STM32 MPU OpenSTLinux release note - v4.1.0

Applicable for STM32MP13x lines, STM32MP15x lines

This article describes the content of OpenSTLinux distribution software release version openstlinux-5.15-yocto-kirkstone-mp1-v22.11.23, which is part of the STM32 MPU ecosystem release note - v4.1.0.

1 Intended audience[edit]

The targeted audience is STM32MP13x lines Warning.png and STM32MP15x lines More info.png customers or partners.

2 Delivery scope and purpose[edit]

The OpenSTLinux distribution is a Linux® distribution based on the OpenEmbedded build Framework. It runs on the Arm® Cortex®-A7 processors, and is a fundamental part of the STM32MPU Embedded Software distribution. This delivery of OpenSTLinux distribution is part of STM32 MPU Ecosystem v4.1.0 (see the STM32 MPU ecosystem release note - v4.1.0).

3 Licensing[edit]

This software package is licensed under a LIMITED LICENSE AGREEMENT FOR ST MATERIALS EVALUATION (LLA). Customers may not use this package except in compliance with the software license agreement (SLA).

All packages use the same source components. All components and their respective licenses are listed here.

4 Supported hardware[edit]

This software delivery is compatible with the following boards:

  • STM32MP135F-DK Warning.png Discovery kit of STM32MP13x lines Warning.png.
  • STM32MP157A-EV1 Warning.png, STM32MP157C-EV1 Warning.png, STM32MP157D-EV1 More info green.png and STM32MP157F-EV1 More info green.png Evaluation boards of STM32MP15x lines More info.png.
  • STM32MP157A-DK1 Warning.png, STM32MP157C-DK2 Warning.png, STM32MP157D-DK1 More info green.png and STM32MP157F-DK2 More info green.png Discovery kits of STM32MP15x lines More info.png.

5 Delivered features[edit]

5.1 Main software components[edit]

  • Linux kernel v5.15-stm32mp-r2 (v5.15.67) - Updated
  • TF-A v2.6-stm32mp-r2 - Updated
  • U-Boot v2021.10-stm32mp-r2 - Updated
  • OP-TEE 3.16.0-stm32mp-r2 - Updated
  • STM32CubeMP1 Package v1.6.0
  • OpenEmbedded v4.0.4 (Kirkstone) - Updated
  • Weston version v10.0.2 - Updated
  • Wayland version 1.20.0
  • GStreamer version v1.20.3 - Updated
  • GCC version v11.3.0 - Updated
  • OpenOCD version v0.11.0
  • GCnano version v6.4.9 - Updated

5.2 Detailed features[edit]

5.2.1 OpenSTLinux layers[edit]

  • Rebase on Yocto LTS Release 4.0.4 (Kirkstone)
  • Add support of Firmware Update feature for NAND memory
  • Add Arm® Cortex®-A7 and Arm® Cortex®-M4 examples in Starter Package for STM32MP157D-DK1 More info green.png
  • Move Arm® Cortex®-A7 and Arm® Cortex®-M4 examples from STM32MP157C-DK2 Warning.png to STM32MP157F-DK2 More info green.png
  • Increase default rootfs ext4 partition size: 3GB for eMMC and 4GB for Micro SD Card
  • Minor fixes
Info white.png Information
From prevous major release OpenSTLinux v4.0.0, FIP configuration is the only packaging format supported for boot loaders (more about FIP here) :
  • Only TF-A BL2 requires the stm32 header for a ROM code authentication. Others bootloader binaries are embedded in a FIP container.
  • A dedicated fip-utils-stm32mp.bbclass class is provided on meta-st-stm32mp layer side to manage the FIP image configuration, build and update.

5.2.2 Linux® kernel[edit]

New component release tag 5.15-stm32mp-r2 is available, rebased on official Linux® kernel v5.15.67.

Main updates are:

  • Kernel drivers Real Time ready,
  • SPI slave support in Linux,
  • ADC oversampling support on Linux,
  • SPI master driver with dual-qspi mode in Linux Kernel support,
  • DMA support for CRYP IP (Crypto perf improvement),
  • Minor fixes.

5.2.3 U-boot[edit]

New component release tag 2021.10-stm32mp-r2 is available, rebased on official U-Boot v2021.10.

