GPU internal peripheral

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1. Article purpose[edit source]

The purpose of this article is to:

briefly introduce the GPU peripheral and its main features
indicate the level of security supported by this hardware block
explain how each instance can be allocated to the three runtime contexts and linked to the corresponding software components
explain, when necessary, how to configure the GPU peripheral.

2. Peripheral overview[edit source]

The GPU peripheral is a dedicated graphics processing unit. It accelerates numerous 3D graphics applications such as graphical user interface (GUI), menu display or animations. It works together with an optimized software stack designed for industry-standard APIs and supporting Android^TM and Linux^® embedded development platforms.

2.1. Features[edit source]

Refer to the STM32MP15 reference manuals for the complete list of features, and to the software components, introduced below, to see which features are implemented.

2.2. Security support[edit source]

The GPU is a non-secure peripheral.

3. Peripheral usage and associated software[edit source]

3.1. Boot time[edit source]

The GPU is not used at boot time.

3.2. Runtime[edit source]

3.2.1. Overview[edit source]

The GPU internal peripheral is allocated to the Arm^® Cortex^®-A7 non-secure core running the Linux^® userland.

Chapter Peripheral assignment describes which peripheral instance can be assigned to which context.

3.2.2. Software frameworks[edit source]

Domain	Peripheral	Software components			Comment
Domain	Peripheral	OP-TEE	Linux	STM32Cube	Comment
Visual	GPU		OpenGL®ES framework

3.2.3. Peripheral configuration[edit source]

The configuration is applied by the firmware running in the context to which the peripheral is assigned. The configuration can be done alone via the STM32CubeMX tool for all internal peripherals, and then manually completed (particularly for external peripherals), according to the information given in the corresponding software framework article, and in the GPU device tree configuration article for Linux^®.

3.2.4. Peripheral assignment[edit source]

Internal peripherals

Check boxes illustrate the possible peripheral allocations supported by STM32 MPU Embedded Software:

☐ means that the peripheral can be assigned (☑) to the given runtime context.
✓ is used for system peripherals that cannot be unchecked because they are statically connected in the device.

Refer to How to assign an internal peripheral to a runtime context for more information on how to assign peripherals manually or via STM32CubeMX.
The present chapter describes STMicroelectronics recommendations or choice of implementation. Additional possiblities might be described in STM32MP15 reference manuals.

Domain	Peripheral	Runtime allocation				Comment
Domain	Peripheral	Instance	Cortex-A7 secure (OP-TEE)	Cortex-A7 non-secure (Linux)	Cortex-M4 (STM32Cube)	Comment
Visual	GPU	GPU		☐

4. How to go further[edit source]

Please go through the articles belonging to the GPU category.