Open Source Automation Development Lab
You are here: Home / Projects / 
2010-03-18 - 22:20

Next OSADL Events:

Hannover Fair 2010
19.04 - 23.04

Breaking News:

2010-03-10 12:00

Parallel real-time on multi-core systems with mainline Linux

Several tasks simultaneously running at real-time priority no longer interfere to each other!


2010-02-22 12:00

"Latest Stable" Linux mainline real-time 2.6.31 is out!

Kernel 2.6.31.12-rt21 is our latest and greatest


2010-02-21 12:00

OSADL at the Embedded World 2010

Industry needs Open Source - Open Source meets Industry


2010-02-08 12:00

Prof Eben Moglen on "GNU GPL Version 3: The Law Making Process"

International Conference on Commons, Users, Service Providers Internet (Self-)Regulation and Copyright


2009-11-23 12:00

Added a new HOWTO to the OSADL Website: Use BuildRoot to create a Linux image for QEMU

Guest Editor Bogdan Cristea tells us about rapid prototyping of an embedded system using virtualization



OSADL Projects

OSADL Project: Realtime Linux

Is realtime possible with Linux? Yes, it is. But which Linux derivate should I use? This is the key question to be answered when Linux is going to be used in the automation industry.

The OSADL criteria for realtime Linux are:

  • Strong and agile community
  • Long term availability
  • Ease of use (user space realtime)
  • POSIX API for real time (standard API)
  • Wide architecture support
  • Mainstream support by the Vanilla Kernel

This project supports the evolution of the realtime preempt patch maintained by Ingo Molnar, and Thomas Gleixner. We believe that long term stability can only be achieved when the realtime aspects are as close to the Vanilla Kernel as possible.

Realtime Linux Road Map

This is the current status of Realtime Linux using the Realtime-Preempt patches:

Architecture

x86

x86/64

powerpc

arm

mips

68knommu

Feature

Deterministic Scheduler

Preemption Support

PI Mutexes

3

High-Resolution Timer

1

1

1

1

Preemptive Read-Copy Update

2

2

2

2

2

2

IRQ Threads

4

4

4

4

4

3,4,5

Raw Spinlock Annotation

6

6

6

6

6

6

Full Realtime Preemption Support


3

Available in mainline Linux
Available when Realtime-Preempt patches applied

1) Since kernel 2.6.24 in mainline Linux
2) Since kernel 2.6.25 in mainline Linux
3) Realtime-Preempt patches 2.6.24.7-rt15 or higher required
4) Since kernel 2.6.30 in mainline Linux
5) Not yet adapted to generic interrupt code
6) Since kernel 2.6.33 in mainline Linux

Download Locations of Realtime Linux

"Latest stable" Realtime Linux

Kernel

www.kernel.org/pub/linux/kernel/v2.6/linux-2.6.31.12.tar.bz2

RT-Preempt Patch

www.kernel.org/pub/linux/kernel/projects/rt/patch-2.6.31.12-rt21.bz2

Realtime Linux Installation Instructions

Quick overview

A quick list of the commands needed to download, patch and build an RT-Preempt realtime Linux kernel is given Opens internal link in current windowhere.

HOWTO

A more detailed description how to equip the Linux kernel wth realtime capabilities is given Opens internal link in current windowhere.

Links related to Realtime Linux