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RE: system V interprocess communication (ipc) ?

> (no MMU => you can actually share 
> memory by just letting other processes know which address to 
> use).

I should add that if you try this you must really know what you are doing and carefully read elinux/Documentation/elinux.txt. There are several things that you must be aware of. For example: the process that shares the memory must not exit while other processes are still using the memory. It is not a beautifyl way of sharing memory and _very_ ETRAX 100/elinux specific (not portable, depend on lack of MMU).