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(Solved) Kernel panic at boot from CD to install GRUB.

https://forum.salixos.org/viewtopic.php?t=3334

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Re: Kernel panic at boot from CD to install GRUB.

Posted: 30. Mar 2012, 07:03
by globetrotterdk
Shador wrote:
globetrotterdk wrote:mkinitrd -u usb-storage
That's wrong syntax. Did you even consult the mkinird man page?
Actually, I did.
Shador wrote:I suggest something like this:

Code: Select all

mkinird -c -u -m usb-storage
But you need probably more than usb-storage. If you post the output of lsmod from the machine with the card reader attached, I might be able to give some hints. Also add the output of lspci -k.
Noted. Here is the output of lsmod:

Code: Select all

Module                  Size  Used by
snd_seq_dummy           1119  0 
snd_seq_oss            25900  0 
snd_seq_midi_event      4696  1 snd_seq_oss
snd_seq                42680  5 snd_seq_dummy,snd_seq_oss,snd_seq_midi_event
snd_seq_device          4505  3 snd_seq_dummy,snd_seq_oss,snd_seq
snd_pcm_oss            34554  0 
snd_mixer_oss          14726  1 snd_pcm_oss
ipv6                  236629  14 
ppdev                   4901  0 
parport_pc             18218  0 
lp                      7105  0 
parport                25627  3 ppdev,parport_pc,lp
fan                     1926  0 
i915                  360914  2 
snd_hda_codec_realtek   222970  1 
snd_hda_intel          18443  0 
snd_hda_codec          61720  2 snd_hda_codec_realtek,snd_hda_intel
drm_kms_helper         23927  1 i915
drm                   143202  3 i915,drm_kms_helper
snd_hwdep               4772  1 snd_hda_codec
i2c_algo_bit            4287  1 i915
thermal                 6718  0 
eeepc_laptop           12507  0 
ath5k                 129860  0 
snd_pcm                59843  3 snd_pcm_oss,snd_hda_intel,snd_hda_codec
processor              23158  0 
video                  10482  1 i915
rtc_cmos                7970  0 
rtc_core               11871  1 rtc_cmos
joydev                  7695  0 
intel_agp               9000  1 i915
snd_timer              15717  2 snd_seq,snd_pcm
ath                    11089  1 ath5k
sparse_keymap           2436  1 eeepc_laptop
thermal_sys            11426  4 fan,thermal,processor,video
rtc_lib                 1502  1 rtc_core
i2c_i801                7018  0 
intel_gtt              11414  3 i915,intel_agp
snd                    43891  11 snd_seq_oss,snd_seq,snd_seq_device,snd_pcm_oss,snd_mixer_oss,snd_hda_codec_realtek,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm,snd_timer
mac80211              181473  1 ath5k
battery                 8431  0 
atl2                   20719  0 
hwmon                   1065  2 eeepc_laptop,thermal_sys
psmouse                40986  0 
soundcore               4641  1 snd
ac                      2465  0 
button                  4005  1 i915
agpgart                23062  3 drm,intel_agp,intel_gtt
i2c_core               16421  5 i915,drm_kms_helper,drm,i2c_algo_bit,i2c_i801
cfg80211              122542  3 ath5k,ath,mac80211
snd_page_alloc          5957  2 snd_hda_intel,snd_pcm
serio_raw               3542  0 
output                  1456  1 video
rfkill                 13278  2 eeepc_laptop,cfg80211
evdev                   7303  17 
shpchp                 23205  0 
sg                     21511  0 
yenta_socket           19256  0 
pcmcia_rsrc             9344  1 yenta_socket
pcmcia                 32618  0 
pcmcia_core            10169  3 yenta_socket,pcmcia_rsrc,pcmcia
usbhid                 32435  0 
hid                    63771  1 usbhid
fuse                   58136  3 
squashfs               25647  6
The following is the output of lspci -k:

