The postmarketOS and Alpine Linux Conference

xiotrace - XNU I/O tracing
2026-09-27 , 5053.1 (Großer B-IT Raum)

xiotrace hooks the XNU kernel used on certain mobile devices in order to trace I/O operations such as SPI transfers. This can be useful for understanding the protocol used by peripherals like the touchscreen.

I will present the previous work leading up to this project, my approach, and a few neat tricks I used in the implementation.

I'm a hacker from Aachen who likes to explore the nitty-gritty details at the hardware-software boundary.