Unable to mount root fs on unknown-block(8,10)
hi. i've just completed the lfs and am going through the blfs and this is the first problem i have had (albeit a big problem :p).
i used ubuntu 10.10 as a host (which i'm on now). i added the entry for my lfs by running a "grub-update" in my ubuntu (home) system. it added the entry but when i load it i get the error kernel panic unable to mount root fs on unknown-block(8,10) here is a list of partitions root@helen-ubunntu:~# fdisk -l Disk /dev/sda: 1000.2 GB, 1000204886016 bytes 255 heads, 63 sectors/track, 121601 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x8cdd4106 Device Boot Start End Blocks Id System /dev/sda1 1 25190 202334278 7 HPFS/NTFS /dev/sda2 * 25190 25203 102400 7 HPFS/NTFS /dev/sda3 25203 121602 774322177 5 Extended /dev/sda5 25203 49691 196701773 7 HPFS/NTFS /dev/sda6 49691 75188 204800000 83 Linux /dev/sda7 75188 76208 8192000 82 Linux swap / Solaris /dev/sda8 76208 77483 10240000 83 Linux /dev/sda9 77483 77610 1024000 82 Linux swap / Solaris /dev/sda10 77610 80160 20480000 83 Linux /dev/sda11 80160 80670 4096000 82 Linux swap / Solaris root@helen-ubunntu:~# here is the grub.cfg file located in /boot/grub # # DO NOT EDIT THIS FILE # # It is automatically generated by /usr/sbin/grub-mkconfig using templates # from /etc/grub.d and settings from /etc/default/grub # ### BEGIN /etc/grub.d/00_header ### if [ -s $prefix/grubenv ]; then load_env fi set default="0" if [ ${prev_saved_entry} ]; then set saved_entry=${prev_saved_entry} save_env saved_entry set prev_saved_entry= save_env prev_saved_entry set boot_once=true fi function savedefault { if [ -z ${boot_once} ]; then saved_entry=${chosen} save_env saved_entry fi } insmod ext2 set root='(hd0,10)' search --no-floppy --fs-uuid --set cf4aad78-b3e4-4018-b928-df8452caf488 set locale_dir=($root)/boot/grub/locale set lang=en insmod gettext set timeout=5 ### END /etc/grub.d/00_header ### ### BEGIN /etc/grub.d/10_linux ### menuentry "GNU/Linux, with Linux 2.6.37.2-lfs-6.8" --class gnu-linux --class gnu --class os { insmod ext2 set root='(hd0,10)' search --no-floppy --fs-uuid --set cf4aad78-b3e4-4018-b928-df8452caf488 echo Loading Linux 2.6.37.2-lfs-6.8 ... linux /boot/vmlinux-2.6.37.2-lfs-6.8 root=/dev/sda10 ro } menuentry "GNU/Linux, with Linux 2.6.37.2-lfs-6.8 (recovery mode)" --class gnu-linux --class gnu --class os { insmod ext2 set root='(hd0,10)' search --no-floppy --fs-uuid --set cf4aad78-b3e4-4018-b928-df8452caf488 echo Loading Linux 2.6.37.2-lfs-6.8 ... linux /boot/vmlinux-2.6.37.2-lfs-6.8 root=/dev/sda10 ro single } ### END /etc/grub.d/10_linux ### ### BEGIN /etc/grub.d/30_os-prober ### menuentry "Windows 7 (loader) (on /dev/sda2)" { insmod ntfs set root='(hd0,2)' search --no-floppy --fs-uuid --set 52e21b18e21affc1 chainloader +1 } ### END /etc/grub.d/30_os-prober ### ### BEGIN /etc/grub.d/40_custom ### # This file provides an easy way to add custom menu entries. Simply type the # menu entries you want to add after this comment. Be careful not to change # the 'exec tail' line above. ### END /etc/grub.d/40_custom ### here is the same file in my ubuntu system # # DO NOT EDIT THIS FILE # # It is automatically generated by grub-mkconfig using templates # from /etc/grub.d and settings from /etc/default/grub # ### BEGIN /etc/grub.d/00_header ### if [ -s $prefix/grubenv ]; then set have_grubenv=true load_env fi set default="0" if [ "${prev_saved_entry}" ]; then set saved_entry="${prev_saved_entry}" save_env saved_entry set prev_saved_entry= save_env prev_saved_entry set boot_once=true fi function savedefault { if [ -z "${boot_once}" ]; then saved_entry="${chosen}" save_env saved_entry fi } function recordfail { set recordfail=1 if [ -n "${have_grubenv}" ]; then if [ -z "${boot_once}" ]; then save_env recordfail; fi; fi } function load_video { insmod vbe insmod vga } insmod part_msdos insmod ext2 set root='(hd0,msdos6)' search --no-floppy --fs-uuid --set 3de884c9-6859-4ef4-b298-69d15987fbab if loadfont /usr/share/grub/unicode.pf2 ; then set gfxmode=640x480 load_video insmod gfxterm fi terminal_output gfxterm insmod part_msdos insmod ext2 set root='(hd0,msdos6)' search --no-floppy --fs-uuid --set 3de884c9-6859-4ef4-b298-69d15987fbab