Broken UEFI implementations: Difference between revisions

For CDs to boot without using Boot#### variables or the CSM, they need to be Apple Partition Map formatted, i.e. the format Apple has used since they derived it from the format NeXT used when they bought them. This means to make a disc that works on EFI+Apple+BIOS you need to actually /execute/ the APM header signature on BIOS machines. Thankfully that's pretty safe, but it's a little squicky in your head. [http://www.syslinux.org/wiki/index.php/The_Syslinux_Project syslinux]]'s "isohybrid" utility has had this ability to build this sort of image since version 4.05 .▼