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A comment on How We Ported Linux to the M1. Parent comment

Re:How We Ported Linux to the M1 by sneak on Thursday January 21, 2021 @12:29PM (#25861456)
> To actually connect the USB port inside the M1 to the USB type-C connectors on the back of the Mac Mini, we had to interact with a chip on I2C (which means GPIO and I2C drivers) which has customized firmware. We've seen the protocol for these while building our virtualized models; nothing is a big surprise if you have a bird's eye view of the system.

You're not kidding. This is more of a flex than an explanation.

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