Source code for Boot-132 was released allong with the XNU kernel in the 10.4.8 set of tarballs. Boot-132 was used with the last version of OS X for the DTK systems. Previous releases used boot-122 or earlier versions of Apple boot.
The Boot-132 method
The Boot-132 method was first proposed by David Elliott in 2007.
- Darwin/x86 - The Bootloader - David Elliott, 2007 - 2008