Experimental Physics and
Industrial Control System

Benjamin Franksen via Core-talk <[email protected]> · Thu, 10 Jan 2019 13:26:16 +0100

Am 07.01.19 um 21:28 schrieb Johnson, Andrew N. via Tech-talk:
> The main complication with RTEMS 5.x which Heinz's not-yet-merged
> implementation handles is that the OS APIs changed when RTEMS added SMP
> support. We wanted to switch to the new Posix APIs for RTEMS 5.x, but
> the EPICS build rules make that hard to do without breaking support for
> RTEMS 4.x builds.
> 
> There is a hint of our final solution in the presentation below, where
> on slide 14 you can see there are now 3 source subdirectories: RTEMS,
> RTEMS-kernel and RTEMS-posix. I won't explain why, just saying that this
> wasn't a trivial thing to do while still supporting older versions of
> RTEMS and not completely breaking applications that are using
> OS-specific source files in a src/os/RTEMS directory (e.g. iocStats).
> 
> Heinz's code can be seen in a couple of git repo's on Launchpad, but it
> hasn't been updated to the latest Base releases. It should be possible
> to apply the necessary changes to the 3.15 branch instead of to 7.0, but
> there will need to be some work done to get anywhere from their current
> state (which IIRC pre-dated our recombining libCom into the EPICS core
> branch):
>   https://code.launchpad.net/~epics-core/epics-base/+git/rtems5
>   https://code.launchpad.net/~epics-core/epics-base/+git/rtems5libcom
> 
> If others want to help with this I wouldn't expect Heinz to say no.
> Please use the core-talk mailing list for any technical questions and
> discussions.

We are also very much interested in getting RTEMS5 support into base,
preferably in a clean and backward compatible way. We have previously
offered to help with merging Heinz' changes and the offer still stands.

Cheers
Ben

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System