This was about a month's worth of work. It boots on ARM PBA8, RealView EB (needs some timer hacks for it to work), and TI OMAP3 based platforms. Dyld will load but loading launchd will fail due to some VFS corruption issue. There are a ton of issues in this codebase, but hey, you get a cool framebuffer and serial output from something that's not Linux or xxxBSD.

Have fun.

(I'm 16 by the way.)

Impressive, how long did it take you and what were your motivations, if any, beyond fun and learning?

About a month to do this, and I had no real motivation other than boredom. :)

Amazing stuff. Will this build with standard GNU tools, or do you need XCode?

You'll need the standard stuff that compiling xnu requires.

This includes: dtrace, cxxfilt, kext_tools, bootstrap_cmds