			return;
-		if (len && process_gdb_command(data, buf, len) < 0)
+		if (len && process_gdb_command(data, buf) < 0)
 			return;
 	}
 }
diff --git a/ui/rtools.c b/ui/rtools.c
index eb96862..0826988 100644
--- a/ui/rtools.c
+++ b/ui/rtools.c
@@ -55,6 +55,8 @@ static int isearch_opcode(const char *term, char **arg,
 	const char *opname = get_arg(arg);
 	int opc;
 
+	(void)term;
+
 	if (q->flags & ISEARCH_OPCODE) {
 		printc_err("isearch: opcode already specified\n");
 		return -1;
@@ -79,6 +81,8 @@ static int isearch_opcode(const char *term, char **arg,
 static int isearch_bw(const char *term, char **arg,
 		      struct isearch_query *q)
 {
+	(void)arg;
+
 	if (q->flags & ISEARCH_DSIZE) {
 		printc_err("isearch: operand size already specified\n");
 		return -1;
@@ -105,6 +109,8 @@ static int isearch_bw(const char *term, char **arg,
 static int isearch_type(const char *term, char **arg,
 			struct isearch_query *q)
 {
+	(void)arg;
+
 	if (q->flags & ISEARCH_TYPE) {
 		printc_err("isearch: instruction type already "
 			"specified\n");
diff --git a/ui/stdcmd.c b/ui/stdcmd.c
index 57200e7..ea5f4cf 100644
--- a/ui/stdcmd.c
+++ b/ui/stdcmd.c
@@ -47,6 +47,8 @@ static const char *type_text(opdb_type_t type)
 static int push_option_name(void *user_data, const struct opdb_key *key,
 			    const union opdb_value *value)
 {
+	(void)value;
+
 	return vector_push((struct vector *)user_data, &key->name, 1);
 }
 
@@ -138,6 +140,8 @@ static int parse_option(opdb_type_t type, union opdb_value *value,
 static int display_option(void *user_data, const struct opdb_key *key,
 			  const union opdb_value *value)
 {
+	(void)user_data;
+
 	printc("%32s = ", key->name);
 
 	switch (key->type) {
@@ -203,6 +207,8 @@ int cmd_read(char **arg)
 
 int cmd_exit(char **arg)
 {
+	(void)arg;
+
 	reader_exit();
 	return 0;
 }
diff --git a/ui/sym.c b/ui/sym.c
index d5522d8..2ba54d4 100644
--- a/ui/sym.c
+++ b/ui/sym.c
@@ -130,6 +130,8 @@ static int cmd_sym_savemap(char **arg)
 
 static int print_sym(void *user_data, const char *name, address_t value)
 {
+	(void)user_data;
+
 	printc("0x%04x: %s\n", value, name);
 	return 0;
 }
@@ -221,6 +223,8 @@ static int find_renames(void *user_data, const char *name, address_t value)
 	struct rename_data *rename = (struct rename_data *)user_data;
 	regmatch_t pmatch;
 
+	(void)value;
+
 	if (!regexec(&rename->preg, name, 1, &pmatch, 0) &&
 	    pmatch.rm_so >= 0 && pmatch.rm_eo > pmatch.rm_so) {
 		struct rename_record r;
diff --git a/util/dis.c b/util/dis.c
index 932d54b..edf5541 100644
--- a/util/dis.c
+++ b/util/dis.c
@@ -32,8 +32,8 @@
 /* Disassembler
  */
 
-static int decode_00xx(const uint8_t *code, address_t offset,
-		       address_t len, struct msp430_instruction *insn)
+static int decode_00xx(const uint8_t *code, address_t len,
+		       struct msp430_instruction *insn)
 {
 	uint16_t op = code[0] | (code[1] << 8);
 	int subtype = (op >> 4) & 0xf;
@@ -155,8 +155,8 @@ static int decode_00xx(const uint8_t *code, address_t offset,
 	return -1;
 }
 
-static int decode_13xx(const uint8_t *code, address_t offset,
-		       address_t len, struct msp430_instruction *insn)
+static int decode_13xx(const uint8_t *code, address_t len,
+		       struct msp430_instruction *insn)
 {
 	uint16_t op = code[0] | (code[1] << 8);
 	int subtype = (op >> 4) & 0xf;
@@ -218,8 +218,8 @@ static int decode_13xx(const uint8_t *code, address_t offset,
 	return 4;
 }
 
-static int decode_14xx(const uint8_t *code, address_t offset,
-		       address_t size, struct msp430_instruction *insn)
+static int decode_14xx(const uint8_t *code,
+		       struct msp430_instruction *insn)
 {
 	uint16_t op = (code[1] << 8) | code[0];
 
@@ -384,7 +384,7 @@ static int decode_double(const uint8_t *code, address_t offset,
  * All jump instructions are one word in length, so this function
  * always returns 2 (to indicate the consumption of 2 bytes).
  */
-static int decode_jump(const uint8_t *code, address_t offset, address_t len,
+static int decode_jump(const uint8_t *code, address_t offset,
 		       struct msp430_instruction *insn)
 {
 	uint16_t op = (code[1] << 8) | code[0];
@@ -790,15 +790,15 @@ int dis_decode(const uint8_t *code, address_t offset, address_t len,
 			insn->dsize |= 2;
 	} else {
 		if ((op & 0xf000) == 0x0000)
-			ret = decode_00xx(code, offset, len, insn);
+			ret = decode_00xx(code, len, insn);
 		else if ((op & 0xfc00) == 0x1400)
-			ret = decode_14xx(code, offset, len, insn);
+			ret = decode_14xx(code, insn);
 		else if ((op & 0xff00) == 0x1300)
-			ret = decode_13xx(code, offset, len, insn);
+			ret = decode_13xx(code, len, insn);
 		else if ((op & 0xf000) == 0x1000)
 			ret = decode_single(code, offset, len, insn);
 		else if ((op & 0xf000) >= 0x2000 && (op & 0xf000) < 0x4000)
-			ret = decode_jump(code, offset, len, insn);
+			ret = decode_jump(code, offset, insn);
 		else if ((op & 0xf000) >= 0x4000)
 			ret = decode_double(code, offset, len, insn);
 		else
diff --git a/util/util.c b/util/util.c
index 68426fb..8acab0b 100644
--- a/util/util.c
+++ b/util/util.c
@@ -92,6 +92,8 @@ static volatile int ctrlc_flag;
 
 static void sigint_handler(int signum)
 {
+	(void)signum;
+
 	ctrlc_flag = 1;
 }