User:Pjones/MacCDsForEFI

Bootable EFI CDs on Intel Macs

Bootable EFI CDs on an Intel Mac are a bit different than a normal EFI CD. As such, they need special support.

What's needed

• HFS+ support for blessing a file
• make dumpet correctly interpet and display hybrid iso/apm CDs and HFS+ blessing
• Ability to create image files for the icon and label to be used on the boot option screen
• Ability to create CD that has el torito images as well as an Apple Partition Map which specifies the HFS+ image as a partition.
• icon/label images included in *-logos
• modification of mk-images to create the appropriate HFS+ image and add it to CD images.

Current Status

Sub-task	Percent Complete	Notes
HFS+ bless	100	Apparently we can do this now. Two bytes in the HFS+ superblock need to be set to point to the inode of the appropriate file, which can be determined with ls -i. Code written (http://www.codon.org.uk/~mjg59/bless.c)
icons	0	We know how to create them. generic-logos has a sample implementation and builds the Mac icon (/usr/share/pixmaps/bootloader/fedora.icns) and this should be installed as .VolumeIcon.icns
dumpet modification	30	pjones working on this - progress info at http://git.fedorahosted.org/git/?p=dumpet.git
create hybrid APM CDs	0	pjones working on this - plan is to make mkisofs use libapplepart provided by dumpet
*-logos	0
mk-images	0	blocking on stuff above
isohybrid integration	0	the plan for this is insane - basically, it's to pick a creative value which decodes to benign x86 insns for the volume size in the apple partition map, and stick a jmp into the next field, then stick the actual isohybrid code a bit later where we've got some space.

Alternate Approach

There's also another way:

• Put a GPT table on the CD
• Create an EFI System Partition that points at the El Torito image
• copy /usr/share/pixmaps/bootloader/fedora.icns to \.VolumeIcon.icns
• Put a label file at \{somefile}
• Make sure the bootloader looks at the iso9660 image instead of El Torito or the EFI System Partition.