[ANNOUNCE] RTnet 0.8.0 released
kiszka at rts.uni-hannover.de
Mon Dec 20 19:13:36 CET 2004
As it might be of broader interest this time, this announcement is
spread over the RTAI list too:
The RTnet project, an RTAI-based real-time networking stack with
Ethernet support, has achieved another important milestone on its way
towards a release 1.0. The version 0.8.0 published today includes many
new features and improvements of as yet open issues. The new version is
Most noticable is surely the specification and implementation of the
revised TDMA media access control discipline. A MAC discipline is
required for indeterministic Ethernet to avoid collisions and
congestions. The new TDMA-V2 allows a more flexible transmission time
slot assignment for every node, supports slave hot plugging as well as
backup masters, and further improves the synchronisation of distributed
clocks. Side note: TDMA-V2 now also enables stand-alone implementations
of RTnet like the RT-EtherBoot patch (see below).
Another important step of this release is support for 2.6 kernels in
combination with RTAI 3.1. Even better, thanks to Philippe Gerum's
effort, RTnet can now also work with the RTAI skin of fusion 0.6.6 or 0.6.7.
Here is the full list of changes:
- TDMA-V2 implementation
* multiple slots
* packet delay compensation
* slave hot plugging
* backup masters
- new NIC device driver layer
* atomic transmission time stamp
* improved locking scheme
* layer version tag
- kernel 2.6 support
- RTAI/fusion support (0.6.6 or better)
- source tree reorganisation
- added NoMAC module as skeleton for new disciplines
- revised and extended rtnet start script
- worst-case statistics for rtping
- read stage 1 data for "rtcfg add" from stdin
- fixed cleanup bug in RTmac's VNIC handling
- bug fixes in RTcfg, /proc output, legacy tdma-v1, and some other parts
- Although the new tdma module is already useable and should be
preferred, previous tdma-v1 will still be included in the 0.8 release
- The drivers for the three PowerPC embedded controllers have not yet
been updated to the latest changes. This will happen for the next
release at the beginning of 2005.
- RTAI/fusion support is limited to kernel space in this release. It
is planned to fix this soon.
Also today a new version of the RT-EtherBoot patch was released.
RT-EtherBoot enables disk-less RTnet nodes to retrieve their boot image
over an RTnet-controlled network without violating timing requirements.
Patch v0.2 now supports the TDMA delay calibration procedure in order to
enhance the accuracy of packet transmission times, and it fixes a
critical bug. See RTnet download page.
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