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xen-users
Re: [Xen-users] Warning: unable to open an initial console
Aaron // LT wrote:
I am very sorry for this nonsense... this was my first attempt at
using CentOS 4.1 with Xen. The reason for the error was the udev issue
(as explained for FedoraCore 3) in the wiki. Perhaps I should add some
lines there... ?
So the problem was solved by:
mkinitrd --builtin=ata_piix /boot/initrd-2.6.12.3-xen0.img 2.6.12.3-xen0
and adding the initrd to the grub configuration.
Thanks, did that get it working for you? I'm guessing its the SCSI
controller which is causing the problems, I'll see if I can do a similar
step for the SCSI controller...
Yes, it worked for me. Short explaination:
Similar to what is described here, the problem is udev:
http://wiki.xensource.com/xenwiki/XenFaq#head-ea8b39d71e49cc16d287257de4c482f99d883097
Before udev is started, /dev/console, /dev/null etc. do not exist in the
root file system. The solution is to use an initial ram disk that
contains these entries.
To create an initrd for the xen kernels do:
cd /lib/modules # look for the correct kernel version
depmod 2.6.12.3-xen0 # create module dependencies if missing
# create the initrd image
mkinitrd /boot/initrd-2.6.12.3-xen0.img 2.6.12.3-xen0
If mkinitrd complains that it can't find a specific module (from
/etc/modules.conf), and you know that it is compiled into the kernel
directly, you can tell mkinitrd so. E.g. for the ata_piix module:
mkinitrd --builtin=ata_piix /boot/initrd-2.6.12.3-xen0.img 2.6.12.3-xen0
Then add an additional line to the grub.conf file for the correct kernel:
module /initrd-2.6.12.3-xen0.img
or module /boot/initrd-2.6.12.3-xen0.img if you don't have a boot partition.
Hope that helps. With this additional step, both Xen 2.0.7 and the
latest unstable builds work well on this hardware with CentOS 4.1.
Best Regards,
Michael Paesold
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