Re: [Mactel-linux-devel] Universal Live CDs

[<gi...@da...>]

Hi.

Thanks for your hint. Tryed it and seems to work on
the live CD.

cu

Edgar /gimli) Hucek

Christoph Pfisterer <cp...@ch...> schrieb :

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>=20
> Hi,
>=20
> I've done some research and found a way how we can make a Live CD =20
> that boots Intel Macs as well as standard PCs.
>=20
> Here's the trick:
> * The Intel Mac firmware will only boot from HFS+ volumes.
> * Apple built on Intel's EFI sample implementation and left the part =20
> of the code intact that makes El Torito boot images available as if =20
> they were partitions on a disk.
> * You can have more than one El Torito boot image entry, EFI doesn't =20
> care.
> * For it to actually work, you'll have to wrap the HFS+ partition in =20
> a Apple Partition Map. (Probably something to do with sector sizes. =20
> EFI keeps the 2K sector size for non-emulated images, and mkisofs =20
> requires an MBR to use hard-disk emulation.)
>=20
> An outline of a preparation procedure:
> * Make an empty disk image on OS X. By default, Disk Utility will use =20
> HFS+ wrapped in a Apple Partition Map (just what we need).
> * Fill that image with elilo, EFI-capable kernel, initrd, and either =20
> ebounce.efi or rEFIt. Bless the appropriate loader (refit.efi or =20
> ebounce.efi).
> * Unmount the disk image, and convert it into a &quot;CD/DVD master&quo=
t; =20
> image, extension .cdr. That's actually a plain image.
> * Build the Live CD with the usual ISO9660 filesystem and ISOLINUX, =20
> but also put the macboot.cdr (or whatever) image in there and use =20
> mkisofs parameters like these:
>     -b boot/isolinux.bin -no-emul-boot -eltorito-alt-boot -b boot/=20
> macboot.cdr -no-emul-boot
>=20
> AFAIK a standard PC will just use the first El Torito entry and get =20
> ISOLINUX. The Mac however will just make both El Torito entries =20
> available as block devices, notice the APM partition map on the =20
> second one and the HFS+ partition in there, and offer that as a =20
> choice in the built-in boot loader.
>=20
> I haven't tried this on an actual Live CD because I don't have the =20
> setup to make one, but booting a Mac this way can be verified easily. =20
> Just make an image using mkisofs with rEFIt-0.3.cdr as an El Torito =20
> image. It will show up in the built-in chooser.
>=20
> So long,
> chrisp
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> - --=20
> chrisp a.k.a. Christoph Pfisterer   &quot;If that makes any sense
> cp...@ch... -
> http://chrisp.de      to you,
> you have a big
> PGP key &amp; geek code available        problem.&quot;
>=20
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> sexUCFfCbDpgrXbAxhcaGBI=3D
> =3DjJRo
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