Code: Select all

00:00.0 Host bridge: Intel Corporation Mobile 915GM/PM/GMS/910GML Express Processor to DRAM Controller (rev 04)
	Subsystem: ASUSTeK Computer Inc. Device 82d9
	Kernel driver in use: agpgart-intel
	Kernel modules: intel-agp
00:02.0 VGA compatible controller: Intel Corporation Mobile 915GM/GMS/910GML Express Graphics Controller (rev 04)
	Subsystem: ASUSTeK Computer Inc. Device 82d9
	Kernel driver in use: i915
	Kernel modules: i915
00:02.1 Display controller: Intel Corporation Mobile 915GM/GMS/910GML Express Graphics Controller (rev 04)
	Subsystem: ASUSTeK Computer Inc. Device 82d9
00:1b.0 Audio device: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) High Definition Audio Controller (rev 04)
	Subsystem: ASUSTeK Computer Inc. Device 82a1
	Kernel driver in use: HDA Intel
	Kernel modules: snd-hda-intel
00:1c.0 PCI bridge: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) PCI Express Port 1 (rev 04)
	Kernel modules: shpchp
00:1c.1 PCI bridge: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) PCI Express Port 2 (rev 04)
	Kernel modules: shpchp
00:1c.2 PCI bridge: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) PCI Express Port 3 (rev 04)
	Kernel modules: shpchp
00:1d.0 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB UHCI #1 (rev 04)
	Subsystem: ASUSTeK Computer Inc. Device 82d8
	Kernel driver in use: uhci_hcd
00:1d.1 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB UHCI #2 (rev 04)
	Subsystem: ASUSTeK Computer Inc. Device 82d8
	Kernel driver in use: uhci_hcd
00:1d.2 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB UHCI #3 (rev 04)
	Subsystem: ASUSTeK Computer Inc. Device 82d8
	Kernel driver in use: uhci_hcd
00:1d.3 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB UHCI #4 (rev 04)
	Subsystem: ASUSTeK Computer Inc. Device 82d8
	Kernel driver in use: uhci_hcd
00:1d.7 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB2 EHCI Controller (rev 04)
	Subsystem: ASUSTeK Computer Inc. Device 82d8
	Kernel driver in use: ehci_hcd
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev d4)
00:1f.0 ISA bridge: Intel Corporation 82801FBM (ICH6M) LPC Interface Bridge (rev 04)
	Subsystem: ASUSTeK Computer Inc. Device 82d8
	Kernel modules: iTCO_wdt, intel-rng
00:1f.2 IDE interface: Intel Corporation 82801FBM (ICH6M) SATA Controller (rev 04)
	Subsystem: ASUSTeK Computer Inc. Device 82d8
	Kernel driver in use: ata_piix
00:1f.3 SMBus: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) SMBus Controller (rev 04)
	Subsystem: ASUSTeK Computer Inc. Device 82d8
	Kernel modules: i2c-i801
01:00.0 Ethernet controller: Atheros Communications Inc. AR5001 Wireless Network Adapter (rev 01)
	Subsystem: AzureWave AR5007EG 802.11bg Wi-Fi mini PCI express card
	Kernel driver in use: ath5k
	Kernel modules: ath5k
03:00.0 Ethernet controller: Atheros Communications L2 Fast Ethernet (rev a0)
	Subsystem: ASUSTeK Computer Inc. Device 8233
	Kernel driver in use: atl2
	Kernel modules: atl2
Shador wrote:Additionally you need to change /etc/fstab to use UUID= for all devices. Did you change this? Although this doesn't cause a kernel panic, it could cause troubles later.
I thought this could wait until I am actually able to boot from the system.
Shador wrote:This should add a initrd /boot/... line and change the kernel argument to root=UUID=...
Did you check the grub.cfg for this?
Yes, I checked. There is absolutely no content in grub.cfg.

Re: Kernel panic at boot from CD to install GRUB.