Main updates are:

  • Fix support of STM32MP13x Rev.Y,
  • Device tree alignment with Linux Kernel v5.15-stm32mp-r2,
  • Remove tests on CONFIG_DM_REGULATOR,
  • Fix invalid clock name references in SCMI driver,
  • Make usage of clock/reset bulk() API in USB EHCI driver,
  • Fix the display of protected GPIO in gpio and pinmux command,
  • Display label for gpio in alternate mode in gpio status command,
  • Fixes for stm32prog command:
  • Correctly handle OTP when SMC is not supported,
  • Support empty flashlayout,
  • Several fixes for STM32MP13 clock,
  • Use correct compatible string to add MTD partitions int ft_board_setup(),
  • Check fdtcontroladdr in label_boot for pxe command parsing, used on extlinux.conf for GENERIC DISTRO support,
  • Use RGB565 for BMP blitting, as panel configuration,
  • Several STM32 I2C corrections,
  • Other minor updates.
Info white.png Information
The U-Boot defconfig to use for ecosystem release ≥ v4.0.0 More info.png changed to stm32mp15_defconfig.
Warning white.png Warning
SPL and STM32Image is not supported anymore in OpenSTLinux U-Boot. Migrate to TF-A with FIP support instead.

5.2.4 TF-A[edit]

New component release tag 2.6-stm32mp-r2 is available, rebased on official TF-A 2.6.

Main updates:

  • Firmware update on NAND devices
  • Improve FIP management on NAND devices
  • Add GPIO regulators driver
  • Allow support of non-paged OP-TEE
  • Use FCONF to manage the Chain of Trust
  • Skip boot devices initialization when returning from Standby (only with OP-TEE)
  • Minor fixes

5.2.5 OP-TEE[edit]

New component release tag 3.16.0-stm32mp-r2 is available, rebased on official OP_TEE OS 3.16.0.

Main updates are:

  • ADC driver implementation
  • IRQ forwarding
  • HUK implementation
  • Update regulator IO management
  • Minor Fixes

6 Release change notification[edit]

OpenSTLinux attention points to switch from ecosystem release v4.0.0 More info.png to ecosystem release v4.1.0 More info.png are documented in STM32 MPU OpenSTLinux release changes notification – v4.1.0 article.

7 Recommendations for use[edit]

7.1 Safe use[edit]

  • Flash programming and boot from all supported flash devices: SDCard, eMMC, ONFI NAND and NOR flash memories.
  • Develop Linux® applications, libraries, kernel modules based on OpenSTLinux delivery.
  • Develop coprocessor Cube applications based on STM32CubeMP1 delivery.
  • Develop boards based on STM32MP1 Series.
  • Prototype applications based on ST boards.

7.2 Non-recommended use[edit]

  • None

8 Main restrictions list[edit]

  • If Firmware Update is not enabled, and the flashlayout partition is not needed anymore, but the storage mapping is hardcoded in U-Boot; either the flashlayout keeps the partitions for Firmware Update feature or U-Boot needs to be updated.
Warning white.png Warning
On an Ubuntu 18.04 (with a host gcc version prior to 8.0), U-Boot cannot be built by using the STM32MP1_Developer_Package because the option : -fmacro-prefix-map , used in U-Boot is not supported by Ubuntu 18.04

9 Minor release updates[edit]

STMicroelectronics regularly delivers corrections through github® components which are U-Boot, OP-TEE, TF-A, Linux kernel.
The corrections can be incorporated into the Developer Package (refer to STM32MP1 Developer Package) or Distribution Package (see below).

Two possibilities exist to update a Distribution Package:

  • Update your existing Distribution Package:
Switch your Distribution Package to # github® mode .
  1. Use the devtool modify <recipe name> command to set up an environment. It fetches and unpacks the source code.
  2. In the extracted source code, use a git command such as git checkout -b WORK <github® TAG> to point to a new revision of the component.
More rarely STMicroelectronics also delivers fixes on layers through github®. These changes can be integrated (via git commands: git checkout -b WORK <github® commit SHA1>) into the local STM32MP1 Distribution Package environment. See below the github® links of the quoted layers :
  • Get a new Distribution Package:
Refer to Installing_the_OpenSTLinux_distribution page for install instructions, and use the repo command given for the minor version below, if it exists.

10 How to get started with openstlinux-5.15-yocto-kirkstone-mp1-v22.11.23[edit]

Refer to How to download the software and start with this release?

11 Associated tools[edit]

Refer to the Referenced tools release notes .

