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QNX Software Development Platform
QNX SDP is a cross-compiling and debugging environment, including an IDE and command-line tools, for building binary images and programs for target boards running the QNX OS 8.0.
OS Components & Operations
PCI Server User's Guide
PCI multiplexer
Multiplexer API Reference

QNX Momentics IDE User's Guide
This User's Guide describes version 8.0 of the Integrated Development Environment (IDE) that's part of the QNX Tool Suite.
QNX Software Development Platform
QNX SDP is a cross-compiling and debugging environment, including an IDE and command-line tools, for building binary images and programs for target boards running the QNX OS 8.0.
- Quickstart Guide
- System Architecture
  The System Architecture guide accompanies the QNX OS and is intended for both application developers and end-users.
- OS Components & Operations
  - Boot Optimization Guide
    The Boot Optimization Guide describes techniques you can use to reduce the time from your board's initial power on until you have a fully functional QNX system running on the board.
  - Building Embedded Systems
    The Building Embedded Systems guide is intended for developers who are developing or building BSPs for QNX OS embedded systems.
  - Customizing a BSP
    While QNX provides Board Support Packages (BSPs) for many common platforms and their individual variants, in some cases, you need a BSP for a board that QNX does not provide. If this is the case, you can modify a QNX BSP or develop your own.
  - Device Publishers Developer's Guide
  - High Availability Framework Developer's Guide
  - High-Performance Networking Stack (io-sock) User's Guide
    This guide contains instructions for implementing and using the QNX OS High-Performance Networking Stack and its manager, io-sock.
  - PCI Server User's Guide
    - PCI Server Overview
      The PCI server manages the hierarchy of PCI devices attached to a system.
    - PCI Hierarchy: Partitioning and Segmentation
      Partitioning and segmentation provide flexibility in using the PCI subsystem, and specifically the pci-server. It provides the ability to achieve:
    - Design Details
    - PCI multiplexer
      - Command line for PCI connector (pci-connector)
        Connect PCI multiplexer APIs to the PCI server
      - Multiplexer API Reference
        build_mux_command_device_read_ba()
        Build a command to perform base address register read requests
        build_mux_command_device_read_irq()
        Build a command to read interrupt requests
        pci_mux_command()
        Send a command to the PCI connector or multiplexer
        pci_mux_connect(), pci_mux_direct_connect()
        Open a connection and send a connection message
        pci_mux_disconnect()
        Ends a connection
        pci_mux_fini()
        Clean a connection
        pci_mux_init()
        Initiate and allocate connection structure
        pci_mux_version()
        Get the PCI version
      - Multiplexer example
        This example illustrates how to use the PCI multiplexer APIs.
    - API Reference
    - Capability Modules and APIs
      This appendix describes some general-purpose capability modules and their APIs.
  - Performance Tuning User's Guide
  - QNX Filesystem for Safety User's Guide
  - SMMUMAN User's Guide
  - System Analysis Toolkit (SAT) User's Guide
  - Technotes
  - User's Guide
    The QNX OS User's Guide is intended for all users of a QNX OS system, from system administrators to end users.
- Graphics
- Programming
- System Security Guide
  The QNX System Security Guide is intended for both system integrators who are responsible for the security of a QNX OS system and developers who want to create a QNX OS resource manager free from vulnerabilities.
- Utilities & Libraries
- Migrating to QNX OS 8.0
QNX Software in the Cloud
QNX Software in the Cloud enables developers to use the QNX software in Amazon Web Services (AWS) and Microsoft Azure (Azure).
QNX Toolkit for Visual Studio Code
This User's Guide describes the QNX^® Toolkit for Visual Studio Code. The guide introduces you to the QNX Toolkit by explaining the QNX development environment and how to build, run, and debug your QNX^® Operating System (OS) applications and systems.
QNX Hypervisor and QNX Hypervisor for Safety
The QNX Hypervisor and QNX Hypervisor for Safety products allow you to run multiple OSs on a target system so you can separate critical and non-critical functions, support a wide variety of applications, and reduce hardware costs.
Typographical Conventions, Support, and Licensing
This section describes the typographical conventions used throughout the documentation, explains how to obtain technical support, and provides some information about licensing.

Multiplexer API Reference

QNX SDP8.0PCI Server User's GuideAPIConfiguration

This chapter describes the PCI mulitplexer functions.

Page updated: March 25, 2026