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eCos is
an open source, royalty-free, real-time operating system intended for
embedded applications. The highly configurable nature of eCos allows
the operating system to be customised to precise application
requirements, delivering the best possible run-time performance and an
optimised hardware resource footprint. Aeroflex Gaisler has developed
and contributed the LEON2 and LEON3 ports of eCos, which include the
following functionality:
- Symmetric multi-processing (SMP) for LEON3
- Hardware FPU support
- Network drivers for GRETH, GRETH_GBIT, LAN91C111 and OpenCore's 10/100 Mbit MACs
- Single-vector trapping (SVT)
- Non-windowed (flat) register model
- Possible to run eCos in RAM and ROM
For further information concerning eCos, please refer to the eCos home page.
eCos versions
The LEON port is supported in the eCos-cvs branch. The latest version can be downloaded from our software download page.
Tool-chain
eCos is built by the BCC cross-compiler.
How to configure and build a system on linux
Untar
the eCos distribution at a suitable location, set the ECOS_REPOSITORY
environment variable to the path of the ecos/package directory, eg:
export ECOS_REPOSITORY=/home/jiri/ecos/packages
The kernel is built in a seprate directory. To create a leon2 configuration, do:
ecosconfig new sparc_leon
A leon3 configuration should be made with:
ecosconfig new sparc_leon3
A leon3 configuration with TCP/IP network support and GRETH MAC driver should be made with:
ecosconfig new sparc_leon3_greth net
You can then use the eCos configtool to graphically select the eCos parameters and built the system:
configtool ecos.ecc
To enable SMP on LEON3 multi-processor systems, you must enable SMP in both the SPARC HAL and the kernel settings.
Refer to the eCos documentation for details on further use.
How to configure and build a system on win32
Use Mingw's MSys enviroment to build ecos and use ecosconfig-mingw.exe instead of ecosconfig.exe
export ECOS_REPOSITORY=c:/ecos/packages
ecosconfig-mingw new sparc_leon3
ecosconfig-mingw tree
make
The makefile generated by "ecosconfig-ming tree" will transform c:/ to /ecos-c/, therefore add a entry in MSys's
/etc/fstab:
c:/ /ecos-c
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Copyright 2008 Aeroflex Gaisler AB.
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