Somebody could correct me, but if the installed Centos install is on a ext4 file system, then the installed version of grub needs to support it. Which version of grub are you running and from which distro?

- Rilindo Foster http://monzell.com http://www.linkedin.com/pub/rilindo-foster/2/b32/43b

On Dec 4, 2011, at 11:53 PM, Always Learning centos@u61.u22.net wrote:

...

Despite using the usually successful methods of booting into another operating system from C 5.7, I can't get into C 6.0

Tried:-

title C6-0 (2.6.32-71.el6.x86_64)

rootnoverify (hd0,6) chainloader +1

and

root (hd0,6) kernel /boot/vmlinuz-2.6.32-71.el6.x86_64 ro root=UUID=67c62872-0c69-451c-8412-3c218c0d2cb0 rd_NO_LUKS rd_NO_LVM rd_NO_MD rd_NO_DM LANG=en_US.UTF-8 SYSFONT=latarcyrheb-sun16 KEYBOARDTYPE=pc KEYTABLE=uk initrd /boot/initramfs-2.6.32-71.el6.x86_64.img

The GRUB error is:-

13 : Invalid or unsupported executable format

This error is returned if the kernel image being loaded is not recognized as Multiboot or one of the supported native formats (Linux zImage or bzImage, FreeBSD, or NetBSD).

Bewildered.

Paul.

---

CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos

On Mon, 2011-12-05 at 10:05 -0500, Rilindo Foster wrote:

............. Which version of grub are you running and from which distro?

Distro = C 5.7

Regrettably the command:

grub --version

yields:-

grub (GNU GRUB 0.97)

But this is insufficient information because it does not reveal minor version numbers.

In a posting from Centos earlier this year, which I found last night but can't find again, the writer Bob? says that Grub since version 0.97.b.b in 2009 has been Ext4 aware, but the Grub in Centos 5.x, version 0.97.a.a, is not Ext4 aware.

I re-installed C 6.0 on a Ext3 partition and was able to launch it from the Grub menu on C 5.7 using

title C6-0 (2.6.32-71.el6.x86_64) rootnoverify (hd0,6) chainloader +1

Thank you for your help.

Vreme: 12/06/2011 01:42 PM, Always Learning piše:

On Mon, 2011-12-05 at 10:05 -0500, Rilindo Foster wrote:

...

............. Which version of grub are you running and from which distro?

Distro = C 5.7

Regrettably the command:

     grub --version

yields:-

     grub (GNU GRUB 0.97)

But this is insufficient information because it does not reveal minor version numbers.

In a posting from Centos earlier this year, which I found last night but can't find again, the writer Bob? says that Grub since version 0.97.b.b in 2009 has been Ext4 aware, but the Grub in Centos 5.x, version 0.97.a.a, is not Ext4 aware.

I re-installed C 6.0 on a Ext3 partition and was able to launch it from the Grub menu on C 5.7 using

title C6-0 (2.6.32-71.el6.x86_64) rootnoverify (hd0,6) chainloader +1

Thank you for your help.

************************ INCIDENTALLY ******************************

On partition 5 on the same disk, I have Ubuntu 11.4 (the latest version). That partition is formatted as Ext4 as confirmed by GParted 0.4.8 running on C 5.7

Guess what ?

I can launch Ubuntu using the same Grub menu on C 5.7 using:-

title Ubuntu 11.04 (chain) (2.6.38-8) rootnoverify (hd0,4) chainloader +1

If the problem is genuinely Grub's, on C 5.7, lack of understanding of Ext4 on which I installed C 6.0, then why does this ''problem'' not adversely affect and prevent me using the same Grub memu on C 5.7, and the same boot commands, starting Ubuntu ????

It suggests, the problem lies with C 6.0 and ***NOT*** with Grub on C 5.7. My guess is a bug in C 6.0's Grub implementation is failing to accept anything coming from a Grub 1 (the Grub used on C 5.7) environment. The pertinent point is, if Ubuntu 11.4 works why not C 6.0 ?

If Ext4 was the culprit you would get following error:

17 : Cannot mount selected partition This error is returned if the partition requested exists, but the filesystem type cannot be recognized by GRUB.

(from http://www.linuxselfhelp.com/gnu/grub/html_chapter/grub_13.html)

Instead, GRUB complained about kernel image.

I still think it was something else, not Ext4.

I looked on my main system and there I had separate HDD so I will not insist that C5.7 can boot from Ext4 until i check my notebook.