Linux for Embedded and Real-Time Systems
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1 Linux for Embedded and Real-Time Systems Kaiserslautern 9 June 2005 Samir Amiry (samir.amiry@iese.fhg.de) Fraunhofer IESE Institut Experimentelles Software Engineering
2 Outlines Introduction. Linux: the OS. Embedded and real-time systems. RTOS. Linux and embedded systems. Linux and real-time systems. RTAI. RTAI characteristics. Examples. Demo: the RTLOpen prototype. Conclusion. Page 2
3 Introduction Context of the work: RTLOpen. What is RTLOpen? Is an effort to build: flexible, performant, future-proof for SMEs in mechanical engineering. Domain characteristics are: real-time requirements, complex calculations, interoperability, safety, quality, reliability and longevity. Expected results: Freely available reference architecture based on one or more variants of embedded or real-time Linux kernels, interface specifications, communication and exchanging formats, as well as development methodologies, techniques and tools. Partners: Hofmann Maschinen (balancing machines, test equipment for rims, tires and wheels as well as tire mounting systems). Berghof (CANtrol Steuerungen und Dialog-PC Design-In Projekte mit CANtrol, Testsysteme zur Qualitätssicherung, IT Lösungen + Bahntechnik). Vision Tools (Industrial Image Analysis Systems (Quality control, Character recognition, Robotics) for car manufacters and their suppliers). Why did we choose Linux? Page 3
4 Introduction (Cont.) Because of many facts (cheap, open, big supporting community in Internet), Linux gains a big popularity; it is used in: Jetfighters, Phones, Satellite receivers, desktops, etc. Today, Linux shows its capability to be used in embedded/real-time systems. The open source community is continuously providing solutions for making Linux used in embedded/real-time systems: New kernel architecture (2.6), RTAI, etc. Linux benefits: Open source. Free (we can put an explanation of what does free means). Most probably, you will find what you are looking for (code, component, etc). Hardware support and software utilities. Page 4
5 Introduction (Cont.) Examples that uses Linux: Linux counts thousands of success stories Page 5
6 Linux: the OS What is the origin of Linux? Started by Linus Torvalds in Followed the design of UNIX. Released as open source: GNU public license. Nowadays: Widely used, with a large number of developers; very promoted in academia as well as in industry. Linux is used in small and big systems. Many distributions are available: Redhat, Slackeware, Suse, Fedora, Debian, Mandrake, Knoppiks, Yellow Dogs, Slackeware, etc. Available for download for free from internet (with its source code). Page 6
7 Linux: the OS (Cont.) A little about Linux: User Applications: kwrite, emacs, etc. Memory Manager O/S Services: command shell, etc. Linux Kernel: intermediate between the hardware and software. (no clear boundaries) Hardware Controllers: all possible hardware resources File System Process Scheduler Network Interface Inter-Process Communication Page 7
8 Embedded and Real-Time Systems What are embedded systems? Are a special-purpose computer system completely encapsulated by the device (or the system) it controls. An embedded system has specific requirements and achieve pre-defined tasks. Example: Phones, mobiles, PDA, DVD players, aircraft control system, ATM machines, cars navigation systems, etc. What are real-time systems? Describes an application which requires a program to respond to an event within a small pre-defined upper bound time limit (we are talking about guarantee). There are two types of real-time systems: Soft-real-time systems: meeting the constraints in a statistical basis. Example: Video conference. Hard-real-time systems: meeting the constraints all the time. Example: the airbag system. Page 8
9 Embedded and Real-Time Systems (Cont.) Page 9
10 Real-Time Operating System (RTOS) A Real-Time Operating System (RTOS) is an OS design for use in real-time applications. RTOS characteristics: Reliability: an RTOS should be available and should not fail. Predictability: an RTOS should meet the timing requirements for applications (tasks) it runs. Performance: to fulfill time requirements, an RTOS should be fast enough. Compactness: in general, RTOSes are deployed as embedded systems; thus, they should be compact. Scalability: systems exist under different sizes in terms of resources; to deal with this, it should be possible to scale up and down an RTOS. Page 10
