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Re: [PATCH] Skip Apple ghosts

From: Andrey Borzenkov
Subject: Re: [PATCH] Skip Apple ghosts
Date: Tue, 07 Jan 2014 22:20:30 +0400

В Вт, 24/12/2013 в 14:26 +0100, Vladimir 'φ-coder/phcoder' Serbinenko
> Hello, all. It was discovered that on macs sometimes firmware defines
> ghost disks with vendor suffix. E.g.
> /ACPI(a0341d0,0)/PCI(2,1f)/UnknownMessaging(12)/EndEntire
> is a normal disks with partitions presented with HD(...) but then
> /ACPI(a0341d0,0)/PCI(2,1f)/UnknownMessaging(12)/MediaVendor(Apple)[0:
> ]/EndEntire
> is a ghost disk. It has as suffix a vendor path with empty vendor data.
> This is a problem because when chainloading on such disks GRUB can't
> find handle of partition as none is defined. I propose to dkip ghosts
> completely. This should be safe as the skip happens only for empty Apple
> vendor suffix and if the parent is already a known disk.
> Did anyone see anything similar?

Yes (on MacBook Pro); 

Here is what I get when EFI-booting from GRUB rescue CD made with single
x86_64-efi target:

simple FS
simple FS

The three HD media paths are for three Apple partitions (and the third
one has simple FS because it does contains HFS+). And I /think/ that the
very first Vendor media path refers to CD-ROM (based on the fact that it
got simple FS protocol). I played a bit with it; when I try to list
filesystem for this media path in EFI shell, it audibly tries to access
CD-ROM but fails. May be it requires Apple ISO9660 extensions, but I do
not know how to create EFI bootable image containing Apple extensions
(mkisofs should support it, but I was lost in arguments. xorriso
apparently does not support Apple extensions).

In your case you have SATA DVD drive, right? And path shown refers to

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