Files
esp-idf/components/bootloader_support/src/esp32s2/secure_boot.c

54 lines
1.7 KiB
C

// Copyright 2015-2018 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 "esp_secure_boot.h"
#include "esp_log.h"
#include "esp32s2/rom/secure_boot.h"
static const char *TAG = "secure_boot";
esp_err_t esp_secure_boot_permanently_enable(void)
{
uint8_t hash[32];
if (esp_rom_efuse_is_secure_boot_enabled())
{
ESP_LOGI(TAG, "secure boot is already enabled, continuing..");
return ESP_OK;
}
ESP_LOGI(TAG, "Verifying bootloader signature...\n");
int r = ets_secure_boot_verify_bootloader(hash, false);
if (r != ESP_OK) {
ESP_LOGE(TAG, "Failed to verify bootloader signature");
return r;
}
esp_efuse_batch_write_begin(); /* Batch all efuse writes at the end of this function */
esp_efuse_write_field_bit(ESP_EFUSE_SECURE_BOOT_EN);
esp_efuse_write_field_bit(ESP_EFUSE_DIS_BOOT_REMAP);
esp_efuse_write_field_bit(ESP_EFUSE_DIS_LEGACY_SPI_BOOT);
// TODO: also disable JTAG here, etc
esp_err_t err = esp_efuse_batch_write_commit();
if (err == ESP_OK) {
assert(esp_rom_efuse_is_secure_boot_enabled());
ESP_LOGI(TAG, "Secure boot permanently enabled");
}
return ESP_OK;
}