Apple might not be releasing documentation on their peripherals, but they went out of their way in making it possible in the first place. Apple could just have

Apple might not be releasing documentation on their peripherals, but they went out of their way in making it possible in the first place. Apple could just have gone and do a straight port of the iOS boot procedure to their ARM Mac lineup... and we'd have been thoroughly screwed, given how long ago the latest untethered bootrom exploit was. Or they could have pulled a Qualcomm, Samsung et al and just randomly change implementation details between each revision to make life for alt-os implementers hell (which is why so many Android BSP dumps are the way they are, with zero hope of ever getting anything upstream). Instead, to the best of my knowledge the UART on the M series SoCs dates back right to the very first iPod. The fact that the Asahi Linux people were able to create a GPU driver that surpasses Apple's own in conformance tests [1], despite not having any kind of documentation at all is telling enough - and not just of the pure genius of everyone involved. [1] https://appleinsider.com/articles/23/08/22/linux-for-apple-silicon-adds-first-conformant-m1-gpu-driver https://appleinsider.com/articles/23/08/22/linux-for-apple-s...