IPC (Inter-Processor Call) component has been moved to ``esp_system``.
Thus, any project presenting a ``CMakeLists.txt`` file with the parameters ``PRIV_REQUIRES esp_ipc`` or ``REQUIRES esp_ipc``, should be modified to simply remove these options as ``esp_system`` component is included by default.
Deprecated ROM related header files from `components/esp32/rom/` (old include path: `rom/*.h`) have been deleted. Please update to use the new target-specific path from `components/esp_rom/include/{IDF_TARGET_NAME}/` (new include path: `{IDF_TARGET_NAME}/rom/*.h`).
- The header files ``soc/cpu.h`` have been deleted and deprecated CPU util functions have been removed. ESP-IDF developers should include ``esp_cpu.h`` instead for equivalent functions.
- The header file ``esp_intr.h`` has been deleted. Please include ``esp_intr_alloc.h`` to allocate and manipulate interrupts.
- The header file ``esp_panic.h`` has been deleted. ESP-IDF developers should include ``esp_private/panic_reason.h`` to get supported panic reasons. And should include ``esp_debug_helpers.h`` to use any debug related helper functions, e.g. print backtrace.
- The header file ``soc_log.h`` is now renamed to ``esp_hw_log.h`` and all logging macros have been updated from ``SOC_LOGx`` to ``ESP_HW_LOGx``. ESP-IDF users must use the later form.
- The header files ``spinlock.h``, ``clk_ctrl_os.h`` and ``rtc_wdt.h`` must now be included without the ``soc`` prefix. Eg:- ``#include "spinlock.h"``.
- The header files ``esp_random.h``, ``esp_mac.h`` and ``esp_chip_info.h``, which were all previously indirectly included via the header file ``esp_system.h``, must now be included directly. These headers are removed from ``esp_system.h``.
- The header file ``eh_frame_parser.h`` must now be included with a ``esp_private`` prefix like ``#include "esp_private/eh_frame_parser.h"``.
- Public API headers who are listed in the Doxyfiles won't expose unstable and unnecessary soc header files like ``soc/soc.h``, ``soc/rtc.h``. That means, the user has to explicitly include them in their code if these "missing" header files are still wanted.
- Kconfig option ``LEGACY_INCLUDE_COMMON_HEADERS`` is also removed.
- The header file ``soc/soc_memory_types.h`` has been deprecated. Users should use the ``esp_memory_utils.h`` instead. Including `soc/soc_memory_types.h` will bring a build warning like `soc_memory_types.h is deprecated, please migrate to esp_memory_utils.h`
One of the timestamp sources has changed from the legacy timer group driver to the new :doc:`GPTimer <../api-reference/peripherals/gptimer>`. Kconfig choices like ``APPTRACE_SV_TS_SOURCE_TIMER00`` has been changed to ``APPTRACE_SV_TS_SOURCE_GPTIMER``. User doesn't need to choose the group and timer ID any more.
Removed the FRC2 based legacy implementation of esp_timer available on ESP32. The simpler and more efficient implementation based on the LAC timer is now the only option.
