Experimental Physics and
Industrial Control System

Hi Matt,

On 06/07/2018 03:20 PM, Matt Rippa wrote:
> The 2500 path looks like our best choice. We can still use the
> 6100/beatnik and 2700 boards in the mean time.

While I agree tentatively about your choosing the 2500, you do need to
be aware that Heinz's EPICS support for RTEMS 5 is aimed at EPICS 7 (it
hasn't been merged yet), and the switch from RTEMS 4.10 to 5.x is not a
minor change from our perspective.

The Kernel APIs that our libCom/osi routines call had to be changed from
the old RTEMS-native interfaces to the Posix ones of RTEMS-5, so there's
quite a difference. We had to make changes to the EPICS build system for
it to be possible to have two implementations of the same OS-dependent
routines for the two different kernel APIs under the same OS_CLASS
(since where possible the RTEMS-5 build should use our standard Posix
implementations). We didn't want to introduce a new RTEMS5 OS_CLASS
since that would break existing EPICS support modules which should
otherwise still work (providing they only call our OSI APIs).

It is also not possible to mix RTEMS versions in the same installation
of EPICS Base, since EPICS RTEMS builds rely on Makefile configurations
and rules from RTEMS' own build system. The RTEMS path and version must
be set in the base/configure/os/CONFIG_SITE.Common.RTEMS file and cannot
be overridden in a target-specific CONFIG file (because by the time
those files get read in we've already read in a lot of RTEMS build
configuration data).

Sorry, just want you to know...

- Andrew

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