diff --git a/hardware/esp8266com/esp8266/cores/esp8266/core_esp8266_main.cpp b/hardware/esp8266com/esp8266/cores/esp8266/core_esp8266_main.cpp
index b67543f8b..3423d70a1 100644
--- a/hardware/esp8266com/esp8266/cores/esp8266/core_esp8266_main.cpp
+++ b/hardware/esp8266com/esp8266/cores/esp8266/core_esp8266_main.cpp
@@ -128,12 +128,18 @@ extern "C" {
 void user_init(void) {
     uart_div_modify(0, UART_CLK_FREQ / (74480));
 
-    system_rtc_mem_read(0, &resetInfo, sizeof(struct rst_info));
-    if(resetInfo.reason == REASON_WDT_RST || resetInfo.reason == REASON_EXCEPTION_RST) {
-        os_printf("Last Reset:\n - flag=%d\n - Fatal exception (%d):\n - epc1=0x%08x,epc2=0x%08x,epc3=0x%08x,excvaddr=0x%08x,depc=0x%08x\n", resetInfo.reason, resetInfo.exccause, resetInfo.epc1, resetInfo.epc2, resetInfo.epc3, resetInfo.excvaddr, resetInfo.depc);
+    struct rst_info *rtc_info = system_get_rst_info();
+    os_printf("Last reset reason: 0x%02X\n", rtc_info->reason);
+
+    if (rtc_info->reason == REASON_WDT_RST ||
+        rtc_info->reason == REASON_EXCEPTION_RST ||
+        rtc_info->reason == REASON_SOFT_WDT_RST) {
+        if (rtc_info->reason == REASON_EXCEPTION_RST) {
+            os_printf("Fatal exception (%d):\n", rtc_info->exccause);
+        }
+        os_printf("epc1=0x%08x, epc2=0x%08x, epc3=0x%08x, excvaddr=0x%08x, depc=0x%08x\n",
+                rtc_info->epc1, rtc_info->epc2, rtc_info->epc3, rtc_info->excvaddr, rtc_info->depc);
     }
-    struct rst_info info = { 0 };
-    system_rtc_mem_write(0, &info, sizeof(struct rst_info));
 
     uart_div_modify(0, UART_CLK_FREQ / (115200));
 
diff --git a/hardware/esp8266com/esp8266/tools/sdk/changelog.txt b/hardware/esp8266com/esp8266/tools/sdk/changelog.txt
index 185750669..9f2ad6bf8 100644
--- a/hardware/esp8266com/esp8266/tools/sdk/changelog.txt
+++ b/hardware/esp8266com/esp8266/tools/sdk/changelog.txt
@@ -1,3 +1,35 @@
+esp_iot_sdk_v1.1.2_15_06_16_p1 Release Note 
+-------------------------------------------
+Here is a patch based on SDK_v1.1.2 resolved issue that "wifi_station_scan" cause loss of wireless connectivity.
+
+Please replace them in esp_iot_sdk/lib folder.
+
+Sorry for the inconvenience.
+
+
+
+
+esp_iot_sdk_v1.1.2_15_06_12 Release Note 
+-------------------------------------------
+
+Optimization:
+1. support certificate issuer verification for SSL
+2. Update SPI driver, support overlap mode
+
+Add APIs:
+1. wifi_station_set_hostname : set ESP8266 station DHCP hostname
+2. wifi_station_get_hostname : get ESP8266 station DHCP hostname
+3. spi_flash_set_read_func ：set user specified reading SPI function on overlap mode
+4. espconn_secure_ca_disable : disable SSL CA verify
+5. espconn_secure_ca_enable : enable SSL CA verify
+
+Add Documentation:
+1. SPI overlap introduction: \esp_iot_sdk\document, sorry that it has only Chinese version now，we will add English version of this documentation ASAP.
+2. SSL introduction: \esp_iot_sdk\document
+
+
+
+
 esp_iot_sdk_v1.1.1_15_06_05 Release Note 
 -------------------------------------------
 
diff --git a/hardware/esp8266com/esp8266/tools/sdk/include/espconn.h b/hardware/esp8266com/esp8266/tools/sdk/include/espconn.h
index a85c82392..82212103b 100644
--- a/hardware/esp8266com/esp8266/tools/sdk/include/espconn.h
+++ b/hardware/esp8266com/esp8266/tools/sdk/include/espconn.h
@@ -23,6 +23,9 @@ typedef void (* espconn_reconnect_callback)(void *arg, sint8 err);
 #define ESPCONN_ARG        -12   /* Illegal argument.        */
 #define ESPCONN_ISCONN     -15   /* Already connected.       */
 
+#define ESPCONN_HANDSHAKE  -28   /* ssl handshake failed	 */
+#define ESPCONN_PROTO_MSG  -61   /* ssl application invalid	 */
+
 /** Protocol family and type of the espconn */
 enum espconn_type {
     ESPCONN_INVALID    = 0,
@@ -455,6 +458,28 @@ bool espconn_secure_set_size(uint8 level, uint16 size);
 
 sint16 espconn_secure_get_size(uint8 level);
 
