> >> 1.) If I donīt page align the size of shared memory (multiple of
> >> 4096)...
>  The restrictions for page allignments affect the addr and offset
>  paraemters only. To me it seems clear that mmap() in plain Linux and
>  Xenomai behave differently.

Sorry for not having the start of the thread. I'm not sure if it is 
helpful to note that when I implemented memory mapped "device drivers" 
for our system I had to align the address and offset to the page size 
before the call to mmap would succeed. That was with plain Linux and the 
driver also works with Xenomai.

                                      - Tom

-- 
Thomas Lockhart
Supervisor, Distributed and Real-time Group
Instrument Software and Science Data Systems
Caltech/JPL