[uds-announce] Dual Boot Installation with Ubuntu

[Seth Forshee]

On Tue, Oct 30, 2012 at 08:27:18PM +0100, Göran Gustafsson wrote:
> Yes, Apple doesn't fully follow the specs. I've read that they use a mix of version 1 and 2.

I think this is basically right. Mac firmware is based off of an older
EFI 1.x version but has some features from newer 2.x versions.

> From my experience you can only boot if the file is named EFI/boot/bootx64.efi. Otherwise you can't see the option when holding down the option key at boot.

Or else the bootloader needs to be installed in the HFS+ partition and
blessed.

> On 2012-10-30, at 17:56, Colin Watson <cjwatson at ubuntu.com> wrote:
> 
> > On Mon, Oct 29, 2012 at 06:24:26PM +0100, Göran Gustafsson wrote:
> >> If you are trying to boot using grub2 and EFI (without using refit and
> >> a hybrid mbr partition table) then you need to make sure you got a
> >> file named EFI/boot/bootx64.efi on /dev/sda1. Ubuntu drops the ball on
> >> this one.
> > 
> > Per the spec, /EFI/boot/bootx64.efi is only supposed to be required for
> > booting from removable media.  For fixed disks, it is supposed to be
> > sufficient to have /EFI/ubuntu/grubx64.efi plus an efibootmgr entry.
> > 
> > However, Macbooks are probably hopelessly non-compliant with the UEFI
> > spec ...
> > 
> > -- 
> > Colin Watson                                       [cjwatson at ubuntu.com]
> > 
> > -- 
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