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Every auto company manages the software release process differently. There's typically an in-house software tool to track different levels of software releases and the associated calibration values. It might go something like Matlab/Simulink --> hardware and/or software in the loop simulation --> in house tool/software database --> prototype ROM files and map definition file. That will go into a prototype ECU for realtime tuning or a production one (flashing the ECU for changes) if the vehicle is almost ready for launch and the software tweaks are small.
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