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1 What is the OpenSTLinux distribution?
The OpenSTLinux distribution, running on the Arm® Cortex®-A processor(s), is a sub-part of the STM32MPU Embedded Software distribution.
OpenSTLinux is a Linux® distribution based on the OpenEmbedded build framework.
It includes the following collection of software components:
- OpenSTLinux BSP (OP-TEE secure OS, boot chain and Linux kernel)
- Application frameworks such as the following Linux application frameworks (non-exhaustive list):
As explained in the OpenEmbedded article, the files used to build an image are stored in layers that come from different sources, and that are configured for this image.
Only layers specific to the OpenSTLinux distribution (for example the OpenSTLinux Board Support Package layer) are detailed in the Layers chapter below. Community layers referenced in this article are not listed.
The Machines chapter introduces the machine metadata (the information needed to build a kernel for specific target boards), while the Images chapter specifies the images that contain the information needed to build the user space. The Distros chapter describes the available distros configurations.
2 Software architecture overview
The figure below gives an overview of the OpenSTLinux architecture. You can obtain more details by clicking on one of the sub-levels.
The Linux application frameworks (or Linux user space components) that rely on the OpenSTLinux BSP, mainly come from open-source communities.
OpenEmbedded core components (community layers) combined with STMicroelectronics-specific layers (for example the BSP layer) give a consistent starting point to develop customer applications based on a standardized interface.
3 OpenSTLinux concept
To build an OpenSTLinux based software, a combination of machine, image and distro must be selected.
Available machines, images and distros are listed below.
More information on how to compile and use an OpenSTLinux distribution can be found in the Distribution Package articles.
This chapter describes the layers developed by STMicroelectonics.
STMicroelectronics' strategy is to organize the layers in order to split BSP descriptions from applications and frameworks.
By doing this, any BSP can be combined with any framework, or no framework at all.
|meta-st-stm32mp||BSP Layer for stm32mp|
|meta-st-openstlinux||OpenSTLinux layer - framework/image settings|
For the detailed content of the layers, please check STM32MP15_OpenSTLinux_release_note#Detailed delivery content
In addition, in OpenSTLinux distribution, a layer (meta-st-stm32mp-addons) has been created to manage STM32CubeMX integration.
If necessary, you can also create your own layer. The procedure to do so is explained in How_to_create_a_new_open_embedded_layer.
|meta-st-stm32mp-addons||BSP Layer addons for stm32mp (CubeMX Machine)|
|stm32mp1||Machine configuration for STM32MP1 microprocessor device boards|
|stm32mp1-eval||Machine configuration for STM32MP1 evaluation board|
|stm32mp1-disco||Machine configuration for STM32MP1 disco board|
|st-image-weston||OpenSTLinux weston image with basic Wayland support (if enabled in distro)|
|st-image-core||OpenSTLinux core image|
|Images, proposed as example only|
|st-example-image-qt||ST example of image based on QT framework|
|st-example-image-qtwayland||ST example of image based on QT framework (available for ecosystem release ≥ v2.1.0 )|
For further details on distributions (distros), read "Creating a distribution" 
|openstlinux-eglfs||OpenSTLinux featuring eglfs - no X11, no Wayland|
|openstlinux-weston||OpenSTLinux featuring Weston/Wayland|
|nodistro||*** DEFAULT OPENEMBEDDED SETTING : DISTRO is not defined ***|
3.5 Reference source code
The TF-A, U-Boot, OP-TEE and kernel components have been configured by default to use tarball + patches for source code.
If you prefer to use github® as a source code reference, you need to update your local.conf file
Refer to the section ‘Configure STM32MP default version to github’ in local.conf :
# ========================================================================= # Configure STM32MP default version to github # ========================================================================= #STM32MP_SOURCE_SELECTION_pn-linux-stm32mp = "github" #STM32MP_SOURCE_SELECTION_pn-optee-os-stm32mp = "github" #STM32MP_SOURCE_SELECTION_pn-tf-a-stm32mp = "github" #STM32MP_SOURCE_SELECTION_pn-u-boot-stm32mp = "github"
Then just uncomment the line to switch the component to github® for source code.
4 How to get the software for this distribution
The OpenSTLinux distribution is available through the three Packages (Starter, Developer, and Distribution) of the STM32MPU Embedded Software distribution.