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    Can someone explain what bridgeOS is?

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      eOS 1.0 (which was renamed BridgeOS) was driving the touch bar in 2016/2017 MacBook Pros. BridgeOS 2.0 is the OS for essentially a system management controller capable of booting the x86 CPU and controlling a set of I/O, mainly so Apple can control the security model and do things like “Hey Siri.” (It uses an A10 Fusion SoC.)