FireSim also supports running a fedora-based linux workload. To build this workload, you can follow FireMarshal's quickstart guide (replace all instances of br-base.json with fedora-base.json).
To boot Fedora on FireSim, we provide a pre-written FireSim workload JSON firesim/deploy/workloads/fedora-uniform.json, that points to the generated Fedora images. Simply change the workloadname option in your config_runtime.ini to fedora-uniform.json and then follow the standard FireSim procedure for booting a workload (e.g. single-node-sim or cluster-sim).