diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c
index e08510d..d2bcd1f 100644
--- a/drivers/serial/8250.c
+++ b/drivers/serial/8250.c
@@ -102,7 +102,7 @@
 #define SERIAL_PORT_DFNS
 #endif
 
-static struct old_serial_port old_serial_port[] = {
+static const struct old_serial_port old_serial_port[] = {
 	SERIAL_PORT_DFNS /* defined in asm/serial.h */
 };
 
diff --git a/drivers/serial/8250_pci.c b/drivers/serial/8250_pci.c
index 5c3c039..8d92adf 100644
--- a/drivers/serial/8250_pci.c
+++ b/drivers/serial/8250_pci.c
@@ -468,7 +468,7 @@
 	0x9167, 0x9168, 0xA066, 0xA167, 0xA168, 0
 };
 
-static struct timedia_struct {
+static const struct timedia_struct {
 	int num;
 	unsigned short *ids;
 } timedia_data[] = {
diff --git a/drivers/serial/serial_core.c b/drivers/serial/serial_core.c
index 2331296..c17d680 100644
--- a/drivers/serial/serial_core.c
+++ b/drivers/serial/serial_core.c
@@ -1779,7 +1779,7 @@
 	unsigned int cflag;
 };
 
-static struct baud_rates baud_rates[] = {
+static const struct baud_rates baud_rates[] = {
 	{ 921600, B921600 },
 	{ 460800, B460800 },
 	{ 230400, B230400 },
diff --git a/drivers/serial/serial_cs.c b/drivers/serial/serial_cs.c
index 2c7d3ef..7ce0c7e 100644
--- a/drivers/serial/serial_cs.c
+++ b/drivers/serial/serial_cs.c
@@ -85,7 +85,7 @@
 	int multi;		/* 1 = multifunction, > 1 = # ports */
 };
 
-static struct multi_id multi_id[] = {
+static const struct multi_id multi_id[] = {
 	{ MANFID_OMEGA,   PRODID_OMEGA_QSP_100,         4 },
 	{ MANFID_QUATECH, PRODID_QUATECH_DUAL_RS232,    2 },
 	{ MANFID_QUATECH, PRODID_QUATECH_DUAL_RS232_D1, 2 },
@@ -354,8 +354,8 @@
 
 static int simple_config(dev_link_t *link)
 {
-	static kio_addr_t base[5] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8, 0x0 };
-	static int size_table[2] = { 8, 16 };
+	static const kio_addr_t base[5] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8, 0x0 };
+	static const int size_table[2] = { 8, 16 };
 	client_handle_t handle = link->handle;
 	struct serial_info *info = link->priv;
 	struct serial_cfg_mem *cfg_mem;