|Developer||eCos community, Free Software Foundation|
|Written in||C, C++, assembly|
|OS family||Real-time operating systems|
|Source model||Open source|
|Initial release||September 1998|
|Latest release||3.0 / March 2009|
|Marketing target||Embedded systems|
|Platforms||ARM, CalmRISC, Cortex-A5, Cortex-A9, Cortex-M3, Cortex-M4, Cortex-M7, FR-V, Hitachi H8, IA-32, Motorola 68000, Matsushita AM3x, MIPS, NEC V8xx, Nios II, PowerPC, SPARC, and SuperH|
|License||eCos License: GNU General Public License (with linking exception)|
The Embedded Configurable Operating System (eCos) is a free and open source real-time operating system intended for embedded systems and applications which need only one process with multiple threads. It is designed to be customizable to precise application requirements of run-time performance and hardware needs. It is implemented in C/C++ and has compatibility layers and application programming interfaces for POSIX and µITRON.
eCos was designed for devices with memory sizes in the range of a few tens or several hundred kilobytes, or for applications with real-time requirements. It can be used on hardware with less than 2 MiB RAM, which is the minimum requirement to support embedded Linux.
eCos was initially developed in 1997 by Cygnus Solutions which was later bought by Red Hat. In early 2002, Red Hat ceased development of eCos and laid off the staff of the project. Many of the laid-off staff continued to work on eCos and some formed their own companies providing services for the software. In January 2004, at the request of the eCos developers, Red Hat agreed to transfer the eCos copyrights to the Free Software Foundation in October 2005, a process finally completed in May 2008.
The eCosPro real-time operating system is a commercial fork of eCos created by eCosCentric which incorporates proprietary software components. It is claimed as a "stable, fully tested, certified and supported version", with additional features that are not released as free software.
The FreeBSD TCP/IP network stack included with eCos is out of date (circa 2001) and exposes systems to numerous security and stability vulnerabilities (FreeBSD RELENG 4 4 0 RELEASE for IPv4 and FreeBSD's origin KAME for IPv6). Official eCos maintainers do not appear to monitor FreeBSD or KAME for security or stability updates, but rather rely on minimal and insufficient bug reports from users of eCos.
- eCos official website. "eCos License Overview". Retrieved 2009-06-22.
eCos is released under a modified version of the well known GNU General Public License (GPL).
- Larmour, Jonathan (May 2005). "How eCos can be shrunk to fit" (PDF). Embedded Systems Europe. p. 34.
- eCosCentric website. "eCos Timeline". Retrieved 2015-07-01.
eCos was conceived and initially developed by Cygnus Solutions Inc., who initiated the project in February 1997.
- "Red Hat backs away from eCos?". linuxdevices.com. 2002-06-19. Retrieved 2007-04-01.
- "Red Hat to contribute copyrights held in the eCos code base to the Free Software Foundation" (Press release). Red Hat. 2004-01-13.
- "eCosCentric announces eCosPro Developer's Kit" (Press release). OSNews. 2003-09-02. Retrieved 2007-03-31.
- eCos Homepage
- "eCos Porting Guide" article by Anthony J. Massa 2001-12-28
- "Embedded Software Development with eCos" book by Anthony J. Massa 2002-11-25, ISBN 0-13-035473-2
- eCosCentric web site