diff --git a/components/esp8266/component.mk b/components/esp8266/component.mk
index b4c12229..30b35609 100644
--- a/components/esp8266/component.mk
+++ b/components/esp8266/component.mk
@@ -7,7 +7,7 @@ COMPONENT_SRCDIRS := driver source
 
 LIBS ?=
 ifndef CONFIG_NO_BLOBS
-LIBS += airkiss cirom crypto espnow gcc hal core mirom net80211 \
+LIBS += airkiss crypto espnow gcc hal core net80211 \
         phy pp pwm smartconfig ssc wpa wps
 endif
 
diff --git a/components/esp8266/include/c_types.h b/components/esp8266/include/c_types.h
index 78934168..54ee4c21 100644
--- a/components/esp8266/include/c_types.h
+++ b/components/esp8266/include/c_types.h
@@ -86,7 +86,6 @@ typedef enum {
 #define REG_SET_BIT(_r, _b)     (*(volatile uint32 *)(_r) |= (_b))
 #define REG_CLR_BIT(_r, _b)     (*(volatile uint32 *)(_r) &= ~(_b))
 
-#define __packed            __attribute__((packed))
 #define STORE_ATTR          __attribute__((aligned(4)))
 
 #define SHMEM_ATTR
diff --git a/components/esp8266/ld/eagle.rom.addr.v6.ld b/components/esp8266/ld/eagle.rom.addr.v6.ld
index 6f05cc72..4fc9d36f 100644
--- a/components/esp8266/ld/eagle.rom.addr.v6.ld
+++ b/components/esp8266/ld/eagle.rom.addr.v6.ld
@@ -55,4 +55,6 @@ PROVIDE ( strstr = 0x4000e1e0 );
 
 PROVIDE ( gpio_input_get = 0x40004cf0 );
 PROVIDE ( gpio_pin_wakeup_disable = 0x40004ed4 );
-PROVIDE ( gpio_pin_wakeup_enable = 0x40004e90 );
\ No newline at end of file
+PROVIDE ( gpio_pin_wakeup_enable = 0x40004e90 );
+
+PROVIDE ( ets_printf = 0x400024cc );
\ No newline at end of file
diff --git a/components/esp8266/lib/VERSION b/components/esp8266/lib/VERSION
index e04139ca..3956705b 100644
--- a/components/esp8266/lib/VERSION
+++ b/components/esp8266/lib/VERSION
@@ -1,9 +1,9 @@
 gwen:
     crypto:     5fc5b4f
     espnow:     5fc5b4f
-    core:       06675a3
+    core:       0b78c0f
     minic:      5fc5b4f
-    net80211:   06675a3
+    net80211:   0b78c0f
     pp:         06675a3
     pwm:        5fc5b4f
     smartconfig:9ec59b5
diff --git a/components/esp8266/lib/libcore.a b/components/esp8266/lib/libcore.a
old mode 100755
new mode 100644
index 8ce0e1d8..dfc2ad5d
Binary files a/components/esp8266/lib/libcore.a and b/components/esp8266/lib/libcore.a differ
diff --git a/components/esp8266/lib/libnet80211.a b/components/esp8266/lib/libnet80211.a
index 5bf1f109..a3477c0d 100644
Binary files a/components/esp8266/lib/libnet80211.a and b/components/esp8266/lib/libnet80211.a differ
diff --git a/components/esp8266/source/esp_wifi_os_adapter.c b/components/esp8266/source/esp_wifi_os_adapter.c
index 561b10f9..1f429232 100644
--- a/components/esp8266/source/esp_wifi_os_adapter.c
+++ b/components/esp8266/source/esp_wifi_os_adapter.c
@@ -21,6 +21,10 @@
 #include "freertos/semphr.h"
 #include "freertos/timers.h"
 
+#if defined(CONFIG_NEWLIB_LIBRARY_LEVEL_NORMAL) || defined(CONFIG_NEWLIB_LIBRARY_LEVEL_NANO)
+#include "esp_newlib.h"
+#endif
+
 static uint32_t enter_critical_wrapper(void)
 {
     taskENTER_CRITICAL();
@@ -90,7 +94,9 @@ static void task_resume_all_wrapper(void)
 
 static void os_init_wrapper(void)
 {
-    /* empty function */
+#if defined(CONFIG_NEWLIB_LIBRARY_LEVEL_NORMAL) || defined(CONFIG_NEWLIB_LIBRARY_LEVEL_NANO)
+    esp_newlib_init();
+#endif
 }
 
 static void os_start_wrapper(void)
diff --git a/components/freertos/include/port/freertos/FreeRTOSConfig.h b/components/freertos/include/port/freertos/FreeRTOSConfig.h
index 93d005b6..ca9b8c26 100644
--- a/components/freertos/include/port/freertos/FreeRTOSConfig.h
+++ b/components/freertos/include/port/freertos/FreeRTOSConfig.h
@@ -142,6 +142,8 @@ configKERNEL_INTERRUPT_PRIORITY setting.  Here 15 corresponds to the lowest
 NVIC value of 255. */
 #define configLIBRARY_KERNEL_INTERRUPT_PRIORITY	15
 
