Experimental Physics and
Industrial Control System

Benjamin Franksen <[email protected]> · Sat, 29 Jun 2013 23:38:13 +0200

Hi Andrew

Am Samstag, 29. Juni 2013, 19:09:40 schrieben Sie:
> I have added some runtime checks to the generated
> registerRecordDeviceDriver routine and to iocInit for a few things such as
> whether TOP is the same, but I don't think it's possible to do what you
> want.
>
> We don't know at compile-time that you aren't planning to load the xyz
> module from some other .munch file or lib.so shared library (and although
> I don't particularly recommend it, that is something which Dirk Zimoch
> wants to be able to do).

Ok. I understand that. Loading stuff bit by bit at runtime can be very handy.

> Now I could conceive of some kind of optional way
> to test your binary for completeness(which Dirk would not use), but for
> VxWorks that would require that we know all of the symbols that your
> specific VxWorks boot image provides since those are symbols which are
> supposed to be undefined in your .munch file.

Hmm. I see. I wonder why loading a binary that references undefined symbols is
just a warning and not a fatal error, so the startup script would stop at this
point. Or, is there a way to make it one? (This is actually more a VxWorks
question, not much to do with EPICS).

OTOH, I could imagine doing just what you said: checking for all symbols to be
defined by (additionally) scanning the boot image for symbols. I think we have
the tools available, don't we? Do you think it would be possible to hack
something up and (optionally) add it to our build rules?

> That seems like it might be half-way to us creating a fully bootable image
> file containing both the IOC application code and the VxWorks OS, but I
> don't think that would be quite as easy as it might seem because getting
> initialization right (C++ static initializers for our code) could be
> tricky. Has anyone ever tried to do that?

Not me; but isn't that what we do (by default) for RTEMS?

Cheers
--
Ben Franksen
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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System