Posted: 30. Mar 2012, 20:52
by Shador
I could find nothing in that output. What kind of controller is this? Is it a USB one?
globetrotterdk wrote:I thought this could wait until I am actually able to boot from the system.
Just wanted to mention this, as you wouldn't get much further without changing this if you get past the kernel panic.
globetrotterdk wrote:Yes, I checked. There is absolutely no content in grub.cfg.
Sorry, but you're looking in the wrong place. What do you expect me to do? Look for /boot/grub/grub.cfg on all drives, open it with a text editor. I'm using geany or mousepad, but any should work. But as I can tell from the menu you're getting the file is obviously there. It might be in an unexpected location, if you messed up the installation.
Honestly, this is so obvious that I'm wondering why you don't try it yourself. It's not that hard to try to find a solution for such problems. If you don't want to. OK, fine, but I can't help you then. Of course, I could do the setup for you, but that's not my job and I don't want to do this for free. Actually that would be a much cheaper solution for my time, but not for your pocket. ;) Nevertheless, I've got absolutely no problem with helping people, who got stuck and thus sharing some of my experience. But I don't want this to be my project - I've got my own -, but this is yours.

Re: Kernel panic at boot from CD to install GRUB.

Posted: 30. Mar 2012, 21:51
by globetrotterdk
Shador wrote:I could find nothing in that output. What kind of controller is this? Is it a USB one?
As I have posted before, I have been unable to determine the controller due to a lack of documentation
Shador wrote:
globetrotterdk wrote:I thought this could wait until I am actually able to boot from the system.
Just wanted to mention this, as you wouldn't get much further without changing this if you get past the kernel panic.
Cheers.
Shador wrote:
globetrotterdk wrote:Yes, I checked. There is absolutely no content in grub.cfg.
Sorry, but you're looking in the wrong place. What do you expect me to do? Look for /boot/grub/grub.cfg on all drives, open it with a text editor. I'm using geany or mousepad, but any should work. But as I can tell from the menu you're getting the file is obviously there. It might be in an unexpected location, if you messed up the installation.
Honestly, this is so obvious that I'm wondering why you don't try it yourself. It's not that hard to try to find a solution for such problems. If you don't want to. OK, fine, but I can't help you then. Of course, I could do the setup for you, but that's not my job and I don't want to do this for free. Actually that would be a much cheaper solution for my time, but not for your pocket. ;) Nevertheless, I've got absolutely no problem with helping people, who got stuck and thus sharing some of my experience. But I don't want this to be my project - I've got my own -, but this is yours.
There is only one /boot/grub/grub.cfg. What makes me suspicious about the app to use for opening is that I also have a file called /boot/grub/grub.cfg.old.3992 with nothing in it. The only prompt I get for the file type is K3b, for starting a new file project. (I have the card at this time in an external card reader and am viewing the card on my desktop system, which is running Salix64 KDE 13.37.) I have tried opening the files in Kwrite and Kate, with no success, which would be similar to using Geany or Mousepad.

Edit:
Not really sure why the files are acting as they are on my system, but I finally managed to get the file open with vim:

Code: Select all

#
# 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 $prefix/grubenv ]; then
  load_env
fi
set default="${saved_entry}"
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 load_video {
  insmod vbe
  insmod vga
  insmod video_bochs
  insmod video_cirrus
}

insmod part_msdos
insmod ext2
set root='(hd1,msdos1)'
search --no-floppy --fs-uuid --set=root 8719a6da-67e4-491c-bc85-569798593ee4
if loadfont /usr/share/grub/unicode.pf2 ; then
  set gfxmode=auto
  load_video
  insmod gfxterm
  insmod part_msdos
  insmod ext2
  set root='(hd1,msdos1)'
  search --no-floppy --fs-uuid --set=root 8719a6da-67e4-491c-bc85-569798593ee4
  set locale_dir=($root)/boot/grub/locale
  set lang=en_US
  insmod gettext
fi
terminal_output gfxterm
insmod part_msdos
insmod ext2
set root='(hd1,msdos1)'
search --no-floppy --fs-uuid --set=root 8719a6da-67e4-491c-bc85-569798593ee4
insmod jpeg
background_image -m stretch /boot/grub/salix.jpg
set timeout=5
### END /etc/grub.d/00_header ###