+// add it to menuconfig later
+#define CONFIG_FREERTOS_ENABLE_REENT
 #ifdef CONFIG_FREERTOS_ENABLE_REENT
 #define configUSE_NEWLIB_REENTRANT  1
 #endif
diff --git a/components/freertos/include/port/freertos/portmacro.h b/components/freertos/include/port/freertos/portmacro.h
index 9c60a8fd..222a6952 100644
--- a/components/freertos/include/port/freertos/portmacro.h
+++ b/components/freertos/include/port/freertos/portmacro.h
@@ -77,6 +77,17 @@ extern "C" {
 #include    <xtensa/xtruntime.h>
 #include    "xtensa_rtos.h"
 
+#if defined(configUSE_NEWLIB_REENTRANT) && configUSE_NEWLIB_REENTRANT == 1
+#if defined(CONFIG_NEWLIB_LIBRARY_LEVEL_NORMAL) || defined(CONFIG_NEWLIB_LIBRARY_LEVEL_NANO)
+#include "esp_newlib.h"
+
+#define _impure_ptr _global_impure_ptr
+
+#undef _REENT_INIT_PTR
+#define _REENT_INIT_PTR(p) esp_reent_init(p)
+#endif
+#endif
+
 /*-----------------------------------------------------------
  * Port specific definitions.
  *
diff --git a/components/freertos/port/impure.c b/components/freertos/port/impure.c
new file mode 100644
index 00000000..44e511db
--- /dev/null
+++ b/components/freertos/port/impure.c
@@ -0,0 +1,44 @@
+// Copyright 2018-2019 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+
+static struct _reent impure_data;
+struct _reent *_global_impure_ptr = &impure_data;
+
+struct _reent *__getreent()
+{
+    extern char _xt_isr_status;
+
+    /*
+     * Locking mutex(only mutex, not ISR mutex) at the following three
+     * state may cause OS death. So we use a extra _reent data instead
+     * of task private reent data.
+     * 
+     * But although at the state none of "taskSCHEDULER_RUNNING",  exception
+     * can cause CPU swicth context, then Locking mutex may cause OS death.
+     * So we command that use ets_printf(ROM function) instead of "printf"
+     * at exception and system kernal critical state.
+     */
+    if (_xt_isr_status 
+        || !xTaskGetCurrentTaskHandle()
+        || xTaskGetSchedulerState() != taskSCHEDULER_RUNNING)
+        return &impure_data;
+
+    /*
+     * When scheduler starts, _global_impure_ptr = pxCurrentTCB->xNewLib_reent.
+     */
+    return _global_impure_ptr;
+}
diff --git a/components/newlib/component.mk b/components/newlib/component.mk
index 8f87cc2b..d3110c83 100644
--- a/components/newlib/component.mk
+++ b/components/newlib/component.mk
@@ -12,7 +12,7 @@ LIBC_PATH := $(COMPONENT_PATH)/newlib/lib/libc.a
 LIBM_PATH := $(COMPONENT_PATH)/newlib/lib/libm.a
 ADD_NEW_NEWLIB := 1
 else
-ifdef NEWLIB_LIBRARY_LEVEL_NANO
+ifdef CONFIG_NEWLIB_LIBRARY_LEVEL_NANO
 LIBC_PATH := $(COMPONENT_PATH)/newlib/lib/libc_nano.a
 LIBM_PATH := $(COMPONENT_PATH)/newlib/lib/libm.a
 ADD_NEW_NEWLIB := 1
@@ -20,7 +20,8 @@ endif
 endif
 
