Coordinating firmware development among many international collaborators is becoming a very
widespread problem in particle physics. Guaranteeing firmware synthesis with place and route
(P&R) reproducibility and assuring traceability of binary files is of paramount importance. Our
HDL managing tool, developed in Python and tightly integrated with CERN Gitlab and Xilinx
Vivado, tackles these issues by exploiting advanced Git features and by paying particular attention
to Intellectual Property handling. In LHC Run-3, the ATLAS L1Calo Trigger system will be
upgraded with new feature extraction and readout modules and our tool is used for the firmware
development for these modules.