Experimental Physics and
Industrial Control System

Michael Davidsaver via Tech-talk <tech-talk at aps.anl.gov> · Fri, 11 Jun 2021 07:49:17 -0700

Hi Pete,

On 6/11/21 5:37 AM, Siddons, David via Tech-talk wrote:
> I'm trying to learn how to build EPICS 7 for RTEMS 5. I'm starting with the beagleboneblack BSP since it is already in the system. I can build everything fine, and the test IOC loads and starts. By default it assumes that all ancillary files (st.cmd, db, dbd etc.) will be loaded via NFS. My situation is such that this is not a viable system. I remember in earlier RTEMS versions it was possible to make an IMFS from a tar appended to the bootable binary. I can see hints of that in libcom, but I can't see how to configure the system for that. Has anyone done this?

I don't think I was ever able to make IMFS work, though it has been awhile
since I looked into this.  Perhaps this was just me.

I added a simpler, though less efficient/functional, mechanism to enable
self-contained unittest executables.  This hooks in via a global variable
'epicsRtemsFSImage' [1].  There is an associated script 'epicsMakeMemFs.pl'.

This is used by adding a Makefile rule to package some files.  In one example [2]
the files names are stored in "$(TESTFILES)".

> PROD_SRCS_RTEMS += rtemsTestData.c
...
> include $(TOP)/configure/RULES
...
> rtemsTestData.c : $(TESTFILES) $(TOOLS)/epicsMakeMemFs.pl
> 	$(PERL) $(TOOLS)/epicsMakeMemFs.pl $@ epicsRtemsFSImage $(TESTFILES)

[1] https://github.com/epics-base/epics-base/blob/3c329c1b48fd25f337745764dd853c3d343f12b5/modules/libcom/RTEMS/posix/rtems_init.c#L210

[2] https://github.com/epics-base/epics-base/blob/3c329c1b48fd25f337745764dd853c3d343f12b5/modules/libcom/test/Makefile#L338-L339

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System