 ifeq ($(ADD_NEW_NEWLIB),1)
-COMPONENT_ADD_INCLUDEDIRS += newlib/include
+COMPONENT_ADD_INCLUDEDIRS += newlib/include newlib/port/include
+COMPONENT_SRCDIRS += newlib/port
 COMPONENT_ADD_LDFLAGS := $(LIBC_PATH) $(LIBM_PATH) -lnewlib
 COMPONENT_ADD_LINKER_DEPS := $(LIBC_PATH) $(LIBM_PATH)
 endif
diff --git a/components/newlib/newlib/port/esp_newlib.c b/components/newlib/newlib/port/esp_newlib.c
new file mode 100644
index 00000000..f93e32cf
--- /dev/null
+++ b/components/newlib/newlib/port/esp_newlib.c
@@ -0,0 +1,77 @@
+// Copyright 2018-2019 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <reent.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+/*
+ * @brief Initialize global and thread's private reent object data. We add this instead of
+ *        newlib's initialization function to avoid some unnecessary cost and unused function.
+ */
+void esp_reent_init(struct _reent* r)
+{
+    extern void _cleanup(struct _reent *r);
+
+    memset(r, 0, sizeof(*r));
+
+    r->_stdout = _GLOBAL_REENT->_stdout;
+    r->_stderr = _GLOBAL_REENT->_stderr;
+    r->_stdin  = _GLOBAL_REENT->_stdin;
+
+    r->__cleanup = _cleanup;
+    r->__sglue._next = NULL;
+    r->__sglue._niobs = 0;
+    r->__sglue._iobs = NULL;
+    r->_current_locale = "C";
+    r->__sdidinit = 1;
+}
+
+/*
+ * @brief Initialize newlib's platform object data
+ */
+int esp_newlib_init(void)
+{
+    esp_reent_init(_global_impure_ptr);
+
+    _GLOBAL_REENT->_stdout = fopen("uart/0", "w");
+    if (!_GLOBAL_REENT->_stdout)
+        goto err;
+
+    _GLOBAL_REENT->_stderr = fopen("uart/0", "w");
+    if (!_GLOBAL_REENT->_stderr)
+        goto err_fail;
+
+    _GLOBAL_REENT->_stdin = fopen("uart/0", "r");
+    if (!_GLOBAL_REENT->_stdin)
+        goto err_in;
+
+    environ = malloc(sizeof(char*));
+    if (!environ)
+        goto environ_in;
+    environ[0] = NULL;
+
+    return 0;
+
+environ_in:
+    fclose(_GLOBAL_REENT->_stdin);
+err_in:
+    fclose(_GLOBAL_REENT->_stderr);
+err_fail:
+    fclose(_GLOBAL_REENT->_stdout);
+err:
+    return -1;
+}
diff --git a/components/newlib/newlib/port/fputc.c b/components/newlib/newlib/port/fputc.c
new file mode 100644
index 00000000..a5fada9a
--- /dev/null
+++ b/components/newlib/newlib/port/fputc.c
@@ -0,0 +1,26 @@
+// Copyright 2018-2019 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <_ansi.h>
+#include <stdio.h>
+
+int _fputc_r(struct _reent *ptr, int ch, FILE *fp)
+{
+    return fp->_write(ptr, fp->_cookie, (char *)&ch, 1);
+}
+
+int fputc(int ch, FILE *fp)
+{
+    return _fputc_r (_REENT, ch, fp);
+}
diff --git a/components/newlib/newlib/port/include/esp_newlib.h b/components/newlib/newlib/port/include/esp_newlib.h
new file mode 100644
index 00000000..3fa555f2
--- /dev/null
+++ b/components/newlib/newlib/port/include/esp_newlib.h
@@ -0,0 +1,39 @@
+// Copyright 2018-2019 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef _ESP_NEWLIB_H
+#define _ESP_NEWLIB_H
+
+#include <reent.h>
+
+/*
+ * @brief Initialize global and thread's private reent object data. We add this instead of
+ *        newlib's initialization function to avoid some unnecessary cost and unused function.
+ * 
+ * @param r reent pointer
+ * 
+ * @return none
+ */
+void esp_reent_init(struct _reent* r);
+
+/*
+ * @brief Initialize newlib's platform object data
+ * 
+ * @param none
+ * 
+ * @return 0 if successful or -1 if failed
+ */
+int esp_newlib_init(void);
+
+#endif
diff --git a/components/newlib/newlib/port/syscall.c b/components/newlib/newlib/port/syscall.c
new file mode 100644
index 00000000..23b9b67e
--- /dev/null
+++ b/components/newlib/newlib/port/syscall.c
@@ -0,0 +1,123 @@
+// Copyright 2018-2019 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <stdio.h>
+#include <string.h>
+#include <sys/stat.h>
+
+#include "c_types.h"
+
+#include "esp8266/ets_sys.h"
+#include "esp8266/eagle_soc.h"
+#include "esp8266/uart_register.h"
+
+#define PANIC_UART 0
+
+static inline void panit_putc(char c)
+{
+    while (1) {
+        uint32_t fifo_cnt = READ_PERI_REG(UART_STATUS(PANIC_UART)) & (UART_TXFIFO_CNT << UART_TXFIFO_CNT_S);
+
+        if ((fifo_cnt >> UART_TXFIFO_CNT_S & UART_TXFIFO_CNT) < 126)
+            break;
+    }
+
+    WRITE_PERI_REG(UART_FIFO(PANIC_UART) , c);
+}
+
+int _open_r(struct _reent *r, const char *filename, int flags, int mode)
+{
+    return 0;
+}
+
+int _read_r(struct _reent *r, int fd, void *buf, int len)
+{
+    return 0;
+}
+
+int _write_r(struct _reent *r, int fd, void *buf, int len)
+{
+    int i;
+    const char *cbuf = buf;
+
+    for (i = 0; i < len; i++)
+        panit_putc(cbuf[i]);
+
+    return len;
+}
+
+_off_t _lseek_r(struct _reent *r, int fd, _off_t where, int whence)
+{
+    return 0;
+}
+
+int _close_r(struct _reent *r, int fd)
+{
+    return 0;
+}
+
+int _rename_r(struct _reent *r, const char *from, const char *to)
+{
+    return 0;
+}
+
+int _unlink_r(struct _reent *r, const char *filename)
+{
+    return 0;
+}
+
+int _fstat_r(struct _reent *r, int fd, struct stat *s)
+{
+    return 0;
+}
+
+void _sbrk_r(void *ptr, int incr)
+{
+    return ;
+}
+
+void *_malloc_r(struct _reent *r, size_t n)
+{
+    return pvPortMalloc(n);
+}
+
+void *_realloc_r(struct _reent *r, void *old_ptr, size_t n)
+{
+    void *p = pvPortMalloc(n);
+    if (p && old_ptr) {
+        memcpy(p, old_ptr, n);
+        vPortFree(old_ptr);
+    }
+
+    return p;
+}
+
+void *_calloc_r(struct _reent *r, size_t c, size_t s)
+{
+    char *p = pvPortMalloc(c * s);
+    if (p)
+        memset(p, 0, c * s);
+
+    return p;
+}
+
+void *_free_r(struct _reent *r, void *ptr)
+{
+    vPortFree(ptr);
+}
+
+void _exit(int status)
+{
+    while (1);
+}
diff --git a/components/spiffs/library/esp_spiffs.c b/components/spiffs/library/esp_spiffs.c
index 9d3fbbc7..87e4ec1d 100644
--- a/components/spiffs/library/esp_spiffs.c
+++ b/components/spiffs/library/esp_spiffs.c
@@ -162,7 +162,7 @@ void esp_spiffs_deinit(u8_t format)
     }
 }
 