### BEGIN /etc/grub.d/10_linux ###
menuentry 'Salix 13.37.0 GNU/Linux, with Linux 2.6.37.6-smp' --class salix --class gnu-linux --class gnu --class os {
	load_video
	set gfxpayload=keep
	insmod gzio
	insmod part_msdos
	insmod ext2
	set root='(hd1,msdos1)'
	search --no-floppy --fs-uuid --set=root 8719a6da-67e4-491c-bc85-569798593ee4
	echo	'Loading Linux 2.6.37.6-smp ...'
	linux	/boot/vmlinuz-huge-smp-2.6.37.6-smp root=/dev/sdc1 ro vt.default_utf8=1 quiet
}
menuentry 'Salix 13.37.0 GNU/Linux, with Linux 2.6.37.6-smp (recovery mode)' --class salix --class gnu-linux --class gnu --class os {
	load_video
	set gfxpayload=keep
	insmod gzio
	insmod part_msdos
	insmod ext2
	set root='(hd1,msdos1)'
	search --no-floppy --fs-uuid --set=root 8719a6da-67e4-491c-bc85-569798593ee4
	echo	'Loading Linux 2.6.37.6-smp ...'
	linux	/boot/vmlinuz-huge-smp-2.6.37.6-smp root=/dev/sdc1 ro single vt.default_utf8=1
}
### END /etc/grub.d/10_linux ###

### BEGIN /etc/grub.d/20_linux_xen ###
### END /etc/grub.d/20_linux_xen ###

### BEGIN /etc/grub.d/30_os-prober ###
### 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 would like to thank you for your help. I have appreciated it. Believe it or not, I have learned a lot of new things. I can imagine how this process has been irritating for you - you have expressed that fact on a number of occasions. So if you are tired of helping me, as you seem to be expressing, that is perfectly legitimate. Let's keep the comments at a civilized level and just go our separate ways.

Re: Kernel panic at boot from CD to install GRUB.

Posted: 30. Mar 2012, 23:10
by Shador
globetrotterdk wrote:
Shador wrote:I could find nothing in that output. What kind of controller is this? Is it a USB one?
As I have posted before, I have been unable to determine the controller due to a lack of documentation
OK, alright. Just digged out that old post of yours. So the card reader is connected as a USB device.

The only weird thing is that no host controller driver (like ohci, ehci, xhci, ...) is loaded although you obviously have USB interfaces. But this might work (actually it seems the same instructions as for USB booting apply here):

Code: Select all

mkinird -c -u -m ehci_hcd:uhci_hcd:ohci_hcd:xhci-hcd:usb-storage -w 10
You need to run this from the SD card, too. So e.g. chroot again. If you still want to tweak this some more feel free to do so (like output file -o, or e.g. xhci is for USB 3.0). But let's try this for a starting point.
globetrotterdk wrote: So if you are tired of helping me, as you seem to be expressing, that is perfectly legitimate.
Yes, I'm tired of some stuff. But I'm not tired of providng helping. Although it might seem like I'm contradicting myself here. :lol:
globetrotterdk wrote:Not really sure why the files are acting as they are on my system, but I finally managed to get the file open with vim:
This was more or less what was getting on my nerves. ;)

Anyway, your grub.cfg does not yet contain an initrd and does not use UUID for the root partition. So be sure to run update-grub/grub-mkconfig again (chroot). Check the grub.cfg afterwards.

Re: Kernel panic at boot from CD to install GRUB.

