components/bootloader_support/src/flash_partitions.c

   1 // Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
   2 //
   3 // Licensed under the Apache License, Version 2.0 (the "License");
   4 // you may not use this file except in compliance with the License.
   5 // You may obtain a copy of the License at
   6
   7 //     http://www.apache.org/licenses/LICENSE-2.0
   8 //
   9 // Unless required by applicable law or agreed to in writing, software
  10 // distributed under the License is distributed on an "AS IS" BASIS,
  11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12 // See the License for the specific language governing permissions and
  13 // limitations under the License.
  14 #include "esp_flash_partitions.h"
  15 #include "esp_log.h"
  16 #include "rom/spi_flash.h"
  17
  18 static const char *TAG = "flash_parts";
  19
  20 esp_err_t esp_partition_table_basic_verify(const esp_partition_info_t *partition_table, bool log_errors, int *num_partitions)
  21 {
  22   int num_parts;
  23   uint32_t chip_size = g_rom_flashchip.chip_size;
  24   *num_partitions = 0;
  25
  26   for(num_parts = 0; num_parts < ESP_PARTITION_TABLE_MAX_ENTRIES; num_parts++) {
  27     const esp_partition_info_t *part = &partition_table[num_parts];
  28
  29     if (part->magic == 0xFFFF
  30         && part->type == PART_TYPE_END
  31         && part->subtype == PART_SUBTYPE_END) {
  32       /* TODO: check md5 */
  33       ESP_LOGD(TAG, "partition table verified, %d entries", num_parts);
  34       *num_partitions = num_parts;
  35       return ESP_OK;
  36     }
  37
  38     if (part->magic != ESP_PARTITION_MAGIC) {
  39         if (log_errors) {
  40             ESP_LOGE(TAG, "partition %d invalid magic number 0x%x", num_parts, part->magic);
  41         }
  42         return ESP_ERR_INVALID_STATE;
  43     }
  44
  45     const esp_partition_pos_t *pos = &part->pos;
  46     if (pos->offset > chip_size || pos->offset + pos->size > chip_size) {
  47         if (log_errors) {
  48             ESP_LOGE(TAG, "partition %d invalid - offset 0x%x size 0x%x exceeds flash chip size 0x%x",
  49                      num_parts, pos->offset, pos->size, chip_size);
  50         }
  51         return ESP_ERR_INVALID_SIZE;
  52     }
  53   }
  54
  55   if (log_errors) {
  56       ESP_LOGE(TAG, "partition table has no terminating entry, not valid");
  57   }
  58   return ESP_ERR_INVALID_STATE;
  59 }
  60