-int _open_r(struct _reent *r, const char *filename, int flags, int mode)
+int _spiffs_open_r(struct _reent *r, const char *filename, int flags, int mode)
 {
     spiffs_mode sm = 0;
     int res;
@@ -201,7 +201,7 @@ int _open_r(struct _reent *r, const char *filename, int flags, int mode)
     return res;
 }
 
-_ssize_t _read_r(struct _reent *r, int fd, void *buf, size_t len)
+_ssize_t _spiffs_read_r(struct _reent *r, int fd, void *buf, size_t len)
 {
 
     ssize_t res;
@@ -215,7 +215,7 @@ _ssize_t _read_r(struct _reent *r, int fd, void *buf, size_t len)
     return res;
 }
 
-_ssize_t _write_r(struct _reent *r, int fd, void *buf, size_t len)
+_ssize_t _spiffs_write_r(struct _reent *r, int fd, void *buf, size_t len)
 {
 
     if (fd < NUM_SYS_FD) {
@@ -226,7 +226,7 @@ _ssize_t _write_r(struct _reent *r, int fd, void *buf, size_t len)
     return res;
 }
 
-_off_t _lseek_r(struct _reent *r, int fd, _off_t where, int whence)
+_off_t _spiffs_lseek_r(struct _reent *r, int fd, _off_t where, int whence)
 {
 
     ssize_t res;
@@ -240,7 +240,7 @@ _off_t _lseek_r(struct _reent *r, int fd, _off_t where, int whence)
     return res;
 }
 
-int _close_r(struct _reent *r, int fd)
+int _spiffs_close_r(struct _reent *r, int fd)
 {
 
     if (fd < NUM_SYS_FD) {
@@ -251,21 +251,21 @@ int _close_r(struct _reent *r, int fd)
     return 0;
 }
 
-int _rename_r(struct _reent *r, const char *from, const char *to)
+int _spiffs_rename_r(struct _reent *r, const char *from, const char *to)
 {
 
     int res = SPIFFS_rename(&fs, (char *) from, (char *) to);
     return res;
 }
 
-int _unlink_r(struct _reent *r, const char *filename)
+int _spiffs_unlink_r(struct _reent *r, const char *filename)
 {
 
     int res = SPIFFS_remove(&fs, (char *) filename);
     return res;
 }
 
-int _fstat_r(struct _reent *r, int fd, struct stat *s)
+int _spiffs_fstat_r(struct _reent *r, int fd, struct stat *s)
 {
 
     int res;