11 Linux and Embedded Systems Nowadays, Linux is widely used in embedded systems. Many open source and commercial tools are available to support the production of Linux software for embedded systems; they range from use-case tools like ArgoUml, Poseidon, etc; to debugging tools like gdb (with remote debugging capabilities). Linux can be deployed in very small systems like 68EZ328 DragonBall Microcontroller (16MHz, 2 MB Flash ROM 8 MB DRAM). Linux can be deployed in very big servers (GBytes of RAM, TBytes of hard-drives, many CPUs). Page 11
12 Linux and Real-Time Systems Linux has no real-time capabilities because: Kernel calls are not preemptible. Paging (swapping in/out pages is not suitable for realtime). Fairness in scheduling (not suited for real-time). I/O request reordering. Batching (Linux batches operations). Motivation for making from Linux an RTOS: Linux is cheap. Linux is open source. Linux has a worldwide support over internet. Nowadays: there many solution that were presented to make from Linux an RTOS. Examples: RTLinux, VXworks, RTAI, etc. We did chose RTAI for the RTLOpen project. Page 12
13 RTAI What is RTAI? Stands for: Real-Time Application Interface. First version appeared in 1991 in DIAPM (Italy). Patent: (partly) GPL (Note: no conflict should be existing with the Linux/GNU patents). More information can be found at: RTAI provides a rich set of services for making realtime programming in Linux possible. Using RTAI, real-time programming is possible at the kernel level (in the LKM manner) and at the application level (LXRT). Facts: Best maximum UP latency: 3552ns. Best maximum LXRT latency: 9602ns. RTAI uses now ADEOS (a hall in the kernel). For more info: Page 13
14 RTAI (Cont.) RTAI architecture: Page 14
15 RTAI Characteristics Getting RTAI running: Step1:patching the Linux kernel with Adeos. Step 2: compiling and installing the new Kernel. Step 3: compile and install RTAI. Can I install RTAI on a target machine? Yes, by a cross-compilation. RTAI provides: Task structures and a rich library for manipulation. scheduler (fixed priority and round robin).. Loading RTAI: Save current status of the registers. Manipulate its own tasks on the lowest level of the hardware. Finishes and restores last saved registers. Linux keeps working as nothing did happen, but its no more the machine s master. Page 15
16 RTAI Characteristics (Cont.) Timers & controller: RTAI provides periodic and oneshot timers. Controller: timer interrupt handler. RTAI modules: Real-time scheduler. POSIX API. LXRT (user space real-time tasks). Shared memory. FIFOS and Semaphores. Shared memory & FIFOS: Enables communication between processes (user/kernel space). FIFO: device like Linux files that can be used within RTAI. Shared memory: shared memory regions to exchange data. LXRT: enables writing real-time programs in the user space. Device drivers: Serial ports, standard parallel ports, Ethernet cards, etc. Page 16
17 Examples RTAI success stories: Platino: the laser cutting machine (prima industrie) RTAI software radio transmission antenna and AM receiver Enhanced Machine Controller Project Many others in: Page 17
18 Demo: The RTLOpen prototype The RTLOpen prototype: the labyrinth game (live demo after the second presentation). Configuration: Hardware: Control machine via LTP, step engines with a controlling card, labyrinth Game, mouse, and a battery. Software: Linux fedora, kernel 2.6, RTAI 3.1, programming language C. Page 18
19 Conclusion Nowadays Linux is becoming one of the most popular OSes for a large number of systems. RTAI is powering Linux with good real-time capabilities that makes Linux/RTAI a promising RTOS. However, Linux/RTAI should be powered by modern software engineering concepts for enabling the production of high-quality software; we list as examples of these concepts: Component-based software engineering concepts. Safety and security aspects. Inspection and testing. One-hand framework production environment. Fraunhofer IESE solution: RTLOpen. Page 19
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