[lfs-support] Kernel panic: VFS: unable to mount root fs

Bruce Dubbs bruce.dubbs at gmail.com
Sun May 15 18:20:52 PDT 2016

Ken Moffat wrote:
> On Sun, May 15, 2016 at 03:46:02PM -0400, Nathan Bibb wrote:
>> On Sun, May 15, 2016 at 3:37 PM, Bruce Dubbs <bruce.dubbs at gmail.com> wrote:
>> If we are relatively confident that 'make defconfig' should boot, and I get
>> the same issue, I am thinking that we can narrow down the issue to how
>> Debian constructs the GRUB entry when using 'update-grub' from the host.
>> Does that sound reasonable, or is there something I'm missing?
> Bruce is confident because it works on his hardware :)

Well it works on a 2005 version of a P6.  We get into really old territory 
when we are talking about a 'pentium -mmx'.  Marketed between 1993 and 
1999.  That's millennia in computer time.  It really is last century.

   -- Bruce

On older, or
> different, machines the defaults might not be adequate - e.g. almost
> everything which has been separated in the last few years will
> default to N.
> There are two issues here -
> 1. The grub entry that you let debian create.  From time to time I
> have let debian-derived distros keep /boot, but since I did not
> intend to keep debian I edited grub.cfg myself.  What we do not know
> is what that generated debian entry looks like : it might have
> oddities - please consider posting it if the suggestion below does
> not help.
> 2. The kernel config.  I strongly suggest that you rerun 'make
> menuconfig' in chroot, and check whether ALL of the likely libata
> drivers have been selected.  lspci and google will help identify
> which drivers your motherboard needs.  If you need to change the
> config, rebuild in chroot and then copy (from debian) the bzImage
> onto the previous LFS kernel.
> ĸen

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