9 files changed, 9 insertions, 9 deletions
diff --git a/libcpu/arm/AT91SAM7S/serial.c b/libcpu/arm/AT91SAM7S/serial.c
index 77a7bd8608..ede8683b31 100644
--- a/libcpu/arm/AT91SAM7S/serial.c
+++ b/libcpu/arm/AT91SAM7S/serial.c
@@ -333,7 +333,7 @@ static rt_size_t rt_serial_write (rt_device_t dev, rt_off_t pos, const void* buf
 	return (rt_size_t)ptr - (rt_size_t)buffer;
 }
 
-static rt_err_t rt_serial_control (rt_device_t dev, rt_uint8_t cmd, void *args)
+static rt_err_t rt_serial_control (rt_device_t dev, int cmd, void *args)
 {
 	return RT_EOK;
 }
diff --git a/libcpu/arm/s3c24x0/rtc.c b/libcpu/arm/s3c24x0/rtc.c
index 0f05acd687..601f3dda95 100644
--- a/libcpu/arm/s3c24x0/rtc.c
+++ b/libcpu/arm/s3c24x0/rtc.c
@@ -127,7 +127,7 @@ static rt_size_t rtc_read(rt_device_t dev, rt_off_t pos, void* buffer, rt_size_t
 	return RT_EOK;
 }
 
-static rt_err_t rtc_control(rt_device_t dev, rt_uint8_t cmd, void *args)
+static rt_err_t rtc_control(rt_device_t dev, int cmd, void *args)
 {
 	struct tm tm, *tm_ptr;
     time_t *time;
diff --git a/libcpu/arm/s3c24x0/serial.c b/libcpu/arm/s3c24x0/serial.c
index 9229805d22..ddf303da46 100644
--- a/libcpu/arm/s3c24x0/serial.c
+++ b/libcpu/arm/s3c24x0/serial.c
@@ -222,7 +222,7 @@ static rt_size_t rt_serial_write(rt_device_t dev, rt_off_t pos, const void* buff
     return (rt_uint32_t)ptr - (rt_uint32_t)buffer;
 }
 
-static rt_err_t rt_serial_control(rt_device_t dev, rt_uint8_t cmd, void *args)
+static rt_err_t rt_serial_control(rt_device_t dev, int cmd, void *args)
 {
     RT_ASSERT(dev != RT_NULL);
 
diff --git a/libcpu/arm/sep4020/serial.c b/libcpu/arm/sep4020/serial.c
index 728f7dc1ed..3f484ee92d 100644
--- a/libcpu/arm/sep4020/serial.c
+++ b/libcpu/arm/sep4020/serial.c
@@ -208,7 +208,7 @@ static rt_size_t rt_serial_write (rt_device_t dev, rt_off_t pos, const void* buf
 	return (rt_uint32_t)ptr - (rt_uint32_t)buffer;
 }
 
-static rt_err_t rt_serial_control (rt_device_t dev, rt_uint8_t cmd, void *args)
+static rt_err_t rt_serial_control (rt_device_t dev, int cmd, void *args)
 {
 	RT_ASSERT(dev != RT_NULL);
 
diff --git a/libcpu/avr32/uc3/serial.c b/libcpu/avr32/uc3/serial.c
index 4deac6b4ab..14ef865448 100644
--- a/libcpu/avr32/uc3/serial.c
+++ b/libcpu/avr32/uc3/serial.c
@@ -172,7 +172,7 @@ static rt_size_t rt_serial_write (rt_device_t dev, rt_off_t pos, const void* buf
 	return (rt_uint32_t)ptr - (rt_uint32_t)buffer;
 }
 
-static rt_err_t rt_serial_control (rt_device_t dev, rt_uint8_t cmd, void *args)
+static rt_err_t rt_serial_control (rt_device_t dev, int cmd, void *args)
 {
 	struct avr32_serial_device* uart;
 
diff --git a/libcpu/blackfin/bf53x/serial.c b/libcpu/blackfin/bf53x/serial.c
index e5547fb887..b8a4c52570 100644
--- a/libcpu/blackfin/bf53x/serial.c
+++ b/libcpu/blackfin/bf53x/serial.c
@@ -211,7 +211,7 @@ static rt_size_t rt_serial_write (rt_device_t dev, rt_off_t pos, const void* buf
 	return (rt_uint32_t)ptr - (rt_uint32_t)buffer;
 }
 
-static rt_err_t rt_serial_control (rt_device_t dev, rt_uint8_t cmd, void *args)
+static rt_err_t rt_serial_control (rt_device_t dev, int cmd, void *args)
 {
 	RT_ASSERT(dev != RT_NULL);
 
diff --git a/libcpu/ppc/ppc405/serial.c b/libcpu/ppc/ppc405/serial.c
index f682796f6e..ac68a13748 100644
--- a/libcpu/ppc/ppc405/serial.c
+++ b/libcpu/ppc/ppc405/serial.c
@@ -94,7 +94,7 @@ static rt_err_t rt_serial_close(rt_device_t dev)
 	return RT_EOK;
 }
 
-static rt_err_t rt_serial_control(rt_device_t dev, rt_uint8_t cmd, void *args)
+static rt_err_t rt_serial_control(rt_device_t dev, int cmd, void *args)
 {
 	return RT_EOK;
 }
diff --git a/libcpu/unicore32/sep6200/serial.c b/libcpu/unicore32/sep6200/serial.c
index 4be71127de..518257b617 100644
--- a/libcpu/unicore32/sep6200/serial.c
+++ b/libcpu/unicore32/sep6200/serial.c
@@ -216,7 +216,7 @@ static rt_size_t rt_serial_write (rt_device_t dev, rt_off_t pos, const void* buf
 	return (rt_uint32_t)ptr - (rt_uint32_t)buffer;
 }
 
-static rt_err_t rt_serial_control (rt_device_t dev, rt_uint8_t cmd, void *args)
+static rt_err_t rt_serial_control (rt_device_t dev, int cmd, void *args)
 {
 	RT_ASSERT(dev != RT_NULL);
 
diff --git a/libcpu/xilinx/microblaze/serial.c b/libcpu/xilinx/microblaze/serial.c
index cd73051f61..17cca9f84d 100755
--- a/libcpu/xilinx/microblaze/serial.c
+++ b/libcpu/xilinx/microblaze/serial.c
@@ -266,7 +266,7 @@ static rt_size_t rt_serial_write (rt_device_t dev, rt_off_t pos, const void* buf
 	return (rt_size_t)ptr - (rt_size_t)buffer;
 }
 
-static rt_err_t rt_serial_control (rt_device_t dev, rt_uint8_t cmd, void *args)
+static rt_err_t rt_serial_control (rt_device_t dev, int cmd, void *args)
 {
 	return RT_EOK;
 }