BridgeOS explained

bridgeOS
Developer:Apple Inc.
Working State:Current
Source Model:Closed, with open-source components
License:Proprietary software except for open-source components
Support Status:Supported

bridgeOS is an embedded operating system created and developed by Apple Inc. for use exclusively with its hardware. bridgeOS runs on the T series Apple silicon processors[1] [2] [3] [4] and operates devices such as the OLED touchscreen strip called the "Touch Bar",[5] TouchID fingerprint sensor, SSD encryption, and cooling fans.[6]

At boot time, the bootloader executes the bridgeOS kernel, then the bridgeOS kernel passes off tothe UEFI firmware.[7]

bridgeOS is based on Apple's watchOS.[8]

Notes and References

  1. Web site: 2020-04-17. 10.15.4 Supplemental Update Bricking Small Number of T2 Macs. 2020-08-18. Mr. Macintosh. en-US.
  2. Web site: Inside The Apple T2. Mikhail . Davidov . Jeremy . Erickson . 2019 . blackhat.com.
  3. Web site: Secure Boot in the Era of the T2. Nov 20, 2018. Misha Davidov. duo.com.
  4. A Survey of Hardware Improvements to Secure Program Execution. Lianying Zhao. He Shuang. Shengjie Xu. Wei Huang. Rongzhen Cui. Pushkar Bettadpur. David Lie. ACM Computing Surveys. 56. 12. 1-37. 10.1145/3672392.
  5. Web site: Snell. Jason. Macworld . 2020-07-08. The switch to Apple silicon: Will the Touch Bar survive?. 2020-08-18. Macworld. en.
  6. Web site: TinkerTool System 7, Reference Manual. August 22, 2023. Marcel Bresink Software-Systeme (MBS).
  7. 10.1145/3380774.3382016. 1542-7730. 17. 6. –60:5–Pages 60:21. Frazelle. Jessie. Securing the Boot Process: The hardware root of trust. Queue. 2024-01-14. 2020-02-04.
  8. Web site: Apple iMac Pro and Secure Storage. Pepijn Bruienne. May 2, 2018. duo.com.

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