Frozen FPGA's PVs & NTP

[José Pérez Vidal via Tech-talk <tech-talk@aps.anl.gov>]

Hello, 

Just so you you can be informed about basic information about 

my system:

- I am using EPICS version 3.15.5

- My board has an FPGA ZYNQMP UltraScale

- I am using Buildroot 2019.02.9 to generate my OS image

I have encountered the next issue:

PVs that you read from the FPGA get "frozen" if the EPICS driver is

started before the NTP Synchronization is done. Is this just a 

coincidence? Am I missing something about these PVs? Is there really

a relationship between system time and the correct functioning of 

the IOC? If not, what could be freezing the PVs.

I have temporarily solved this by just waiting for the NTP to get

synchronized so that the System Date is corrected, but I wish I

could just start it and "unfreeze" those PVs. Is there any kind of

way I can make the channel access independent from any given time?

Thanks a lot in advance,

Pepe.