Zephyr 4.1.0 (Working Draft)

We are pleased to announce the release of Zephyr version 4.1.0.

Major enhancements with this release include:

An overview of the changes required or recommended when migrating your application from Zephyr v4.0.0 to Zephyr v4.1.0 can be found in the separate migration guide.

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

API Changes

Removed APIs in this release

• The deprecated Bluetooth HCI driver API has been removed. It has been replaced by a Bluetooth HCI APIs that follows the normal Zephyr driver model.

• The deprecated CAN_MAX_STD_ID (replaced by CAN_STD_ID_MASK) and CAN_MAX_EXT_ID (replaced by CAN_EXT_ID_MASK) CAN API macros have been removed.

• The deprecated can_get_min_bitrate() (replaced by can_get_bitrate_min()) and can_get_max_bitrate() (replaced by can_get_bitrate_max()) CAN API functions have been removed.

• The deprecated can_calc_prescaler() CAN API function has been removed.

Deprecated in this release

• Deprecated the bt_le_set_auto_conn() API function. Application developers can achieve the same functionality in their application code by reconnecting to the peer when the bt_conn_cb.disconnected callback is invoked.

• Deprecated TinyCrypt library. The reasons for this are (GitHub #43712):

  • The upstream version of this library is no longer maintained.

  • Reducing the number of cryptographic libraries in Zephyr to reduce maintenance overhead.

  • The PSA Crypto API is the recommended cryptographic library for Zephyr.

Architectures

• Common

  • Introduced CONFIG_ARCH_HAS_CUSTOM_CURRENT_IMPL, which can be selected when an architecture implemented and enabled its own arch_current_thread() and arch_current_thread_set() functions for faster retrieval of the current CPU’s thread pointer. When enabled, _current variable will be routed to the arch_current_thread() (GitHub #80716).

• ARC

• ARM

• ARM64

• RISC-V

  • Implements arch_current_thread_set() & arch_current_thread(), which can be enabled by CONFIG_RISCV_CURRENT_VIA_GP (GitHub #80716).

• Xtensa

• native/POSIX

  • CONFIG_NATIVE_APPLICATION has been deprecated.

  • For the native_sim target CONFIG_NATIVE_SIM_NATIVE_POSIX_COMPAT has been switched to n by default, and this option has been deprecated.

Kernel

Bluetooth

• Audio

• Host

  • CONFIG_BT_BUF_ACL_RX_COUNT has been deprecated and CONFIG_BT_BUF_ACL_RX_COUNT_EXTRA has been added.

• HCI Drivers

• Mesh

  • Introduced a bt_mesh_health_cli::update callback which is used to update the message published periodically.

Boards & SoC Support

• Added support for these SoC series:

• Made these changes in other SoC series:

• Added support for these boards:

• Made these board changes:

  • All HWMv1 board name aliases which were added as deprecated in v3.7 are now removed (GitHub #82247).

  • mimxrt1050_evk and mimxrt1060_evk revisions for qspi and hyperflash have been converted into variants. mimxrt1060_evkb has been converted into revision B of mimxrt1060_evk.

  • Enabled USB, RTC on NXP frdm_mcxn236

• Added support for the following shields:

Build system and Infrastructure

• Space-separated lists support has been removed from Twister configuration files. This feature was deprecated a long time ago. Projects that do still use them can use the scripts/utils/twister_to_list.py script to automatically migrate Twister configuration files.

• Twister

  • Test Case names for Ztest now include Ztest suite name, so the resulting identifier has three sections and looks like: <test_scenario_name>.<ztest_suite_name>.<ztest_name>. These extended identifiers are used in log output, twister.json and testplan.json, as well as for --sub-test command line parameters (GitHub #80088).

  • The --no-detailed-test-id command line option also shortens Ztest Test Case names excluding its Test Scenario name prefix which is the same as the parent Test Suite id (GitHub #82302). Twister XML reports have full testsuite name as testcase.classname property resolving possible duplicate testcase elements in twister_report.xml testsuite container.