Posted: 31. Mar 2012, 16:27
by globetrotterdk
OK, for some reason the SD card is now called /devsdb1 when I boot from the live system. So here is what I did:

Code: Select all

root[one]# mkdir /mnt/sdb1
root[one]# mount /dev/sdb1 /mnt/sdb1
root[one]# mount --bind /proc /mnt/sdb1/proc
root[one]# mount --bind /sys /mnt/sdb1/sys
root[one]# mount --bind /dev /mnt/sdb1/dev
root[one]# chroot /mnt/sdb1
root[/]# mkinird -c -u -m ehci_hcd:uhci_hcd:ohci_hcd:xhci-hcd:usb-storage -w 10
bash: mkinird: command not found
root[/]# mkinitrd -c -u -m ehci_hcd:uhci_hcd:ohci_hcd:xhci-hcd:usb-storage -w 10
OK: /lib/modules/2.6.37.6-smp/kernel/drivers/usb/host/ehci-hcd.ko added.
OK: /lib/modules/2.6.37.6-smp/kernel/drivers/usb/host/uhci-hcd.ko added.
OK: /lib/modules/2.6.37.6-smp/kernel/drivers/pcmcia/pcmcia_core.ko added.
OK: /lib/modules/2.6.37.6-smp/kernel/drivers/pcmcia/pcmcia.ko added.
OK: /lib/modules/2.6.37.6-smp/kernel/drivers/mmc/core/mmc_core.ko added.
OK: /lib/modules/2.6.37.6-smp/kernel/drivers/ssb/ssb.ko added.
OK: /lib/modules/2.6.37.6-smp/kernel/drivers/usb/host/ohci-hcd.ko added.
OK: /lib/modules/2.6.37.6-smp/kernel/drivers/usb/host/xhci-hcd.ko added.
OK: /lib/modules/2.6.37.6-smp/kernel/drivers/usb/storage/usb-storage.ko added.
11628 blocks
/boot/initrd.gz created.
Be sure to run lilo again if you use it.
root[/]# update-grub
Generating grub.cfg ...
Found background: /boot/grub/salix.jpg
Found linux image: /boot/vmlinuz-huge-smp-2.6.37.6-smp
done
Here is what the new grub.cfg file looks like:

Code: Select all

#
# 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 $prefix/grubenv ]; then
  load_env
fi
set default="${saved_entry}"
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 load_video {
  insmod vbe
  insmod vga
  insmod video_bochs
  insmod video_cirrus
}

insmod part_msdos
insmod ext2
set root='(hd1,msdos1)'
search --no-floppy --fs-uuid --set=root 8719a6da-67e4-491c-bc85-569798593ee4
if loadfont /usr/share/grub/unicode.pf2 ; then
  set gfxmode=auto
  load_video
  insmod gfxterm
  insmod part_msdos
  insmod ext2
  set root='(hd1,msdos1)'
  search --no-floppy --fs-uuid --set=root 8719a6da-67e4-491c-bc85-569798593ee4
  set locale_dir=($root)/boot/grub/locale
  set lang=en_US
  insmod gettext
fi
terminal_output gfxterm
insmod part_msdos
insmod ext2
set root='(hd1,msdos1)'
search --no-floppy --fs-uuid --set=root 8719a6da-67e4-491c-bc85-569798593ee4
insmod jpeg
background_image -m stretch /boot/grub/salix.jpg
set timeout=5
### END /etc/grub.d/00_header ###

