bootloader_support: added esp32-c3 support

components/bootloader_support/src/esp32c3/secure_boot.c

@@ -0,0 +1,45 @@
+// Copyright 2015-2020 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 "esp32c3/rom/secure_boot.h"
+#include "esp_rom_efuse.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;
+    }
+
+    ets_efuse_clear_program_registers();
+    REG_SET_BIT(EFUSE_PGM_DATA3_REG, EFUSE_SECURE_BOOT_EN);
+    ets_efuse_program(ETS_EFUSE_BLOCK0);
+
+    assert(esp_rom_efuse_is_secure_boot_enabled());
+    ESP_LOGI(TAG, "Secure boot permanently enabled");
+
+    return ESP_OK;
+}