microkernel task scheduler -> RTOS scheduler info

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Hello  All

My company  is in the beginning phase of rewriting an embedded
task-driven operational flight program from an ancient processor (Z8000
in ASM) to a modern language that will run on a PowerPC processor.

My question is this:  Does anyone have any documentation or paper
information on what types of issues, pitfalls, and obstacles usually
pop up when going from a dedicated, mature microkernel to another
(commercial) OS.  I predict the RTOS will be a commercial RTOS from
OSE, Wind River or Green Hills.  What I'm specifically looking for is
(in addition to lessons learned and general stuff mentioned above)
information on how to perform the task switching and interrupt
arbitration handled by the old tasking kernel on a new POSIX type task
switching OS such as OSE, VxWorks or Integrity.

Any thoughts, horror stories, or documents are more than welcome.

Thanks all.

Re: microkernel task scheduler -> RTOS scheduler info

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Do you know what a "microkernel" is?  QNX, as one example, is a
commercial, microkernel-based RTOS, which is POSIX compliant and is
intended for embedded applications.  

The issues will be at least partly dependent on how generalized your old
OS is or whether apps functionality was incorporated into it.  If the
partitioning was kept very strict, the issues should be minor.  If the
line was allowed to blur, well ...

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Do you need DO-178B certification?  That may be an issue in selection if

VxWorks from Wind River has a steep learning curve coming from your
current environment.  Not only will you need to learn the OS, but also
Workbench. Have you used Eclipse?  Point your browser to www.eclipse.org
for a preview of Workbench--it is based on Eclipse.  I believe Wind River
only supports the GNU and Diab C/C++ compilers, so those better be your
"modern language."  

Some of the RTOS vendors do have papers/info on porting on their sites.  
Exception:  Wind River.  You basically cannot get any info from their
website unless you are a registered customer.  www.qnx.com has a lot of
info available, including a VxWorks Porting Guide, as I recall.  ;-)


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