At the moment FreeBSD has only been booted with the CVS version of Cromwell, a bootloader BIOS for the Xbox, as of Mon Jul 25 16:15 UTC. Earlier versions of Cromwell will not work because of restrictions in bootable filetypes (only Linux kernels, no ELF executables). The next release of Cromwell (2.41) will support FreeBSD out of the box. The demo CD which is for download below contains a CVS version of Cromwell, so you can chainload to it if you're running an older version. It also contains Cromwell in XBE form, so you could probably boot the CD on almost any Xbox that doesn't block unsigned binaries. (This XBE file hasn't been tested, as we don't have a modchipped XBOX. Testers are welcome

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Read More/Source:
http://nexus.il.fontys.nl/