我应该选择哪种 Linux RTOS 解决方案?
我正在准备在 Linux 之上构建 RTOS 解决方案,该解决方案将在嵌入式设备上运行。我自己做了一些调查,但仍然有点困惑。 这些是我的标准:
易于在 Samsung s3c2440 ARM9 机器上运行
开源
与 Linux 一起使用
良好的社区支持
我见过 RTLinux 和 Xenomai。 Xenomai 看起来更像是我的东西,但我仍然很困惑。
有什么好的建议、优点和缺点吗?
I'm preparing myself to build RTOS solution on top of Linux this going to work on embedded device. I've done some investigation by myself but still I'm a bit confused.
Those are my criteria:
Easy to run on Samsung s3c2440 ARM9 machine
Open Source
Works together with Linux
Good community support
I've seen RTLinux and Xenomai. Xenomai looks more like thing for me, but still I'm confused.
Any good advice, pro's and cons?
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我没有对实时系统做过任何工作,但我知道 this 和 这个。我希望它能有所帮助,或者至少能让你走上正轨。
I have not done any work with Real Time systems, but I know if this and this. I hope it helps or that it can at least put you in the right track.
问题是你真的需要硬 RTOS 吗?
你也许可以摆脱像 uClinux http://www.uclinux.org/ 这样的东西
The question is do you really need hard RTOS?
You may be able to get away with something like uClinux http://www.uclinux.org/
如果您需要商业支持,请查看 montavista。
Check out montavista if you need commercial support.
如果您已经决定选择处理器,我建议您找到开发板或套件并使用推荐的操作环境。包括开发工具和操作系统。
If you have decided on a processor, I suggest you find a development board or kit and use the recommended operating environment. Including development tools and OS.
借助 Xenomai 启用的 FCSE,具有实时扩展的 Linux 可以在 S3C2440 等基于 ARM9 的主板上运行得很好。
本演示文稿涵盖了一些概念:http://www.slideshare.net/jserv/realtime-linux
With the aid of FCSE enabled by Xenomai, Linux with the real-time extension can work pretty weel on ARM9 based boards like S3C2440.
This presentation covers some concepts: http://www.slideshare.net/jserv/realtime-linux
如果您需要免费且绝对稳定且具有最低延迟的开箱即用,请考虑 RTEMS(不是基于 Linux,但提供 POSIX 功能)之类的东西。
如果您负担得起,并且想要开箱即用、延迟极低的绝对稳定的东西,并且拥有一个具有所有花哨功能的通用操作系统,请查看 QNX - 它具有与您习惯的相同的 GNU 用户区/工具链,并且是符合 POSIX 标准。
最好避免使用 RTLinux——bug 非常多。 Xenomai/RTAI 可以取得不错的成功,尽管它比 QNX 有更多限制。其他一切都会让你损失大量金钱,所以你不妨选择最好的选择:-)。
If you need free and absolutely stable out of the box with the lowest latencies, consider something like RTEMS (not Linux based, but does provide POSIX functions).
If you can afford it and want something absolutely stable out of the box with very low latencies and have a general purpose OS with all the bells and whistles, check out QNX - its got the same GNU userland/toolchains you're used to and is POSIX compliant.
RTLinux is best avoided - very buggy. Xenomai/RTAI can have decent success, although it has more limitations than QNX. Everything else is going to bleed you for large sums of money so you might as well choose the best option :-).