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mauricev
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Joined: 22 Mar 2004
Posts: 205
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 Posted: Mon Mar 23, 2009 12:05 am Post subject: [SOLVED] Kernel lies about not finding a valid root device |
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I'm trying to boot from a USB flash drive and it works so long as I manually enter the device designation.
That is, on its own, the kernel complains
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Activating mdev
Determining root device...
!! Could not find the root block device LABEL=root.
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Now where it says
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Please specify another value or: press Enter of the same, type "shell" for a shell, or "q" to skip...
root block device(LABEL=root) ::
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I just type LABEL=root and it works!
So it's as if the kernel had been lying and it did find it.
Here's the kernel line:
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title=Gentoo Linux 2.6.29-rc8-tip
root (hd0,0)
kernel /xen.gz
module /kernel-genkernel-x86_64-2.6.29-rc8-tip root=/dev/ram0 init=/linuxrc ramdisk=8192 real_root=LABEL=root doscsi rootdelay=30
module /initramfs-genkernel-x86_64-2.6.29-rc8-tip
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I had been trying this with real device designations (i.e., /dev/sdb2) and switched to the labels to see if that would help, which obviously it didn't. I also thought it could be an issue with the USB device not being ready, but rootdelay=30 didn't make a difference.
The kernel is a dom0-privileged kernel running under Xen.
Last edited by mauricev on Mon Mar 23, 2009 7:00 pm; edited 1 time in total |
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mamac
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Joined: 29 Feb 2004
Posts: 890
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| Posted: Mon Mar 23, 2009 2:16 pm Post subject: |
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Ha...isn't it this "delay" argument you should pass to load the kernel? I had such an issue but unfortunately I can't remember the argument sorry.
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mamac
l33t
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| Posted: Mon Mar 23, 2009 2:17 pm Post subject: |
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Ha ! Isn't it rootdelay argument?
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Kobboi
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Joined: 29 Jul 2005
Posts: 673
Location: Belgium
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| Posted: Mon Mar 23, 2009 2:26 pm Post subject: Re: Kernel lies about being not finding a valid root device |
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| mauricev wrote: |
That is, on its own, the kernel complains
| Code: |
Activating mdev
Determining root device...
!! Could not find the root block device LABEL=root.
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Also note that it's not the kernel talking, but the init script in the initrd. |
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mauricev
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Joined: 22 Mar 2004
Posts: 205
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| Posted: Mon Mar 23, 2009 6:59 pm Post subject: rootdelay is deprecated; scandelay is the correct parameter |
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| Quote: | | Also note that it's not the kernel talking, but the init script in the initrd. |
This was helpful.  The actual init script is /usr/share/genkernel/defaults/linuxrc. Once I looked inside it, I see the problem.
| Quote: | | Isn't it rootdelay argument? |
Not anymore! Apparently, at some point, someone changed it to scandelay.
Now, with scandelay it's booting fine. |
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