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Re: grub-efi with latest mac mini
From: |
Chris Murphy |
Subject: |
Re: grub-efi with latest mac mini |
Date: |
Fri, 8 Jun 2012 18:56:58 -0600 |
On Jun 8, 2012, at 1:18 PM, Vladimir 'φ-coder/phcoder' Serbinenko wrote:
> It doesn't mean that it's forced, more of unpopular.
It's forced if you want firmware updates.
>
>>
>>> Also Mac OS doesn't use EFI system partition other than
>>> for firmware updates.
>>
>> Unclear. All Apple computers with Mac OS X running, have an identical
>> Firmware.scap file installed to the EFI System partition.
>
> Ok, idk what this file is for.
I'm thinking it's CSM related because it contains references to BIOS.
>
>>> You mix again 2 things: you can boot in BIOS mode (CSM) on pure GPT as
>>> well. Windows is an exception since Microsoft pretends that possible is
>>> impossible.
>>
>> False. Apple's CSM will not activate unless the following three things are
>> true:
>
> Have you tried to forcibly activate it with appleloader GRUB command?
You mean from GRUB2-EFI? No. If you mean GRUB2 (for BIOS), I get nowhere near
GRUB if any of those three things are not true. Apple's EFI simply fails to see
the disk as valid for anything other than Mac OS X, or totally invalid if there
is no Mac OS X.
It seems the sequence is Apple's EFI scans the disk for those three things, and
only then activates the CSM, which then executes the first 440 bytes of the
MBR. I don't know if the CSM has a dependency on an active flag or not, or if
it just blindly executes those 440 bytes.
Chris Murphy
- RE: FW: grub-efi with latest mac mini, (continued)
- RE: FW: grub-efi with latest mac mini, John Frankish, 2012/06/21
- RE: FW: grub-efi with latest mac mini, John Frankish, 2012/06/22
- Re: grub-efi with latest mac mini, irrational John, 2012/06/08
- Re: grub-efi with latest mac mini, Chris Murphy, 2012/06/08
- Re: grub-efi with latest mac mini, Vladimir 'φ-coder/phcoder' Serbinenko, 2012/06/08
- Re: grub-efi with latest mac mini, Seth Goldberg, 2012/06/08
- Re: grub-efi with latest mac mini, Chris Murphy, 2012/06/08
- Re: grub-efi with latest mac mini, Seth Goldberg, 2012/06/08
- Re: grub-efi with latest mac mini, Chris Murphy, 2012/06/08
- Re: grub-efi with latest mac mini, Vladimir 'φ-coder/phcoder' Serbinenko, 2012/06/08
- Re: grub-efi with latest mac mini,
Chris Murphy <=
- Re: grub-efi with latest mac mini, Georg Wicherski, 2012/06/08
- Re: grub-efi with latest mac mini, Chris Murphy, 2012/06/08
- Re: grub-efi with latest mac mini, Georg Wicherski, 2012/06/09
- Re: grub-efi with latest mac mini, Chris Murphy, 2012/06/09
- Re: grub-efi with latest mac mini, Georg Wicherski, 2012/06/09
- Re: grub-efi with latest mac mini, Chris Murphy, 2012/06/09
- Re: grub-efi with latest mac mini, Georg Wicherski, 2012/06/09
- Re: grub-efi with latest mac mini, Chris Murphy, 2012/06/10