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Re: Linux Wheezy just compiled 3.2.65 kernel does not see UUID of my 1st partition anymore.

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On Monday 23 February 2015 20:30, Pim conveyed the following to 
comp.os.linux.misc...

> Le Mon, 23 Feb 2015 19:43:54 +0100,
>  Aragorn <thorongil@telenet.be.invalid> disait ceci :
>
>> On Monday 23 February 2015 19:32, Pim conveyed the following to
>> comp.os.linux.misc...
>>
>>> Le Mon, 23 Feb 2015 18:37:33 +0100,
>>>  Aragorn <thorongil@telenet.be.invalid> disait ceci :
>>>
>>>> On Monday 23 February 2015 15:18, Pim conveyed the following to
>>>> comp.os.linux.misc...
>>>>
>>>>> [...]
>>>>> I'm on Debian wheezy and i just compile a knew kernel comming from
>>>>> debian Distribution. In fact it is the last dpkg update kernel
>>>>> source for the stable wheezy.
>>>>> 
>>>>> uname -a gives:
>>>>> Linux Amd64 3.2.65 #1 SMP Mon Feb 16 22:04:41 CET 2015 x86_64
>>>>> GNU/Linux
>>>>> 
>>>>> Unfortunately it does not sees my root partition / if I tell grub2
>>>>> to search it by UUID.
>>>>> 
>>>>> [...]
>>>>> On boot i have a message like:
>>>>> blkid : cannot find UUID=xxxxx or something like that when booting
>>>>> by /dev/sdb5 : possibly that uuid is red in /etc/fstab.
>>>>> But trying to boot with uuid give a kernel panic
>>>>> unable to boot on (0,0) or something like that.
>>>>> Note also the i did compile kernel WITHOUT initrd.
>>>>>
>>>>> [...]
>>>>
>>>> That last quoted line above says it all.  The kernel does not by
>>>> itself support UUIDs or LABELs.  If you want to boot a kernel while
>>>> using a UUID or a LABEL in your grub.cfg or at the kernel boot
>>>> line, then you'll need to create an initramfs.
>>> 
>>> Thank's for reply.
>>> Ok.
>>> Could you explain me why that please : how does it work?
>>
>> I'm not sure exactly, but I believe that the interpretation of UUIDs
>> and LABELs is done in userspace, normally, so at boot time, the
>> kernel doesn't have any idea what those UUIDs or LABELs are.  The
>> initramfs however contains the tools needed for the interpretation
>> ??? most notably, udev (now part of systemd).
   ^^^

Apparently you are using a version of slrn without UTF-8 support. :-)

(P.S.: Please tell your newsreader to drop the signature of the poster 
to whom you are replying.)

> Thank's for reply.
> 
> I don't know myself but i think it is just that /dev filesystem must
> be mounted and the uuid can be found in /dev/disks/by-uuid/xxx

That too is part of the problem.

> Sorry but this entry :
> 
> title           Debian GNU/Linux, kernel 2.6.26 (single-user mode)
> root            (hd0,0)
> kernel          /vmlinuz-2.6.26
> root=UUID=93dbe8dc-adf2-4dbe-b001-fd65006d568d ro single
> 
> comes from and old kernel of mine i compiled without initrd
> the file is menu.lst, means grub1 and i remember it booted very well.
> 
> So why should not it work too with a recent kernel 3.xxx?

Did you enable devtmpfs support in your new kernel and told it to mount 
the devtmpfs at boot?

> I liked this kind of conf because it is very thin et very efficient.
> 
> I don't like heavy things.

I understand, but the initramfs/initrd doesn't necessarily complicate 
things.  You can easily create one with mkinitrd and it is dropped from 
memory once the kernel has fully booted, so it's not taking up any idle 
RAM.

-- 
= Aragorn =

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Linux Wheezy just compiled 3.2.65 kernel does not see UUID of my 1st partition anymore. Pim <moi@free.fr> - 2015-02-23 14:18 +0000
  Re: Linux Wheezy just compiled 3.2.65 kernel does not see UUID of my 1st partition anymore. Aragorn <thorongil@telenet.be.invalid> - 2015-02-23 18:37 +0100
    Re: Linux Wheezy just compiled 3.2.65 kernel does not see UUID of my 1st partition anymore. Pim <moi@free.fr> - 2015-02-23 18:32 +0000
      Re: Linux Wheezy just compiled 3.2.65 kernel does not see UUID of my 1st partition anymore. Aragorn <thorongil@telenet.be.invalid> - 2015-02-23 19:43 +0100
        Re: Linux Wheezy just compiled 3.2.65 kernel does not see UUID of my 1st partition anymore. Pim <moi@free.fr> - 2015-02-23 19:30 +0000
          Re: Linux Wheezy just compiled 3.2.65 kernel does not see UUID of my 1st partition anymore. Aragorn <thorongil@telenet.be.invalid> - 2015-02-24 09:08 +0100
      Re: Linux Wheezy just compiled 3.2.65 kernel does not see UUID of my 1st partition anymore. "David W. Hodgins" <dwhodgins@nomail.afraid.org> - 2015-02-23 17:50 -0500
        Re: Linux Wheezy just compiled 3.2.65 kernel does not see UUID of my 1st partition anymore. Pim <moi@free.fr> - 2015-02-24 02:41 +0000
          Re: Linux Wheezy just compiled 3.2.65 kernel does not see UUID of my 1st partition anymore. "David W. Hodgins" <dwhodgins@nomail.afraid.org> - 2015-02-24 01:29 -0500
            Re: Linux Wheezy just compiled 3.2.65 kernel does not see UUID of my 1st partition anymore. Pim <moi@free.fr> - 2015-02-24 18:32 +0000
            Re: Linux Wheezy just compiled 3.2.65 kernel does not see UUID of my 1st partition anymore. Jerry Peters <jerry@example.invalid> - 2015-02-24 21:16 +0000
    Re: Linux Wheezy just compiled 3.2.65 kernel does not see UUID of my 1st partition anymore. Pascal Hambourg <boite-a-spam@plouf.fr.eu.org> - 2015-02-27 21:47 +0100
      Re: Linux Wheezy just compiled 3.2.65 kernel does not see UUID of my 1st partition anymore. Pim <moi@free.fr> - 2015-02-27 23:43 +0000
      Re: Linux Wheezy just compiled 3.2.65 kernel does not see UUID of my 1st partition anymore. Aragorn <thorongil@telenet.be.invalid> - 2015-02-28 00:44 +0100
        Re: Linux Wheezy just compiled 3.2.65 kernel does not see UUID of my 1st partition anymore. Pascal Hambourg <boite-a-spam@plouf.fr.eu.org> - 2015-02-28 14:29 +0100
          Re: Linux Wheezy just compiled 3.2.65 kernel does not see UUID of my 1st partition anymore. Aragorn <thorongil@telenet.be.invalid> - 2015-02-28 21:10 +0100
            Re: Linux Wheezy just compiled 3.2.65 kernel does not see UUID of my 1st partition anymore. Pascal Hambourg <boite-a-spam@plouf.fr.eu.org> - 2015-03-01 10:40 +0100

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