[CentOS] Finally.... CentOS on iMac core 2
leonfauster at googlemail.com
Sat Dec 14 13:14:59 UTC 2013
Am 25.11.2013 um 16:22 schrieb Wes James <comptekki at gmail.com>:
> On Sun, Nov 24, 2013 at 5:59 PM, Philip Manuel <phil at zomojo.com> wrote:
>> From: "Wes James" <comptekki at gmail.com>
>>> I've been trying several combinations of OSX, CentOS to try and get CentOS
>>> installed on an old iMac. I finally first installed OS X, then installed
>>> CentOS in the open space after OS X. With refit installed and selecting
>>> CentOS, it starts booting but get a screen that a boot device can't e
>>> found. So I then install Xubuntu with the option to replace OS X. After
>>> Xbuntu is installed and then do a reboot the grub screen comes up and I can
>>> now select CentOS and it will boot.
>>> Can someone explain why this is? I can't just install CentOS on the whole
>>> disk, as I get the blinking mac disk with question mark.
>> this is due I believe due to the partitioning scheme of the iMac, using
>> GPT, and as grub does not support GPT partitions. you have to use grub2.
>> Hence, why xubuntu works.
> Oh. OK. I didn't realize CentOS wasn't using grub2. Are there any plans
> for CentOS to move to grub2?
there exist a so called "Hybrid GPT/MBR partition table support" in "OSX -> cli tool diskutil"
that leads to the so called "BIOS compatibility" for booting.
rEFIt includes "Partition Inspector (native osx app)" that shows your GPT -> MBR sync status.
refit can do that "sync" also (in there prompt).
I could boot CentOS5 on a Intel Macbook two years ago (with grub1).
Alternative - compile Grub2 under OSX, install it under OSX, configure it to boot both (osx/linux), boot it.
Suggestion - use Grub2/EFI not because of the partition format but for better hw initialisation.
The BIOS compatibility mode (grub1/BIOS) is not doing his job correctly (e.g. ATI GFX Card support etc.).
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