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.. _zephyr_2.4:

Zephyr 2.4.0 (Working Draft)
############################

We are pleased to announce the release of Zephyr RTOS version 2.4.0.

Major enhancements with this release include:

* Moved to using C99 integer types and deprecate Zephyr integer types.  The
  Zephyr types can be enabled by Kconfig DEPRECATED_ZEPHYR_INT_TYPES option.

The following sections provide detailed lists of changes by component.

Security Vulnerability Related
******************************

The following CVEs are addressed by this release:


More detailed information can be found in:
https://docs.zephyrproject.org/latest/security/vulnerabilities.html

Known issues
************

You can check all currently known issues by listing them using the GitHub
interface and listing all issues with the `bug label
<https://github.com/zephyrproject-rtos/zephyr/issues?q=is%3Aissue+is%3Aopen+label%3Abug>`_.


API Changes
***********

* Moved to using C99 integer types and deprecate Zephyr integer types.  The
  Zephyr types can be enabled by Kconfig DEPRECATED_ZEPHYR_INT_TYPES option.

* The ``<sys/util.h>`` header has been promoted to a documented API with
  :ref:`experimental stability <api_lifecycle>`. See :ref:`util_api` for an API
  reference.

* The :c:func:`wdt_feed` function will now return ``-EAGAIN`` if
  issuing a feed would stall the caller.  Application code may need to
  ignore this diagnostic result or initiate another feed operation
  later.

Deprecated in this release
==========================


Removed APIs in this release
============================

* Other

  * The deprecated ``MACRO_MAP`` macro has been removed from the
    :ref:`util_api`. Use ``FOR_EACH`` instead.

Stable API changes in this release
==================================


Kernel
******


Architectures
*************

* ARC:


* ARM:

  * Interrupt vector relaying feature support is extended to Cortex-M Mainline
    architecture variants


* POSIX:


* RISC-V:


* x86:


Boards & SoC Support
********************

* Added support for these SoC series:


* Added support for these ARM boards:


* Made these changes in other boards


* Added support for these following shields:


Drivers and Sensors
*******************

* ADC


* Audio


* Bluetooth


* CAN


* Clock Control


* Console


* Counter


* Crypto


* DAC


* Debug


* Display


* DMA


* EEPROM


* Entropy


* ESPI


* Ethernet


* Flash


* GPIO


* Hardware Info


* I2C


* I2S


* IEEE 802.15.4


* Interrupt Controller


* IPM


* Keyboard Scan


* LED


* LED Strip


* LoRa


* Modem


* PECI


* Pinmux


* PS/2


* PWM


* Sensor


* Serial


* SPI


* Timer


* USB


* Video


* Watchdog


* WiFi



Networking
**********


Bluetooth
*********

* Host:


* BLE split software Controller:

* HCI Driver:

  * bt_hci_evt_is_prio() removed, use bt_hci_evt_get_flags() instead when
    CONFIG_BT_RECV_IS_RX_THREAD is defined and call bt_recv and bt_recv_prio
    when their flag is set, otherwise always call bt_recv().

Build and Infrastructure
************************

* Devicetree

Libraries / Subsystems
**********************

* Disk


* Random


* POSIX subsystem:


* Power management:


HALs
****

* HALs are now moved out of the main tree as external modules and reside in
  their own standalone repositories.

Documentation
*************


Tests and Samples
*****************


Issue Related Items
*******************

These GitHub issues were addressed since the previous 2.3.0 tagged
release: