> Apple explicitly designed in support for booting other operating systems into the M-series chips Thank Xeno, who has since been creating open-source training

> Apple explicitly designed in support for booting other operating systems into the M-series chips Thank Xeno, who has since been creating open-source training on low-level firmware security at https://p.ost2.fyi https://p.ost2.fyi, a new iteration of open training material published ~15 years ago at https://opensecuritytraining.info https://opensecuritytraining.info before joining Apple. https://archive.fosdem.org/2022/schedule/speaker/xeno_kovah/ https://archive.fosdem.org/2022/schedule/speaker/xeno_kovah/ his final project was leading the M1 SecureBoot architecture - being directly responsible for designing a system that could provide iOS-level security, while still allowing customer choice to trust arbitrary non-Apple code such as Linux bootloaders.