7acb51f681
This is part of a project for adding the ability to create hybrid CD/USB boot images. In the BIOS case when booting from something that isn't a CD we need some extra boot code to actually find our next stage (loader) within an ISO9660 filesystem. This code will reside in a GPT partition (similar to gptboot(8) from which it is derived) and looks for /boot/loader in an ISO9660 filesystem on the image. Reviewed by: imp Sponsored by: iXsystems, Inc. Differential Revision: https://reviews.freebsd.org/D14914