Enabling Vc4Graphics and v4l2 on RPI for Thunder builds

• Introduction
• Environment Setup
  • Set-up Considerations
  • User Access Considerations
  • Accessing the System
  • System Work Flow
  • Exiting the System
• Executing System
• Troubleshooting
  • Error Messages
  • Special Considerations

This Page is under Development

Introduction

      The Broadcom VideoCore 4 (present in the Raspberry Pi) contains a OpenGL ES 2.0-compatible 3D engine called V3D, and a highly configurable display output pipeline that supports HDMI, DSI, DPI, and Composite TV output. The 3D engine also has an interface for submitting arbitrary compute shader-style jobs using the same shader processor as is used for vertex and fragment shaders in GLES 2.0. Closed source graphics stack runs on VC4 GPU and talks to V3D and display component. Vc4 uses mesa instead of userland for graphics. Mesa is an open source software implementation of OpenGl, Vulkan and other graphics API specification. Mesa translates these specifications to vendor specific graphics hardware drivers.

Current RDK CMF RPI Structure 

  Current RPI structure uses userland to send OpenGL commands to GPU/VPU through VCHIQ.     

Environment Setup

• Set-up Considerations

<Briefly describe and graphically depict as appropriate the equipment, communications, and network configuration of the system in a way that a non-technical user can understand>

• User Access Considerations

<Briefly describe and graphically depict as appropriate the equipment, communications, and network configuration of the system in a way that a non-technical user can understand>

• Accessing the System

<Provide detailed information and describe the procedures necessary to access the system. If applicable, include how to get a user ID and log on to the system, as well as the actions a user must take to change and/or reset a password.>

• System Work Flow

<Describe how system flow is happening mentioning checkpoints which can be verified during flow to ensure system is working as expected>

Executing System

Describe the specific system function or feature in detail and depict graphically by including screen prints and descriptive narrative as appropriate. Ensure each screen print is captioned and has an associated tag providing appropriate alternative text

Follow the above for sub feature / use cases

Troubleshooting

• Error Messages

<Identify the error messages that a user may receive and the likely cause(s) and/or possible corrective actions for the error>

• Special Considerations

<If applicable, describe any special circumstances, actions, exceptions, etc., that should be considered for troubleshooting.>