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There's something weird going on with the Opal, which worked fine yesterday.  Ric has taken several tmo.cnf runs without any complaints from the opal DRP.  All transitions go through fine, as do SlowUpdates.  Yet readout group 7 is 100% dead.  XPM:2 AMC0 channel 6 RemoteLinkId is 'undef' and the LinkRxErrs are counting.  Attempts to reset the channel (either Rx or Tx) don't seem to have any effect.  I'm pretty sure this channel is the one that's connected to the Opal.   There's no indication that there's anything wrong with data taking: no errors or damage.

I'm not sure whether it's related, but the above error where the ts DRP is timing out trying to write to an XPM register is happening more frequently than usual.

Actually, after a few more tries, I find that the system runs as described above after a fresh 'procmgr start tmo.cnf', but cycling the state machine from Running through Reset back to Running causes the TimingSystem XPM register write failure.  Without the Opal included, this does not happen.