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Realtime
While developing a Linux based Embedded Processing system, the question often comes up if real time behavior is necessary and if yes, how Linux behaves regarding this. This page will collect infos and resources regarding Linux and real time, most of them not-device specific, some are.
Contents
Linux real time resources[edit]
- Real-Time Linux Wiki
- Real-time Linux Software Quick Reference Guide
- SMP and Embedded Real Time
- Real time in embedded Linux systems presentation from Free Electrons
Real-time solutions for Linux[edit]
Over time several solutions have been developed to improve the real-time behavior of Linux. While each one has certain pros and cons (probably depending on the application scenario) there are only a few that are still in active development and have reached a critical mass. RT-preemption patch, Xenomai and RTAI are some of the well known efforts while currently only the first one is making major efforts to get integrated into the mainline kernel. For details about RT-preemption patch development and status it is recommended to visit the RT Wiki and/or follow the developer list (rtlist-at-vger).
The RT-preemption patch development is an active project of the OSADL organization (Open Source in Automation Development Lab). This organization is hosting a farm of processor boards with different architectures from different vendors on their web. All of the boards run a kernel with Linux and the RT-preemption patch. The resulting test data may be viewed online in tables and plots.
RT Linux on AM3517[edit]
As an example for a Cortex-A8 architecture a TI AM3517 EVM running 2.6.33.7-rt29 can be seen on the OSADL web.
-rt on DaVinci[edit]
Patches[edit]
With recent ARM Linux git DaVinci kernel (2.6.23-davinci1 as of writing this article) -rt patch patch-2.6.23-rt1.bz2 applies cleanly. Thanks to Kevin Hilman (ignore back port discussion there, it is outdated) all necessary preparation in DaVinci tree is already done.
Note: If you like to use patch-2.6.23-rt1, you need one additional patch:
Configuration[edit]
If -rt patch is applied, configure your kernel and additionally select
Real-Time Preemption mode in Kernel features sub menu (should be enabled by default if -rt is applied).
Then you can go on as you do with a "normal" kernel and build it.
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