esp-idf/components/bootloader_support/include/esp_image_format.h

133 lines
4.8 KiB
C

// 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 __ESP32_IMAGE_FORMAT_H
#define __ESP32_IMAGE_FORMAT_H
#include <stdbool.h>
#include <esp_err.h>
#define ESP_ERR_IMAGE_BASE 0x2000
#define ESP_ERR_IMAGE_FLASH_FAIL (ESP_ERR_IMAGE_BASE + 1)
#define ESP_ERR_IMAGE_INVALID (ESP_ERR_IMAGE_BASE + 2)
/* Support for app/bootloader image parsing
Can be compiled as part of app or bootloader code.
*/
/* SPI flash mode, used in esp_image_header_t */
typedef enum {
ESP_IMAGE_SPI_MODE_QIO,
ESP_IMAGE_SPI_MODE_QOUT,
ESP_IMAGE_SPI_MODE_DIO,
ESP_IMAGE_SPI_MODE_DOUT,
ESP_IMAGE_SPI_MODE_FAST_READ,
ESP_IMAGE_SPI_MODE_SLOW_READ
} esp_image_spi_mode_t;
/* SPI flash clock frequency */
enum {
ESP_IMAGE_SPI_SPEED_40M,
ESP_IMAGE_SPI_SPEED_26M,
ESP_IMAGE_SPI_SPEED_20M,
ESP_IMAGE_SPI_SPEED_80M = 0xF
} esp_image_spi_freq_t;
/* Supported SPI flash sizes */
typedef enum {
ESP_IMAGE_FLASH_SIZE_1MB = 0,
ESP_IMAGE_FLASH_SIZE_2MB,
ESP_IMAGE_FLASH_SIZE_4MB,
ESP_IMAGE_FLASH_SIZE_8MB,
ESP_IMAGE_FLASH_SIZE_16MB,
ESP_IMAGE_FLASH_SIZE_MAX
} esp_image_flash_size_t;
#define ESP_IMAGE_HEADER_MAGIC 0xE9
/* Main header of binary image */
typedef struct {
uint8_t magic;
uint8_t segment_count;
uint8_t spi_mode; /* flash read mode (esp_image_spi_mode_t as uint8_t) */
uint8_t spi_speed: 4; /* flash frequency (esp_image_spi_freq_t as uint8_t) */
uint8_t spi_size: 4; /* flash chip size (esp_image_flash_size_t as uint8_t) */
uint32_t entry_addr;
uint8_t encrypt_flag; /* encrypt flag */
uint8_t extra_header[15]; /* ESP32 additional header, unused by second bootloader */
} esp_image_header_t;
/* Header of binary image segment */
typedef struct {
uint32_t load_addr;
uint32_t data_len;
} esp_image_segment_header_t;
/**
* @brief Read an ESP image header from flash.
*
* @param src_addr Address in flash to load image header. Must be 4 byte aligned.
* @param[out] image_header Pointer to an esp_image_header_t struture to be filled with data. If the function fails, contents are undefined.
*
* @return ESP_OK if image header was loaded, ESP_ERR_IMAGE_FLASH_FAIL
* if a SPI flash error occurs, ESP_ERR_IMAGE_INVALID if the image header
* appears invalid.
*/
esp_err_t esp_image_load_header(uint32_t src_addr, esp_image_header_t *image_header);
/**
* @brief Read the segment header and data offset of a segment in the image.
*
* @param index Index of the segment to load information for.
* @param src_addr Base address in flash of the image.
* @param[in] image_header Pointer to the flash image header, already loaded by @ref esp_image_load_header().
* @param[out] segment_header Pointer to a segment header structure to be filled with data. If the function fails, contents are undefined.
* @param[out] segment_data_offset Pointer to the data offset of the segment.
*
* @return ESP_OK if segment_header & segment_data_offset were loaded successfully, ESP_ERR_IMAGE_FLASH_FAIL if a SPI flash error occurs, ESP_ERR_IMAGE_INVALID if the image header appears invalid, ESP_ERR_INVALID_ARG if the index is invalid.
*/
esp_err_t esp_image_load_segment_header(uint8_t index, uint32_t src_addr, const esp_image_header_t *image_header, esp_image_segment_header_t *segment_header, uint32_t *segment_data_offset);
/**
* @brief Return length of an image in flash. Non-cryptographically validates image integrity in the process.
*
* If the image has a secure boot signature appended, the signature is not checked and this length is not included in the result.
*
* Image validation checks:
* - Magic byte
* - No single segment longer than 16MB
* - Total image no longer than 16MB
* - 8 bit image checksum is valid
*
* @param src_addr Offset of the start of the image in flash. Must be 4 byte aligned.
* @param[out] length Length of the image, set to a value if the image is valid. Can be null.
*
* @return ESP_OK if image is valid, ESP_FAIL or ESP_ERR_IMAGE_INVALID on errors.
*
*/
esp_err_t esp_image_basic_verify(uint32_t src_addr, uint32_t *length);
typedef struct {
uint32_t drom_addr;
uint32_t drom_load_addr;
uint32_t drom_size;
uint32_t irom_addr;
uint32_t irom_load_addr;
uint32_t irom_size;
} esp_image_flash_mapping_t;
#endif