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.
Thanks,
-wes
----- Original Message ----- From: "Wes James" comptekki@gmail.com To: "CentOS mailing list" centos@centos.org Sent: Saturday, 23 November, 2013 12:03:15 PM Subject: [CentOS] Finally.... CentOS on iMac core 2
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.
Thanks,
-wes _______________________________________________ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
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.
On Sun, Nov 24, 2013 at 5:59 PM, Philip Manuel phil@zomojo.com wrote:
----- Original Message ----- From: "Wes James" comptekki@gmail.com To: "CentOS mailing list" centos@centos.org Sent: Saturday, 23 November, 2013 12:03:15 PM Subject: [CentOS] Finally.... CentOS on iMac core 2
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.
Thanks,
-wes
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?
Thanks,
-wes
On 11/25/2013 08:22, Wes James wrote:
Oh. OK. I didn't realize CentOS wasn't using grub2. Are there any plans for CentOS to move to grub2?
No. Upstream uses grub1, so CentOS uses grub1.
Presumably RHEL7 will use grub2, but there's no good reason to hold your breath waiting for it.
On 11/25/2013 09:10, Warren Young wrote:
On 11/25/2013 08:22, Wes James wrote:
Oh. OK. I didn't realize CentOS wasn't using grub2. Are there any plans for CentOS to move to grub2?
No. Upstream uses grub1, so CentOS uses grub1.
Presumably RHEL7 will use grub2, but there's no good reason to hold your breath waiting for it.
Some research confirms this. Source [1] says Fedora 16+ uses Grub2, and Source [2] says RHEL 7 will be based on Fedora 19.
[1] https://en.wikipedia.org/wiki/Grub_2 [2] https://en.wikipedia.org/wiki/Rhel#cite_ref-18
Sorry, Marc. Better get used to Grub 2.
On 11/25/2013 09:10, Warren Young wrote:
Presumably RHEL7 will use grub2,
Confirmed: http://goo.gl/hfwtqF
Wes James wrote:
On Sun, Nov 24, 2013 at 5:59 PM, Philip Manuel phil@zomojo.com wrote:
From: "Wes James" comptekki@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?
a) Not unless or until upstream goes that way. b) I dealt with grub2 while fighting an FC19 workstation (that I wound up moving to CentOS). *G*R*U*B*2* MUST DIE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
mark
Am 25.11.2013 um 16:22 schrieb Wes James comptekki@gmail.com:
On Sun, Nov 24, 2013 at 5:59 PM, Philip Manuel phil@zomojo.com wrote:
From: "Wes James" comptekki@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.).
-- LF
On 14/12/13 14:14, Leon Fauster wrote:
Am 25.11.2013 um 16:22 schrieb Wes James comptekki@gmail.com:
On Sun, Nov 24, 2013 at 5:59 PM, Philip Manuel phil@zomojo.com wrote:
From: "Wes James" comptekki@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.).
-- LF
I've installed CentOS 6.x on an iMac Core2Duo in the past : http://arrfab.net/blog/?p=315 (basically involving having rEfit installed/configured)
Cheers,
-
Fabian Arrotin -
Leon Fauster -
m.roth＠5-cent.us -
Philip Manuel -
Warren Young -
Wes James