Linux Finally Gets Thunderbolt on Apple Silicon

> This is a pretty significant milestone for anyone interested in running Linux on Apple Silicon. > > The Asahi Linux work around Apple’s proprietary ACIO subsystem is what makes it possible. The interesting part is just how much reverse engineering was required: > • Cortex-M3 co-processor + firmware loading > • 16 MiB temporary MMIO window > • DART IOMMU and DMA restrictions > • CD321x / Type-C PHY sequencing > • Changes to the Linux Thunderbolt core > > The initial implementation supports USB3-via-USB4 and XDomain, while PCIe and DisplayPort tunneling are still missing.