+/******************************************************************************
+ * FunctionName : espconn_secure_ca_enable
+ * Description  : enable the certificate authenticate and set the flash sector
+ * 				  as client or server
+ * Parameters   : level -- set for client or server
+ *				  1: client,2:server,3:client and server
+ *				  flash_sector -- flash sector for save certificate
+ * Returns      : result true or false
+*******************************************************************************/
+
+bool espconn_secure_ca_enable(uint8 level, uint8 flash_sector );
+
+/******************************************************************************
+ * FunctionName : espconn_secure_ca_disable
+ * Description  : disable the certificate authenticate  as client or server
+ * Parameters   : level -- set for client or server
+ *				  1: client,2:server,3:client and server
+ * Returns      : result true or false
+*******************************************************************************/
+
+bool espconn_secure_ca_disable(uint8 level);
+
 /******************************************************************************
  * FunctionName : espconn_secure_accept
  * Description  : The function given as the listen
diff --git a/hardware/esp8266com/esp8266/tools/sdk/include/spi_flash.h b/hardware/esp8266com/esp8266/tools/sdk/include/spi_flash.h
index 347e1b920..bb920fef5 100644
--- a/hardware/esp8266com/esp8266/tools/sdk/include/spi_flash.h
+++ b/hardware/esp8266com/esp8266/tools/sdk/include/spi_flash.h
@@ -30,4 +30,12 @@ SpiFlashOpResult spi_flash_erase_sector(uint16 sec);
 SpiFlashOpResult spi_flash_write(uint32 des_addr, uint32 *src_addr, uint32 size);
 SpiFlashOpResult spi_flash_read(uint32 src_addr, uint32 *des_addr, uint32 size);
 
+typedef SpiFlashOpResult (* user_spi_flash_read)(
+		SpiFlashChip *spi,
+		uint32 src_addr,
+		uint32 *des_addr,
+        uint32 size);
+
+void spi_flash_set_read_func(user_spi_flash_read read);
+
 #endif
diff --git a/hardware/esp8266com/esp8266/tools/sdk/lib/libjson.a b/hardware/esp8266com/esp8266/tools/sdk/lib/libjson.a
index e8fa9d8da..5b35fba2c 100644
Binary files a/hardware/esp8266com/esp8266/tools/sdk/lib/libjson.a and b/hardware/esp8266com/esp8266/tools/sdk/lib/libjson.a differ
diff --git a/hardware/esp8266com/esp8266/tools/sdk/lib/liblwip.a b/hardware/esp8266com/esp8266/tools/sdk/lib/liblwip.a
index a6c42f9e9..c956810ea 100644
Binary files a/hardware/esp8266com/esp8266/tools/sdk/lib/liblwip.a and b/hardware/esp8266com/esp8266/tools/sdk/lib/liblwip.a differ
diff --git a/hardware/esp8266com/esp8266/tools/sdk/lib/libmain.a b/hardware/esp8266com/esp8266/tools/sdk/lib/libmain.a
index 90caec3de..14af9b0bc 100644
Binary files a/hardware/esp8266com/esp8266/tools/sdk/lib/libmain.a and b/hardware/esp8266com/esp8266/tools/sdk/lib/libmain.a differ
diff --git a/hardware/esp8266com/esp8266/tools/sdk/lib/libnet80211.a b/hardware/esp8266com/esp8266/tools/sdk/lib/libnet80211.a
index 648852e52..14a1d09d3 100644
Binary files a/hardware/esp8266com/esp8266/tools/sdk/lib/libnet80211.a and b/hardware/esp8266com/esp8266/tools/sdk/lib/libnet80211.a differ
diff --git a/hardware/esp8266com/esp8266/tools/sdk/lib/libpp.a b/hardware/esp8266com/esp8266/tools/sdk/lib/libpp.a
index e42233ab3..9238f6c53 100644
Binary files a/hardware/esp8266com/esp8266/tools/sdk/lib/libpp.a and b/hardware/esp8266com/esp8266/tools/sdk/lib/libpp.a differ
diff --git a/hardware/esp8266com/esp8266/tools/sdk/lib/libsmartconfig.a b/hardware/esp8266com/esp8266/tools/sdk/lib/libsmartconfig.a
index 03f296fd9..7fb8490a7 100644
Binary files a/hardware/esp8266com/esp8266/tools/sdk/lib/libsmartconfig.a and b/hardware/esp8266com/esp8266/tools/sdk/lib/libsmartconfig.a differ
diff --git a/hardware/esp8266com/esp8266/tools/sdk/lib/libssl.a b/hardware/esp8266com/esp8266/tools/sdk/lib/libssl.a
index 1608d8484..add670e37 100644
Binary files a/hardware/esp8266com/esp8266/tools/sdk/lib/libssl.a and b/hardware/esp8266com/esp8266/tools/sdk/lib/libssl.a differ
diff --git a/hardware/esp8266com/esp8266/tools/sdk/lib/libupgrade.a b/hardware/esp8266com/esp8266/tools/sdk/lib/libupgrade.a
index d0d2d5bda..e0dda74eb 100644
Binary files a/hardware/esp8266com/esp8266/tools/sdk/lib/libupgrade.a and b/hardware/esp8266com/esp8266/tools/sdk/lib/libupgrade.a differ
diff --git a/hardware/esp8266com/esp8266/tools/sdk/lib/libwpa.a b/hardware/esp8266com/esp8266/tools/sdk/lib/libwpa.a
index c6f1bb620..b5a513509 100644
Binary files a/hardware/esp8266com/esp8266/tools/sdk/lib/libwpa.a and b/hardware/esp8266com/esp8266/tools/sdk/lib/libwpa.a differ
diff --git a/hardware/esp8266com/esp8266/tools/sdk/version b/hardware/esp8266com/esp8266/tools/sdk/version
index 1aeff03a8..d3b2eb935 100644
--- a/hardware/esp8266com/esp8266/tools/sdk/version
+++ b/hardware/esp8266com/esp8266/tools/sdk/version
@@ -1 +1 @@
-1.1.1_15_06_05
\ No newline at end of file
+1.1.2_15_06_16_p1
\ No newline at end of file