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Re: macbook EFI experiences

From: Isaac Dupree
Subject: Re: macbook EFI experiences
Date: Sat, 31 May 2008 17:46:16 -0400
User-agent: Thunderbird (X11/20080505)

Robert Millan wrote:
On Sat, May 31, 2008 at 02:57:21PM -0400, Isaac Dupree wrote:
You're confusing BIOS-based boot with msdos partition labels.  You can use
GPT just fine when booting from BIOS (although Intel tries to hide that
fact by embedding the GPT spec inside the EFI spec).
I have the hack which combines the two partition labels so I have both GPT and msdos labels. Which means that my first four partitions (only) are listed in msdos, and GPT is the really accurate one that MacOS and Linux use.

I'm not sure if this would confuse GRUB partition-wise.  Can it access all

yes, I was booting from the fifth partition for a while -- grub just needs the gpt module while running, obviously. That disk layout is a standard hack, there are tools for it named e.g. "gptsync" that the rEFIt guys mention/include.

However, I can't find a way to get into bootloader-land via BIOS without going through the msdos partitioning mechanism.

grub-setup may, too, be confused by this hack.  Saving that, you should be
able to install GRUB in MBR following the normal procedure, without any
need for msdos-style partition table (other than the dummy 0xee one).

Would be nice if you can verify GRUB works in both situations.

I bet it works fine that way too -- but I don't really have any way to get back to having just one dummy msdos-partition without wiping my disk, as far as I know.


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