diff --git a/plat/st/stm32mp1/include/boot_api.h b/plat/st/stm32mp1/include/boot_api.h
index 198ffa9bb..763841823 100644
--- a/plat/st/stm32mp1/include/boot_api.h
+++ b/plat/st/stm32mp1/include/boot_api.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017-2021, STMicroelectronics - All Rights Reserved
+ * Copyright (c) 2017-2022, STMicroelectronics - All Rights Reserved
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -13,12 +13,22 @@
 /*
  * Possible value of boot context field 'auth_status'
  */
+#if STM32MP13
+ /* No authentication done */
+#define BOOT_API_CTX_AUTH_NO					0x7CFDD351U
+ /* Authentication done and failed */
+#define BOOT_API_CTX_AUTH_FAILED				0x51330884U
+ /* Authentication done and success */
+#define BOOT_API_CTX_AUTH_SUCCESS				0x67E8CAE1U
+#endif
+#if STM32MP15
 /* No authentication done */
 #define BOOT_API_CTX_AUTH_NO					0x0U
 /* Authentication done and failed */
 #define BOOT_API_CTX_AUTH_FAILED				0x1U
 /* Authentication done and succeeded */
 #define BOOT_API_CTX_AUTH_SUCCESS				0x2U
+#endif
 
 /*
  * Possible value of boot context field 'boot_interface_sel'
@@ -70,11 +80,17 @@
 #define BOOT_API_CTX_EMMC_ERROR_STATUS_HEADER_NOT_FOUND         0x5U
 #define BOOT_API_CTX_EMMC_ERROR_STATUS_HEADER_SIZE_ZERO         0x6U
 #define BOOT_API_CTX_EMMC_ERROR_STATUS_IMAGE_NOT_COMPLETE       0x7U
+#define BOOT_API_CTX_EMMC_ERROR_STATUS_ACK_ERROR                0x8U
 
 /* Image Header related definitions */
 
 /* Definition of header version */
+#if STM32MP13
+#define BOOT_API_HEADER_VERSION					0x00020000U
+#endif
+#if STM32MP15
 #define BOOT_API_HEADER_VERSION					0x00010000U
+#endif
 
 /*
  * Magic number used to detect header in memory
@@ -93,6 +109,49 @@
 #define BOOT_API_ECDSA_ALGO_TYPE_P256NIST			1
 #define BOOT_API_ECDSA_ALGO_TYPE_BRAINPOOL256			2
 
+/*
+ * Extension headers related definitions
+ */
+/* 'bootapi_image_header_t.extension_flag' used for authentication feature */
+#define BOOT_API_AUTHENTICATION_EXTENSION_BIT			BIT(0)
+/* 'bootapi_image_header_t.extension_flag' used for FSBL decryption feature */
+#define BOOT_API_FSBL_DECRYPTION_EXTENSION_BIT			BIT(1)
+/* 'bootapi_image_header_t.extension_flag' used for padding header feature */
+#define BOOT_API_PADDING_EXTENSION_BIT				BIT(31)
+/*
+ * mask of bits of field 'bootapi_image_header_t.extension_flag'
+ * used for extension headers
+ */
+#define BOOT_API_ALL_EXTENSIONS_MASK \
+	(BOOT_API_AUTHENTICATION_EXTENSION_BIT | \
+	 BOOT_API_FSBL_DECRYPTION_EXTENSION_BIT | \
+	 BOOT_API_PADDING_EXTENSION_BIT)
+/*
+ * Magic number of FSBL decryption extension header
+ * The value shall gives the four bytes 'S','T',0x00,0x01 in memory
+ */
+#define BOOT_API_FSBL_DECRYPTION_HEADER_MAGIC_NB		0x01005453U
+
+/*
+ * Magic number of PKH revocation extension header
+ * The value shall gives the four bytes 'S','T',0x00,0x02 in memory
+ */
+#define BOOT_API_AUTHENTICATION_HEADER_MAGIC_NB			0x02005453U
+
+/* Max number of ECDSA public key hash in table */
+#define BOOT_API_AUTHENTICATION_NB_PKH_MAX			8U
+
+/* ECDSA public key hash table size in bytes */
+#define BOOT_API_AUTHENTICATION_TABLE_SIZE_BYTES \
+	(BOOT_API_AUTHENTICATION_NB_PKH_MAX * \
+	 BOOT_API_SHA256_DIGEST_SIZE_IN_BYTES)
+
+/*
+ * Magic number of padding extension header
+ * The value shall gives the four bytes 'S','T',0xFF,0xFF in memory
+ */
+#define BOOT_API_PADDING_HEADER_MAGIC_NB			0xFFFF5453U
+
 /*
  * Cores secure magic numbers
  * Constant to be stored in bakcup register
@@ -157,11 +216,20 @@ typedef struct {
 	 */
 	uint16_t boot_interface_selected;
 	uint16_t boot_interface_instance;
+#if STM32MP13
+	uint32_t reserved1[12];
+#endif
+#if STM32MP15
 	uint32_t reserved1[13];
+#endif
 	uint32_t otp_afmux_values[3];
-	uint32_t reserved[5];
+	uint32_t reserved[3];
+#if STM32MP15
+	uint32_t reserved2[2];
+#endif
 	uint32_t auth_status;
 
+#if STM32MP15
 	/*
 	 * Pointers to bootROM External Secure Services
 	 * - ECDSA check key
@@ -179,7 +247,7 @@ typedef struct {
 						uint8_t *signature,
 						uint32_t ecc_algo,
 						uint32_t *entry_in);
-
+#endif
 	/*
 	 * Information specific to an SD boot
 	 * Updated each time an SD boot is at least attempted,
@@ -227,10 +295,10 @@ typedef struct {
 	uint8_t image_signature[BOOT_API_ECDSA_SIGNATURE_LEN_IN_BYTES];
 	/*
 	 * Checksum of payload
-	 * 32-bit sum all all payload bytes considered as 8 bit unigned numbers,
-	 * discarding any overflow bits.
+	 * 32-bit sum all payload bytes considered as 8 bit unsigned
+	 * numbers, discarding any overflow bits.
 	 * Use to check UART/USB downloaded image integrity when signature
-	 * is not used (i.e bit 0 : 'No_sig_check' = 1 in option flags)
+	 * is not used
 	 */
 	uint32_t payload_checksum;
 	/* Image header version : should have value BOOT_API_HEADER_VERSION */
@@ -255,6 +323,25 @@ typedef struct {
 	 * counter value in OTP_CFG4 prior executing the downloaded image
 	 */
 	uint32_t image_version;
+
+#if STM32MP13
+	/*
+	 * Extension flags :
+	 *
+	 * Bit 0 : Authentication extension header
+	 *      value 0 : No signature check request
+	 * Bit 1 : Encryption extension header
+	 * Bit 2 : Padding extension header
+	 */
+	uint32_t extension_flags;
+	/* Length in bytes of all extension headers */
+	uint32_t extension_headers_length;
+	/* Add binary type information */
+	uint32_t binary_type;
+	/* Pad up to 128 byte total size */
+	uint8_t pad[16];
+#endif
+#if STM32MP15
 	/*
 	 * Option flags:
 	 * Bit 0 : No signature check request : 'No_sig_check'
@@ -280,6 +367,7 @@ typedef struct {
 	uint8_t pad[83];
 	/* Add binary type information */
 	uint8_t binary_type;
+#endif
 } __packed boot_api_image_header_t;
 
 #endif /* BOOT_API_H */