...

Matt writes about the GMD/XGMD variables above:  "Yes, these are the variables you describe (to determine the structure of the bld).  I think read only should be fine.  Also, I think pvget is expected to fail.  I think the proper access is something like pvinfo." (although cpo tried and couldn't get either pvget or pvinfo to work).  Matt later adds: "The PV is actually EM1K0:GMD:HPS:BLD_PAYLOAD which is still inaccessible.  I think that's because the accelerator doesn't yet have a PVA gateway.  Our bld process uses EPICS_PVA_ADDR_LIST=172.27.131.255 to access it directly" so the above entries in mcc-daq.pvlist are incorrect and can be removed completely.

Bypassing Gateways

Router work has been done to allow EPICS variables to be accessed using EPICS_CA_ADDR_LIST and EPICS_PVA_ADDR_LIST.  Some details are here: ACR Realtime Feedback#RouterNetworkSupport