diff --git a/components/esp8266/include/esp8266/efuse_register.h b/components/esp8266/include/esp8266/efuse_register.h
new file mode 100644
index 00000000..00ce05ac
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+++ b/components/esp8266/include/esp8266/efuse_register.h
@@ -0,0 +1,51 @@
+// Copyright 2015-2016 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 __EFUSE_REGISTER_H__
+#define __EFUSE_REGISTER_H__
+
+#define DR_REG_EFUSE_BASE   0x3FF00050
+
+#define EFUSE_DATA0_REG     (DR_REG_EFUSE_BASE + 0x000)
+#define EFUSE_IS_ESP8285    (1 << 4)
+
+#define EFUSE_DATA1_REG     (DR_REG_EFUSE_BASE + 0x004)
+
+#define EFUSE_VERSION       0xF
+#define EFUSE_VERSION_M     ((EFUSE_VERSION_V) << (EFUSE_VERSION_S))
+#define EFUSE_VERSION_V     0xF
+#define EFUSE_VERSION_S     24
+
+#define EFUSE_VERSION_0     0
+#define EFUSE_VERSION_1     1
+#define EFUSE_VERSION_2     2
+
+#define EFUSE_DATA2_REG     (DR_REG_EFUSE_BASE + 0x008)
+
+#define EFUSE_USE_TYPE2     (1 << 15)   /*< 0: type1, 1: type2 */
+#define EFUSE_IS_24PINS     (1 << 14)   /*< 0: 32 pins, 1: 24 pins */
+#define EFUSE_4_GPIO_PAD    (1 << 13)   /*< 0: 2 GPIO pad, GPIO0 & GPIO2, 1: 4 GPIO pad, extra GPIO4 & GPIO5 */
+#define EFUSE_IS_48BITS_MAC (1 << 12)   /*< 0: 24 bits mac, 1: 32 bits mac */
+
+#define EFUSE_DATA3_REG     (DR_REG_EFUSE_BASE + 0x00C)
+
+#define EFUSE_EMB_FLASH_SIZE    0x3
+#define EFUSE_EMB_FLASH_SIZE_M  ((EFUSE_FLASH_SIZE_V) << (EFUSE_FLASH_SIZE_S))
+#define EFUSE_EMB_FLASH_SIZE_V  0x3
+#define EFUSE_EMB_FLASH_SIZE_S  26
+
+#define EFUSE_EMB_FLASH_SIZE_2MB    0
+#define EFUSE_EMB_FLASH_SIZE_4MB    1
+
+#endif /*__EFUSE_REGISTER_H__ */