12 Yocto features enabled in the delivery[edit]

OpenEmbedded[1] build framework engine is named OE-Core.
OpenSTLinux distribution is based on the build framework OpenEmbedded, and can be configured thanks to a mechanism named "features" (machine features, distribution features, ...).

Depending on the features enabled, the resulting distribution can have more capabilities or software embedded.
For example, if the wifi is enabled then the wifi software and drivers are present on the filesystem and the wifi can be used.

12.1 Machine features[edit]

The variable MACHINE_FEATURES specifies the list of hardware features the machine is capable of supporting.
These features (MACHINE_FEATURES) are defined inside the machine configuration .

Machine feature Purpose
alsa Include ALSA support (OSS compatibility kernel modules installed if available).
autoresize Add support of autoresize through InitRD
bluetooth Add Broadcom43430 (Bluetooth) firmware to the filesystem
(STM32MP135x-DK Discovery kit Warning.png and STM32MP157x-DKx Discovery kit More info green.png)
ext2 Add Second Extended File System support
fip Enable Firmware In Package (FIP) packaging format
fw-update Enable Firmware update feature
gpu Add GPU support (if EULA is accepted) (STM32MP157 line More info.png only)
initrd Enable Intial ramdisk building
m4copro Add m4projects to userfs (STM32MP15x lines More info.png only)
optee Add OP-TEE Secure part
pci Add Peripheral Component Interconnect peripheral support
rtc Add Real Time Clock peripheral support
screen Add display screen peripheral support
splashscreen Add splashscreen to U-Boot
tpm2 Add Trusted Platform Module peripheral support
usbg0 Add G0 Firmware for USB support
usbgadget Enable USB Gadget feature
usbhost Enable USB Host feature
watchdog Add watchdog support and binaries
wifi Add Broadcom43430 (wifi) firmware to the filesystem
(STM32MP135x-DK Discovery kit Warning.png and STM32MP157x-DKx Discovery kit More info green.png)

12.2 Distribution features[edit]

The variable DISTRO_FEATURES specifies the list of software features present in the distribution.
These features (DISTRO_FEATURES) are defined inside the distribution configuration .

Distribution feature Purpose
alsa Include ALSA support (OSS compatibility kernel modules installed if available).
autoresize Add support of userfs auto resize feature in OpenSTLinux
bluetooth Include Bluetooth support
bluez5 Add Bluetooth stack
efi Add userland EFI tools
ext2 Add Second Extended File System support
ext4 Add Fourth Extended File System support
gobject-introspection-data Enable GObject Introspection, project for providing machine readable introspection data of the API of C libraries.
gplv3 Add gplv3 binaries in OpenSTLinux
gstreamer Add gstreamer tools in filesystem
initrd Add ramdisk
ipv4 Add ipv4 support
ipv6 Add ipv6 support
kde Add several tools (e.g. cups, fontconfig, ...) to the filesystem
largefile Enable large file support
ldconfig Include support for ldconfig and on the target
multiarch Enable 64 bits BFD (Binary File Descriptor)
nfs Include NFS client support (for mounting NFS exports on device).
opengl Include the Open Graphics Library
optee Install tee service on the filesystem
pam Enable Pluggable Authentication Module
pci Add pci support
polkit Enable PolicyKit for controlling system-wide privileges
pulseaudio Network-capable sound server program
splashscreen Add U-Boot splashscreen
systemd Use systemd as init service
usbgadget USB Gadget Device support (for USB networking/serial/storage)
usbhost USB Host support (allows to connect external keyboard, mouse, storage, network etc)
wayland Add Wayland support
wifi WiFi support
xattr Add "Extended Attributes" support for filesystem
zeroconf Add zeroconf package to set up a ad-hoc network

12.3 Bootscheme labels[edit]

The variable BOOTSCHEME_LABELS defines which kind of boot is supported on the board.
These settings (BOOTSCHEME_LABELS) are defined inside the machine configuration .

Bootscheme label Purpose
optee Add optee in bootscheme
trusted Add trusted in bootscheme

12.4 Bootdevice labels[edit]

The variable BOOTDEVICE_LABELS defines which kind of mass storage OpenSTLinux can programmed.
These settings (BOOTDEVICE_LABELS ) are defined inside the machine configuration .

Bootdevice label Purpose
emmc Add boot on emmc device
nand-4-256 Add boot on NAND device
nor-sdcard Add boot stage on NOR device and the filesystem on SD-Card
sdcard Add boot on SD-Card