name = RTEMS
developer = OAR Corporation
supported_platforms = ARM,
Blackfin, ColdFire, TI C3x/C4x, H8/300, x86, 68k, MIPS, Nios II, PowerPC, SuperH, SPARC, ERC32, LEON, Mongoose-V
Real-time operating systems
latest_release_version = 4.9.0
latest_release_date = September 2008
latest_test_version = CVS head
working_state = Current
license = Modified
website = [http://www.rtems.com/ www.rtems.com]
RTEMS (Real-Time Executive for Multiprocessor Systems) is a free
open source real-time operating system(RTOS) designed for embedded systems.
The acronym RTEMS initially stood for "Real-Time Executive for Missile Systems", then became "Real-Time Executive for Military Systems" before changing to its current meaning. RTEMS development began in the late 1980s with early versions of RTEMS available via ftp as early as 1993. OAR Corporation is currently managing the RTEMS project in cooperation with a Steering Committee which includes user representatives.
RTEMS is designed for real-time, embedded systems and has been ported to various target processor architectures:
RTEMS is designed to support various open API standards including
POSIXand uITRON. The API now known as the Classic RTEMS API was originally based upon the Real-Time Executive Interface Definition (RTEID) specification. RTEMS includes a port of the FreeBSD TCP/IP stackas well as support for various filesystems including Network file systemand the FAT filesystem.
RTEMS does not provide any form of memory management or processes. In POSIX terminology, it implements a single process, multithreaded environment. This is reflected in the fact that RTEMS provides nearly all POSIX services other than those which are related to memory mapping, process forking, or shared memory. RTEMS closely correponds to POSIX Profile 52 which is "single process, threads, filesystem". [ [http://www.linuxdevices.com/news/NS3992179355.html Open Group pilots embedded real-time POSIX conformance testing ] ]
RTEMS is used in many application domains. The
EPICScommunity includes multiple persons who are active RTEMS submitters. RTEMS is also popular for space uses since it supports multiple microprocessors developed for use in space including SPARC, ERC32and LEON, MIPS Mongoose-V, Coldfire, and PowerPCarchitectures, which are available in space hardened models. RTEMS is currently orbiting Mars as part of the Electra software radio (see Mars Reconnaissance Orbiter).cite web |url=http://trs-new.jpl.nasa.gov/dspace/bitstream/2014/39788/1/06-0474.pdf|title=Real Time Mars Approach Navigation aided by the Mars Network |accessdate=2008-01-25 |format=PDF |publisher=NASA]
RTEMS is distributed under a modified
GPLlicence, allowing linking RTEMS objects with other files without requiring the full executable to be covered by the GPL. This license is based on the GNAT Modified General Public Licensewith the language modified to not be specific to the Ada programming language.
* [http://www.rtems.com/ Official RTEMS website]
* [http://www.rtems.com/wiki/index.php/Main_Page Official RTEMS Wiki]
* [http://rtemscentre.edisoft.pt RTEMS CENTRE]
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