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https://github.com/espressif/esp-idf.git
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104 lines
3.7 KiB
C
104 lines
3.7 KiB
C
// Copyright 2015-2019 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include <string.h>
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#include <stdint.h>
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#include "sdkconfig.h"
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#include "esp_attr.h"
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#include "esp_log.h"
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#include "bootloader_init.h"
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#include "bootloader_flash_priv.h"
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#include "bootloader_flash_config.h"
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#include "bootloader_random.h"
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#include "bootloader_clock.h"
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#include "bootloader_common.h"
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#include "esp_flash_encrypt.h"
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#include "soc/cpu.h"
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#include "soc/rtc.h"
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#include "hal/wdt_hal.h"
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static const char *TAG = "boot";
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esp_image_header_t WORD_ALIGNED_ATTR bootloader_image_hdr;
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void bootloader_clear_bss_section(void)
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{
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memset(&_bss_start, 0, (&_bss_end - &_bss_start) * sizeof(_bss_start));
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}
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esp_err_t bootloader_read_bootloader_header(void)
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{
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/* load bootloader image header */
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if (bootloader_flash_read(ESP_BOOTLOADER_OFFSET, &bootloader_image_hdr, sizeof(esp_image_header_t), true) != ESP_OK) {
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ESP_LOGE(TAG, "failed to load bootloader image header!");
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return ESP_FAIL;
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}
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return ESP_OK;
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}
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esp_err_t bootloader_check_bootloader_validity(void)
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{
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/* read chip revision from efuse */
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uint8_t revision = bootloader_common_get_chip_revision();
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ESP_LOGI(TAG, "chip revision: %d", revision);
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/* compare with the one set in bootloader image header */
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if (bootloader_common_check_chip_validity(&bootloader_image_hdr, ESP_IMAGE_BOOTLOADER) != ESP_OK) {
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return ESP_FAIL;
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}
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return ESP_OK;
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}
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void bootloader_config_wdt(void)
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{
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/*
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* At this point, the flashboot protection of RWDT and MWDT0 will have been
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* automatically enabled. We can disable flashboot protection as it's not
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* needed anymore. If configured to do so, we also initialize the RWDT to
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* protect the remainder of the bootloader process.
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*/
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//Disable RWDT flashboot protection.
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wdt_hal_context_t rtc_wdt_ctx = {.inst = WDT_RWDT, .rwdt_dev = &RTCCNTL};
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wdt_hal_write_protect_disable(&rtc_wdt_ctx);
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wdt_hal_set_flashboot_en(&rtc_wdt_ctx, false);
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wdt_hal_write_protect_enable(&rtc_wdt_ctx);
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#ifdef CONFIG_BOOTLOADER_WDT_ENABLE
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//Initialize and start RWDT to protect the for bootloader if configured to do so
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ESP_LOGD(TAG, "Enabling RTCWDT(%d ms)", CONFIG_BOOTLOADER_WDT_TIME_MS);
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wdt_hal_init(&rtc_wdt_ctx, WDT_RWDT, 0, false);
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uint32_t stage_timeout_ticks = (uint32_t)((uint64_t)CONFIG_BOOTLOADER_WDT_TIME_MS * rtc_clk_slow_freq_get_hz() / 1000);
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wdt_hal_write_protect_disable(&rtc_wdt_ctx);
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wdt_hal_config_stage(&rtc_wdt_ctx, WDT_STAGE0, stage_timeout_ticks, WDT_STAGE_ACTION_RESET_RTC);
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wdt_hal_enable(&rtc_wdt_ctx);
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wdt_hal_write_protect_enable(&rtc_wdt_ctx);
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#endif
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//Disable MWDT0 flashboot protection. But only after we've enabled the RWDT first so that there's not gap in WDT protection.
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wdt_hal_context_t wdt_ctx = {.inst = WDT_MWDT0, .mwdt_dev = &TIMERG0};
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wdt_hal_write_protect_disable(&wdt_ctx);
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wdt_hal_set_flashboot_en(&wdt_ctx, false);
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wdt_hal_write_protect_enable(&wdt_ctx);
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}
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void bootloader_enable_random(void)
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{
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ESP_LOGI(TAG, "Enabling RNG early entropy source...");
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bootloader_random_enable();
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}
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void bootloader_print_banner(void)
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{
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ESP_LOGI(TAG, "ESP-IDF %s 2nd stage bootloader", IDF_VER);
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ESP_LOGI(TAG, "compile time " __TIME__);
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}
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