diff --git a/demo/stm32f10x/non_os/components/easyflash/port/flash_port.c b/demo/stm32f10x/non_os/components/easyflash/port/flash_port.c
index dac081a..ac85463 100644
--- a/demo/stm32f10x/non_os/components/easyflash/port/flash_port.c
+++ b/demo/stm32f10x/non_os/components/easyflash/port/flash_port.c
@@ -66,11 +66,12 @@ static char log_buf[128];
  * @param erase_min_size the minimum size of Flash erasure
  * @param default_env default ENV set for user
  * @param default_env_size default ENV size
+ * @param log_total_size saved log area size
  *
  * @return result
  */
 FlashErrCode flash_port_init(uint32_t *env_addr, size_t *env_total_size, size_t *erase_min_size,
-        flash_env const **default_env, size_t *default_env_size) {
+        flash_env const **default_env, size_t *default_env_size, size_t *log_size) {
     FlashErrCode result = FLASH_NO_ERR;
 
     FLASH_ASSERT(FLASH_USER_SETTING_ENV_SIZE % 4 == 0);
@@ -98,7 +99,6 @@ FlashErrCode flash_port_init(uint32_t *env_addr, size_t *env_total_size, size_t
 FlashErrCode flash_read(uint32_t addr, uint32_t *buf, size_t size) {
     FlashErrCode result = FLASH_NO_ERR;
 
-    FLASH_ASSERT(size >= 4);
     FLASH_ASSERT(size % 4 == 0);
 
     /*copy from flash to ram */
@@ -162,6 +162,8 @@ FlashErrCode flash_write(uint32_t addr, const uint32_t *buf, size_t size) {
     FlashErrCode result = FLASH_NO_ERR;
     size_t i;
     uint32_t read_data;
+	
+	FLASH_ASSERT(size % 4 == 0);
 
     FLASH_Unlock();
     FLASH_ClearFlag(FLASH_FLAG_BSY | FLASH_FLAG_EOP | FLASH_FLAG_PGERR | FLASH_FLAG_WRPRTERR);
diff --git a/demo/stm32f10x/rtt/components/easyflash/port/flash_port.c b/demo/stm32f10x/rtt/components/easyflash/port/flash_port.c
index 382a61a..d0bd85a 100644
--- a/demo/stm32f10x/rtt/components/easyflash/port/flash_port.c
+++ b/demo/stm32f10x/rtt/components/easyflash/port/flash_port.c
@@ -66,11 +66,12 @@ static struct rt_semaphore env_cache_lock;
  * @param erase_min_size the minimum size of Flash erasure
  * @param default_env default ENV set for user
  * @param default_env_size default ENV size
+ * @param log_total_size saved log area size
  *
  * @return result
  */
 FlashErrCode flash_port_init(uint32_t *env_addr, size_t *env_total_size, size_t *erase_min_size,
-        flash_env const **default_env, size_t *default_env_size) {
+        flash_env const **default_env, size_t *default_env_size, size_t *log_size) {
     FlashErrCode result = FLASH_NO_ERR;
 
     FLASH_ASSERT(FLASH_USER_SETTING_ENV_SIZE % 4 == 0);
@@ -101,7 +102,6 @@ FlashErrCode flash_port_init(uint32_t *env_addr, size_t *env_total_size, size_t
 FlashErrCode flash_read(uint32_t addr, uint32_t *buf, size_t size) {
     FlashErrCode result = FLASH_NO_ERR;
 
-    FLASH_ASSERT(size >= 4);
     FLASH_ASSERT(size % 4 == 0);
 
     /*copy from flash to ram */
@@ -166,6 +166,8 @@ FlashErrCode flash_write(uint32_t addr, const uint32_t *buf, size_t size) {
     size_t i;
     uint32_t read_data;
 
+	FLASH_ASSERT(size % 4 == 0);
+	
     FLASH_Unlock();
     FLASH_ClearFlag(FLASH_FLAG_BSY | FLASH_FLAG_EOP | FLASH_FLAG_PGERR | FLASH_FLAG_WRPRTERR);
     for (i = 0; i < size; i += 4, buf++, addr += 4) {
diff --git a/demo/stm32f4xx/components/easyflash/port/flash_port.c b/demo/stm32f4xx/components/easyflash/port/flash_port.c
index 2afbd32..00584ad 100644
--- a/demo/stm32f4xx/components/easyflash/port/flash_port.c
+++ b/demo/stm32f4xx/components/easyflash/port/flash_port.c
@@ -88,11 +88,12 @@ static uint32_t stm32_get_sector_size(uint32_t sector);
  * @param erase_min_size the minimum size of Flash erasure
  * @param default_env default ENV set for user
  * @param default_env_size default ENV size
+ * @param log_total_size saved log area size
  *
  * @return result
  */
 FlashErrCode flash_port_init(uint32_t *env_addr, size_t *env_total_size, size_t *erase_min_size,
-        flash_env const **default_env, size_t *default_env_size) {
+        flash_env const **default_env, size_t *default_env_size, size_t *log_size) {
     FlashErrCode result = FLASH_NO_ERR;
 
     FLASH_ASSERT(FLASH_USER_SETTING_ENV_SIZE % 4 == 0);
@@ -123,7 +124,6 @@ FlashErrCode flash_port_init(uint32_t *env_addr, size_t *env_total_size, size_t
 FlashErrCode flash_read(uint32_t addr, uint32_t *buf, size_t size) {
     FlashErrCode result = FLASH_NO_ERR;
 
-    FLASH_ASSERT(size >= 4);
     FLASH_ASSERT(size % 4 == 0);
 
     /*copy from flash to ram */
@@ -187,6 +187,8 @@ FlashErrCode flash_write(uint32_t addr, const uint32_t *buf, size_t size) {
     size_t i;
     uint32_t read_data;
 
+	FLASH_ASSERT(size % 4 == 0);
+	
     FLASH_Unlock();
     FLASH_ClearFlag(FLASH_FLAG_EOP | FLASH_FLAG_OPERR | FLASH_FLAG_WRPERR | FLASH_FLAG_PGAERR
                     | FLASH_FLAG_PGPERR | FLASH_FLAG_PGSERR);
diff --git a/easyflash/inc/flash.h b/easyflash/inc/flash.h
index 5a2b78d..ba88fbf 100644
--- a/easyflash/inc/flash.h
+++ b/easyflash/inc/flash.h
@@ -37,7 +37,7 @@ extern "C" {
 /* using IAP function */
 #define FLASH_USING_IAP
 /* using save log function */
-#define FLASH_USING_LOG
+/* #define FLASH_USING_LOG */
 /* using CRC32 check when load environment variable from Flash */
 #define FLASH_ENV_USING_CRC_CHECK
 /* the user setting size of ENV, must be word alignment */