Next OSADL Events:
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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
2010-02-09 12:00
Spinlock annotations merged from the realtime tree to Linux mainline in 2.6.33
Raw spinlocks are the "real" spinlocks now
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 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 |
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Deterministic Scheduler |
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Preemption Support |
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PI Mutexes | |
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High-Resolution Timer |
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Preemptive Read-Copy Update |
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IRQ Threads |
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Raw Spinlock Annotation |
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Full Realtime Preemption Support |
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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
- The Linux Kernel: Linux Vanilla Kernel
- The Real Time Preempt Patch: RT Preempt Download Page at kernel.org
"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 
here.
HOWTO
A more detailed description how to equip the Linux kernel wth realtime capabilities is given here.