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Re: grub-probe fails to find PC partition due to Apple disklabel

From: Robert Millan
Subject: Re: grub-probe fails to find PC partition due to Apple disklabel
Date: Mon, 28 Jul 2008 23:20:26 +0200
User-agent: Mutt/1.5.13 (2006-08-11)

On Mon, Jul 28, 2008 at 03:25:00PM -0400, Chris Knadle wrote:
> On Monday 28 July 2008, Felix Zielcke wrote:
> > Am Montag, den 28.07.2008, 14:41 -0400 schrieb Chris Knadle:
> > >    However on the last test I did make an error and left out the -d
> > > option to grub-probe, and that's required for the grub-probe to succeed,
> > > so unfortunately the output I posted is erroneous.
> > >    A new one is attached which has Robert's patch applied -- it does
> > > succeed in finding the partition, but unfortunately we can't fix the
> > > problem this way because I believe it makes Apple partition detection
> > > *always* fail.
> >
> > Urgs, yeah didn't see that.
> > You have to use -d if you give a device.
> > Why do you think that with this it will always fail?
>    Because the test that the patch does is to check for an HFS+ filesystem 
> magic number against the first 2 bytes on the drive, which contains a jump 
> vector for the Grub stage1 binary.  i.e. in order for the test to pass, Grub 
> has to be unbootable.

My check has nothing to do with HFS+, it's based on the header magic number
(0x4552), which differs from the partition magic (0x504D) but also from the
HFS+ magic (0x482B, 0x4858).

Please could you test it against an apple partmap?

Robert Millan

  The DRM opt-in fallacy: "Your data belongs to us. We will decide when (and
  how) you may access your data; but nobody's threatening your freedom: we
  still allow you to remove your data and not access it at all."

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