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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
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.
Optimizing the Platform Application Stack
This chapter present optimization techniques you can apply in the bootup sequence at, and after, the boot script.
Reorder the startup program
A microkernel OS allows you to reorder some of your startup program.

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.
    - About the System Startup Sequence
      The boot process consists of several tasks, each handled by a specialized component.
    - Optimizing the Loading and Launching of the OS
      This chapter presents optimization techniques you can apply in the bootup sequence that precedes the boot script.
    - Optimizing the Platform Application Stack
      This chapter present optimization techniques you can apply in the bootup sequence at, and after, the boot script.
      - Reorder the startup program
        A microkernel OS allows you to reorder some of your startup program.
      - Make careful use of the default boot script
        The script section in the buildfile we provide normally has many components commented out so that you build a minimal system.
      - Consider the placement of waitfor statements
        The waitfor statements in the boot script aren't grouped for optimal performance.
    - Measuring Boot Times
      Before applying any of the techniques described here, always remember to get a stable baseline measurement of system boot speed.
    - Optimizing Screen Startup Times
      This chapter describes strategies and techniques that you can use to reduce the time between when you power on and when Screen is ready on your system.
  - 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
  - Performance Tuning 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 OS in the Amazon cloud environment.
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 User's Guide
This User's Guide explains the QNX hypervisor architecture and provides instructions for installing and running a QNX Hypervisor system, changing system components and configuration, and using hypervisor features such as virtual devices (vdevs).
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.

Reorder the startup program

QNX SDP8.0Boot Optimization GuideDeveloper

A microkernel OS allows you to reorder some of your startup program.

If you're used to working with a monolithic kernel like Linux or Windows, you might be inclined to start all your drivers before you start any applications. With a microkernel OS, however, you have more flexibility and can reorder some of your startup program to take advantage of any idle time. This includes starting applications before starting drivers, wherever it makes sense. In addition, you can use SLM to manage utilities and services that can be started later or as needed.

Page updated: March 05, 2025