set locale_dir=($root)/boot/grub/locale set lang=en insmod gettext if [ "${recordfail}" = 1 ]; then set timeout=-1 else set timeout=10 fi ### END /etc/grub.d/00_header ### ### BEGIN /etc/grub.d/05_debian_theme ### set menu_color_normal=white/black set menu_color_highlight=black/light-gray ### END /etc/grub.d/05_debian_theme ### ### BEGIN /etc/grub.d/10_linux ### menuentry 'Ubuntu, with Linux 2.6.35-30-generic-pae' --class ubuntu --class gnu-linux --class gnu --class os { recordfail insmod part_msdos insmod ext2 set root='(hd0,msdos6)' search --no-floppy --fs-uuid --set 3de884c9-6859-4ef4-b298-69d15987fbab linux /boot/vmlinuz-2.6.35-30-generic-pae root=UUID=3de884c9-6859-4ef4-b298-69d15987fbab ro quiet splash initrd /boot/initrd.img-2.6.35-30-generic-pae } menuentry 'Ubuntu, with Linux 2.6.35-30-generic-pae (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os { recordfail insmod part_msdos insmod ext2 set root='(hd0,msdos6)' search --no-floppy --fs-uuid --set 3de884c9-6859-4ef4-b298-69d15987fbab echo 'Loading Linux 2.6.35-30-generic-pae ...' linux /boot/vmlinuz-2.6.35-30-generic-pae root=UUID=3de884c9-6859-4ef4-b298-69d15987fbab ro single echo 'Loading initial ramdisk ...' initrd /boot/initrd.img-2.6.35-30-generic-pae } ### END /etc/grub.d/10_linux ### ### BEGIN /etc/grub.d/20_linux_xen ### ### END /etc/grub.d/20_linux_xen ### ### BEGIN /etc/grub.d/20_memtest86+ ### menuentry "Memory test (memtest86+)" { insmod part_msdos insmod ext2 set root='(hd0,msdos6)' search --no-floppy --fs-uuid --set 3de884c9-6859-4ef4-b298-69d15987fbab linux16 /boot/memtest86+.bin } menuentry "Memory test (memtest86+, serial console 115200)" { insmod part_msdos insmod ext2 set root='(hd0,msdos6)' search --no-floppy --fs-uuid --set 3de884c9-6859-4ef4-b298-69d15987fbab linux16 /boot/memtest86+.bin console=ttyS0,115200n8 } ### END /etc/grub.d/20_memtest86+ ### ### BEGIN /etc/grub.d/30_os-prober ### menuentry "GNU/Linux, with Linux 2.6.37.2-lfs-6.8 (on /dev/sda10)" { insmod part_msdos insmod ext2 set root='(hd0,msdos10)' search --no-floppy --fs-uuid --set cf4aad78-b3e4-4018-b928-df8452caf488 linux /boot/vmlinux-2.6.37.2-lfs-6.8 root=/dev/sda10 ro } menuentry "GNU/Linux, with Linux 2.6.37.2-lfs-6.8 (recovery mode) (on /dev/sda10)" { insmod part_msdos insmod ext2 set root='(hd0,msdos10)' search --no-floppy --fs-uuid --set cf4aad78-b3e4-4018-b928-df8452caf488 linux /boot/vmlinux-2.6.37.2-lfs-6.8 root=/dev/sda10 ro single } menuentry "Windows 7 (loader) (on /dev/sda2)" { insmod part_msdos insmod ntfs set root='(hd0,msdos2)' search --no-floppy --fs-uuid --set 52E21B18E21AFFC1 chainloader +1 } ### END /etc/grub.d/30_os-prober ### ### BEGIN /etc/grub.d/40_custom ### # This file provides an easy way to add custom menu entries. Simply type the # menu entries you want to add after this comment. Be careful not to change # the 'exec tail' line above. ### END /etc/grub.d/40_custom ### ### BEGIN /etc/grub.d/41_custom ### if [ -f $prefix/custom.cfg ]; then source $prefix/custom.cfg; fi ### END /etc/grub.d/41_custom ### i might be missing some relevant information, please let me know if thats the case :study: |
Hello!
It seems to me that grub is doing fine and I think I had the same problem a year ago, I suggest you place the bzImage into your root directory. Another suggestion is for you to check for errors in /etc/fstab, and could you $ cat /etc/fstab as well as $ sudo fdisk -l to a reply here? |
I dug around a bit more and I think it's not actually to do with grub2 at all but rather related to incorrect kernel config parameters. I think im lacking an ext2 file system driver, amongst other things. What are the correct parameters to pass to the kernel for compilation?
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Here is a nice how-to which I used to compile my kernel and I succeeded with that:
http://www.gentoo.org/doc/en/handbook/index.xml However I think that posting cat /etc/fstab as well as sudo fdisk -l of your maybe-soon-to-be-true gnu/LFS might pay for the effort. |
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thanks a lot White Tea Citrus.
nice user name btw :) |
Thank You
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