Drivers and Sensors

• ADC

• Battery

• CAN

• Charger

• Clock control

• Counter

• DAC

• Disk

• Display

  • Added flag frame_incomplete to display_write that indicates whether a write is the last write of the frame, allowing display drivers to implement double buffering / tearing enable signal handling (GitHub #81250)

  • Added frame_incomplete handling to SDL display driver (zephyr,sdl-dc) (GitHub #81250)

  • Added transparency support to SDL display driver (zephyr,sdl-dc) (GitHub #81184)

• Ethernet

• Flash

  • NXP MCUX FlexSPI: Add support for 4-byte addressing mode of Micron MT25Q flash family (GitHub #82532)

• FPGA

  • Extracted from lattice,ice40-fpga the compatible and driver for lattice,ice40-fpga-bitbang. This replaces the original load_mode property from the binding, which selected either the SPI or GPIO bitbang load mode.

• GNSS

• GPIO

• Hardware info

• I2C

• I2S

• I3C

• Input

• LED

  • Added a new set of devicetree based LED APIs, see led_dt_spec.

  • lp5569: added use of auto-increment functionality.

  • lp5569: implemented write_channels api.

  • lp5569: demonstrate led_write_channels in the sample.

• LED Strip

• LoRa

• Mailbox

• MDIO

• MFD

• Modem

• MIPI-DBI

• MSPI

• Pin control

  • Added new driver for Silabs Series 2 (silabs,dbus-pinctrl).

• PWM

• Regulators

• Reset

• RTC

• RTIO

• SDHC

• Sensors

• Serial

• SPI

• Stepper

  • Added driver for ADI TMC2209. adi,tmc2209.

  • Added driver for TI DRV8424. ti,drv8424.

  • Added CONFIG_STEP_DIR_STEPPER to enable common functions for step/dir steppers.

• USB

• Video

  • Changed include/zephyr/drivers/video-controls.h to have control IDs (CIDs) matching those present in the Linux kernel.

• Watchdog

• Wi-Fi

Networking

• ARP:

• CoAP:

• Connection manager:

• DHCPv4:

• DHCPv6:

• DNS/mDNS/LLMNR:

• gPTP/PTP:

• HTTP:

• IPSP:

• IPv4:

• IPv6:

• LwM2M:

• Misc:

• MQTT:

• Network Interface:

• OpenThread:

  • Removed the implicit enabling of the CONFIG_NVS Kconfig option by the CONFIG_NET_L2_OPENTHREAD symbol.

• PPP

• Shell:

• Sockets:

  • The deprecated CONFIG_NET_SOCKETS_POSIX_NAMES option has been removed. It was a legacy option and was used to allow user to call BSD socket API while not enabling POSIX API. This removal means that in order to use POSIX API socket calls, one needs to enable the CONFIG_POSIX_API option. If the application does not want or is not able to enable that option, then the socket API calls need to be prefixed by a zsock_ string.

• Syslog:

• TCP:

• Websocket:

• Wi-Fi:

  • hostap: Removed the unused default Crypto module CONFIG_WIFI_NM_WPA_SUPPLICANT_CRYPTO Kconfig option.

• zperf:

USB

Devicetree

• Added DT_ANY_INST_HAS_BOOL_STATUS_OKAY.

Kconfig

Libraries / Subsystems

• Debug

• Demand Paging

• Formatted output

• Management

• Logging

• Modem modules

• Power management

• Crypto

  • The Kconfig symbol CONFIG_MBEDTLS_PSA_STATIC_KEY_SLOTS was added to allow Mbed TLS to use statically allocated buffers to store key material in its PSA Crypto core instead of heap-allocated ones. This can help reduce (or remove, if no other component makes use of it) heap memory requirements from the final application.

  • The Kconfig symbol CONFIG_MBEDTLS_PSA_KEY_SLOT_COUNT was added to allow selecting the number of key slots available in the Mbed TLS implementation of the PSA Crypto core. It defaults to 16. Since each slot consumes RAM memory even if unused, this value can be tweaked in order to minimize RAM usage.

• CMSIS-NN

• FPGA

• Random

• SD

• State Machine Framework

• Storage

• Task Watchdog

• POSIX API

• LoRa/LoRaWAN

• ZBus

HALs

• Nordic

• STM32

• ADI

• Espressif

MCUboot

OSDP

Trusted Firmware-M

LVGL

• Added frame_incomplete support to indicate whether a write is the last write of the frame (GitHub #81250)

Tests and Samples

• Fixed incorrect alpha values in samples/drivers/display. (GitHub #81184)

• Added samples/modules/lvgl/screen_transparency. (GitHub #81184)

Issue Related Items

Known Issues