Hi!
Unfortunately I need my single unit for my lab to work without interruption. And all the units that were available cheap over here in Germany were sold out.
But if I come across a second unit, I will definitely try to upgrade the Linux on the system. Everything needed for that should be on the box.
It also relies on a bigger FPGA and that bit stream is probably not easy to upgrade, but it also may not be necessary if the drivers and applications around it are well enough understood.
It is very likely that the PLL and VCOCXO control is done in that FPGA and as these work fine, there is no need to change. Also it will probably handle the fail-over from GPS to VCOCXO / RB and also combine all the external sources as well as providing all outputs for the external connections without any real software control needed.
If the programmer of the functional applications around web services, NTP and such didn't modify basic structures like kernel drivers and so on, it may also be possible to upgrade the whole Linux and just keep the old applications just going.
What I mean is, that if they used /dev/ttySx for accessing the UART to the GPS module and did not write a code that accesses the CPU internal register to communicate with the GPS, the only thing a new Linux needs to do, is providing the same /dev/ttySx to the same physical serial port and the software still works.
And I bet there are specialists available here in the forum, that will provide some nice modern web interface
![Wink ;)](https://www.eevblog.com/forum/Smileys/default/wink.gif)
But I checked, there are currently no S200 or S250 available that are affordable for such an experiment and the need the one I have running 24/7