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creaker
l33t
Joined: 14 Jul 2012
Posts: 651
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 Posted: Wed Jan 01, 2014 2:58 pm Post subject: [Solved] Kernel complains about root partition |
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Hi!
I have two kernels, both built upon 3.10.17 sources. I built first kernel, checked if it bootable and saved it as kernel-old. After that I did some tweaks on .config file and built the second kernel (named kernel-3.10.17-gentoo). This kernel refuses to boot, I getting a message that the correct root= parameter should be added to command line. Grub menuentry:
| Code: | menuentry 'Gentoo /dev/sda2' --class gnu-linux --class gnu --class os $menuentry_id_option 'osprober-gnulinux-simple-1143bfad-e50d-43e4-9c01-eb8b857bf091' {
insmod part_msdos
insmod ext2
set root='hd0,msdos2'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos2 --hint-efi=hd0,msdos2 --hint-baremetal=ahci0,msdos2 1143bfad-e50d-43e4-9c01-eb8b857bf091
else
search --no-floppy --fs-uuid --set=root 1143bfad-e50d-43e4-9c01-eb8b857bf091
fi
linux /boot/kernel-3.10.17-gentoo root=/dev/sda2
} |
if I replacing "kernel-3.10.17-gentoo" in menu with "kernel-old", system boots fine.
I do not know which changes leads to producing unbootable kernel. I did these changes on .config file:
1. Removed support for initramfs
2. Enabled optimizing for minimal kernel size
3. Some processor related changes (NUMA, timers, cgroups)
Most likely kernel refuses to find root partition due to first two changes.
How do I fix this problem without enabling initramfs and disabling size optimization?
I tried to replace root=/dev/sda2 with root=<UUID> but it doesn't helped.
Also I tried real_root=/dev/sda2 and root=UUID=<UUID>.
Last edited by creaker on Wed Jan 01, 2014 6:05 pm; edited 1 time in total |
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John R. Graham
Administrator
Joined: 08 Mar 2005
Posts: 10727
Location: Somewhere over Atlanta, Georgia
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| Posted: Wed Jan 01, 2014 3:16 pm Post subject: |
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It's likely that your root partition file system support is built as a module that was being loaded in the initramfs. Change it to be built in and you should be good to go (or at least on to the next issue  ).
- John
_________________
I can confirm that I have received between 0 and 499 National Security Letters. |
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creaker
l33t
Joined: 14 Jul 2012
Posts: 651
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| Posted: Wed Jan 01, 2014 6:04 pm Post subject: |
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Yes, it really i2c_i801 marked with <m> and built as module. I built it into kernel and now I've booted.
Many thanks |
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