About This Guide

Boot optimization describes strategies and techniques that you can use to reduce the bootup time of your QNX Platform for ADAS system. Because the time to boot is dependent upon the design and implementation of your system, this guide describes general techniques instead of concrete steps to optimize your system.

Your QNX Platform for ADAS system, whether or not it has displays and a GPU, relies on the Screen Graphics Subsystem. Screen supports systems with or without displays, and systems with or without a GPU. For these systems, optimization opportunities are mostly in the areas of starting up your base system (IPL, kernel, Core OS) and Screen. This guide describes many different possible optimization techniques. Use the techniques that are applicable to your system.

We recommend that you use this optimization guide together with the techniques and strategies discussed in the Optimizing Startup Times guide of the Screen Graphics Subsystem.

Note: It's important to note that the actual time saved (typically in the order of milliseconds) varies between hardware platforms. As the system architect or developer, you should implement the optimization techniques that meet the requirements for your system.

Some hardware platforms aren't functional until all the necessary device drivers are started. For those platforms, you won't be able to take advantage of all the techniques described in this guide to optimize the startup time. Some of the techniques described in this guide are targeted for hardware platforms that permit you to start device drives as required, rather than requiring that all device drivers be started before any applications can run.

In this document, we refer to:

content as a static image or a video
camera application as the camera application that captures image buffers from camera hardware. It may or may not show content on a display. You should use the optimization techniques that are applicable to your camera application.

We recommend that you review the following guides to have a good understanding of how to design an embedded system to boot quickly and work with multiple images (such as creating a primary and secondary IFS):

Building Embedded Systems Guide
Reloadable Image Filesystems chapter in the QNX Neutrino Technotes
Making Multiple Images chapter in the QNX Neutrino Technotes

Here's what's contained in this guide:

For information on:	Go to:
An overview of the system startup sequence	About The System Startup Sequence
An overview of the areas you can optimize	Optimizing bootup time
A summary of the techniques to split the IFS into a primary and secondary IFS	Configure a Primary and Secondary IFS on the System
A summary of the techniques to optimize the Screen configuration file	Optimize the Screen Configuration File
A summary of techniques to optimize your boot script	Optimize the Boot Script
A summary of the techniques to optimize SLM	Optimize SLM Configuration Files
A summary of techniques and strategies to optimize your camera application	Optimize your Camera Application
A summary of techniques you can use to optimize the boot time of an embedded system	Other System Optimization Practices