Primary Git Repository for the Zephyr Project. Zephyr is a new generation, scalable, optimized, secure RTOS for multiple hardware architectures.
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/*
* Copyright (c) 2021-2025 Espressif Systems (Shanghai) Co., Ltd.
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <soc.h>
#include <soc_init.h>
#include <flash_init.h>
#include <esp_private/cache_utils.h>
#include <esp_private/system_internal.h>
#include <esp_timer.h>
#include <psram.h>
#include <zephyr/drivers/interrupt_controller/intc_esp32.h>
#include <zephyr/sys/printk.h>
extern void z_prep_c(void);
extern void esp_reset_reason_init(void);
void IRAM_ATTR __esp_platform_app_start(void)
{
/*
* Configure the mode of instruction cache :
* cache size, cache associated ways, cache line size.
*/
esp_config_instruction_cache_mode();
/*
* If we need use SPIRAM, we should use data cache, or if we want to
* access rodata, we also should use data cache.
* Configure the mode of data : cache size, cache associated ways, cache
* line size.
* Enable data cache, so if we don't use SPIRAM, it just works.
*/
esp_config_data_cache_mode();
esp_rom_Cache_Enable_DCache(0);
esp_reset_reason_init();
esp_timer_early_init();
esp_flash_config();
esp_intr_initialize();
#if CONFIG_ESP_SPIRAM
esp_init_psram();
/* Init Shared Multi Heap for PSRAM */
int err = esp_psram_smh_init();
if (err) {
printk("Failed to initialize PSRAM shared multi heap (%d)\n", err);
}
#endif
/* Start Zephyr */
z_prep_c();
CODE_UNREACHABLE;
}
void IRAM_ATTR __esp_platform_mcuboot_start(void)
{
esp_intr_initialize();
/* Start Zephyr */
z_prep_c();
CODE_UNREACHABLE;
}
/* Boot-time static default printk handler, possibly to be overridden later. */
int IRAM_ATTR arch_printk_char_out(int c)
{
if (c == '\n') {
esp_rom_uart_tx_one_char('\r');
}
esp_rom_uart_tx_one_char(c);
return 0;
}
void sys_arch_reboot(int type)
{
esp_restart_noos();
}