### BEGIN /etc/grub.d/10_linux ###
menuentry 'Salix 13.37.0 GNU/Linux, with Linux 2.6.37.6-smp' --class salix --class gnu-linux --class gnu --class os {
	load_video
	set gfxpayload=keep
	insmod gzio
	insmod part_msdos
	insmod ext2
	set root='(hd1,msdos1)'
	search --no-floppy --fs-uuid --set=root 8719a6da-67e4-491c-bc85-569798593ee4
	echo	'Loading Linux 2.6.37.6-smp ...'
	linux	/boot/vmlinuz-huge-smp-2.6.37.6-smp root=/dev/sdc1 ro vt.default_utf8=1 quiet
}
menuentry 'Salix 13.37.0 GNU/Linux, with Linux 2.6.37.6-smp (recovery mode)' --class salix --class gnu-linux --class gnu --class os {
	load_video
	set gfxpayload=keep
	insmod gzio
	insmod part_msdos
	insmod ext2
	set root='(hd1,msdos1)'
	search --no-floppy --fs-uuid --set=root 8719a6da-67e4-491c-bc85-569798593ee4
	echo	'Loading Linux 2.6.37.6-smp ...'
	linux	/boot/vmlinuz-huge-smp-2.6.37.6-smp root=/dev/sdc1 ro single vt.default_utf8=1
}
### END /etc/grub.d/10_linux ###

### BEGIN /etc/grub.d/20_linux_xen ###
### END /etc/grub.d/20_linux_xen ###

### BEGIN /etc/grub.d/30_os-prober ###
### 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 can't find any initrd in the file, but I can confirm that there is now a initrd.gz file in / on the SD card, as well as a new /boot/initrd-tree directory. I am unfortunately still getting kernel panics when i try to boot from the SD card. I am almost positive that the card reader should be supported by the ehci_hcd and ohci_hcd modules as the card reader is listed under Win XP as being USB 2 compatible, so that would make most sense. I'll do some more reading up on Grub, but I feel like we have hit a wall and I don't understand why.

Re: Kernel panic at boot from CD to install GRUB.

Posted: 31. Mar 2012, 16:44
by Shador
globetrotterdk wrote:I can't find any initrd in the file, but I can confirm that there is now a initrd.gz file in / on the SD card, as well as a new /boot/initrd-tree directory. I am unfortunately still getting kernel panics when i try to boot from the SD card. I am almost positive that the card reader should be supported by the ehci_hcd and ohci_hcd modules as the card reader is listed under Win XP as being USB 2 compatible, so that would make most sense. I'll do some more reading up on Grub, but I feel like we have hit a wall and I don't understand why.
No, problem, I know the cause. Grub ignores symlinks. I don't know wether that's true always, but in this case it is. So grub is actually seeing vmlinuz-huge-smp-2.6.37.6-smp. It's looking for a corresponding image, but finds none as the initrd is lacking the version string. This is probably going to work:

Code: Select all

mkinitrd -c -u -m ehci_hcd:uhci_hcd:ohci_hcd:xhci-hcd:usb-storage -w 10 -o /boot/initrd-2.6.37.6-smp
Possibly you need to create a symlink from config-2.6.37.6-smp to config-huge-2.6.37.6-smp. But I'm not sure whether grub2 actually needs that file.

Re: Kernel panic at boot from CD to install GRUB.

Posted: 1. Apr 2012, 11:18
by globetrotterdk
OK, here is the output:

