Version 1.10 is unable to build AGFI -- we are blocked

[Sean Halle CTO]

Hello,

   Thank you once again for providing FireSim.  Our startup has raised funding and taped out a 6nm chip riding on FireSim as the centerpiece of our development process.

   Unfortunately, we are now blocked at a critical point in the investment cycle.  We are still on v1.10, due to our Chisel being highly customized and the effort to port to newer versions of FireSim.  From one day to the next, we are unable to build AGFI, due to an error during creation of the c4.4xlarge instance.

Upon investigating, our conjecture is that AWS has removed the CentOS as an option for launching new instances.  Thus, the python is failing that uses the CLI of AWS to create the instance that runs the Vivado tools (which we believe was a CentOS instance).

Does anyone have ideas how to get around this?
What we have discovered so far:
- v1.14 has support for Ubuntu as an option
- v1.17 has Ubuntu as the defaul

- we are able to create c4.4xlarge via the GUI, when we select Ubuntu as the base image
- if we use an Template that previously worked, that Template now fails

Any help would be really appreciated,

Sean