Code: Select all

root[one]# mount --bind /proc /mnt/sdb1/proc
root[one]# mount --bind /sys /mnt/sdb1/sys
root[one]# mount --bind /dev /mnt/sdb1/dev
root[one]# chroot /mnt/sdb1
root[/]# mkinitrd -c -u -m ehci_hcd:uhci_hcd:ohci_hcd:xhci-hcd:usb-storage -w 10 -o /boot/initrd-2.6.37.6-smp
OK: /lib/modules/2.6.37.6-smp/kernel/drivers/usb/host/ehci-hcd.ko added.
OK: /lib/modules/2.6.37.6-smp/kernel/drivers/usb/host/uhci-hcd.ko added.
OK: /lib/modules/2.6.37.6-smp/kernel/drivers/pcmcia/pcmcia_core.ko added.
OK: /lib/modules/2.6.37.6-smp/kernel/drivers/pcmcia/pcmcia.ko added.
OK: /lib/modules/2.6.37.6-smp/kernel/drivers/mmc/core/mmc_core.ko added.
OK: /lib/modules/2.6.37.6-smp/kernel/drivers/ssb/ssb.ko added.
OK: /lib/modules/2.6.37.6-smp/kernel/drivers/usb/host/ohci-hcd.ko added.
OK: /lib/modules/2.6.37.6-smp/kernel/drivers/usb/host/xhci-hcd.ko added.
OK: /lib/modules/2.6.37.6-smp/kernel/drivers/usb/storage/usb-storage.ko added.
11628 blocks
/boot/initrd-2.6.37.6-smp created.
Be sure to run lilo again if you use it.
root[/]# update-grub
Generating grub.cfg ...
Found background: /boot/grub/salix.jpg
Found linux image: /boot/vmlinuz-huge-smp-2.6.37.6-smp
Found initrd image: /boot/initrd-2.6.37.6-smp
done
Here is what the new grub.cfg file looks like:

Code: Select all

#
# 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 $prefix/grubenv ]; then
  load_env
fi
set default="${saved_entry}"
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 load_video {
  insmod vbe
  insmod vga
  insmod video_bochs
  insmod video_cirrus
}

insmod part_msdos
insmod ext2
set root='(/dev/sdb,msdos1)'
search --no-floppy --fs-uuid --set=root 8719a6da-67e4-491c-bc85-569798593ee4
if loadfont /usr/share/grub/unicode.pf2 ; then
  set gfxmode=auto
  load_video
  insmod gfxterm
  insmod part_msdos
  insmod ext2
  set root='(/dev/sdb,msdos1)'
  search --no-floppy --fs-uuid --set=root 8719a6da-67e4-491c-bc85-569798593ee4
  set locale_dir=($root)/boot/grub/locale
  set lang=en_US
  insmod gettext
fi
terminal_output gfxterm
insmod part_msdos
insmod ext2
set root='(/dev/sdb,msdos1)'
search --no-floppy --fs-uuid --set=root 8719a6da-67e4-491c-bc85-569798593ee4
insmod jpeg
background_image -m stretch /boot/grub/salix.jpg
set timeout=5
### END /etc/grub.d/00_header ###

### BEGIN /etc/grub.d/10_linux ###
menuentry 'Salix 13.37.0 GNU/Linux, with Linux 2.6.37.6-smp' --class salix --class gnu-linux --class gnu --class os {
	load_video
	set gfxpayload=keep
	insmod gzio
	insmod part_msdos
	insmod ext2
	set root='(/dev/sdb,msdos1)'
	search --no-floppy --fs-uuid --set=root 8719a6da-67e4-491c-bc85-569798593ee4
	echo	'Loading Linux 2.6.37.6-smp ...'
	linux	/boot/vmlinuz-huge-smp-2.6.37.6-smp root=UUID=8719a6da-67e4-491c-bc85-569798593ee4 ro vt.default_utf8=1 quiet
	echo	'Loading initial ramdisk ...'
	initrd	/boot/initrd-2.6.37.6-smp
}
menuentry 'Salix 13.37.0 GNU/Linux, with Linux 2.6.37.6-smp (recovery mode)' --class salix --class gnu-linux --class gnu --class os {
	load_video
	set gfxpayload=keep
	insmod gzio
	insmod part_msdos
	insmod ext2
	set root='(/dev/sdb,msdos1)'
	search --no-floppy --fs-uuid --set=root 8719a6da-67e4-491c-bc85-569798593ee4
	echo	'Loading Linux 2.6.37.6-smp ...'
	linux	/boot/vmlinuz-huge-smp-2.6.37.6-smp root=UUID=8719a6da-67e4-491c-bc85-569798593ee4 ro single vt.default_utf8=1
	echo	'Loading initial ramdisk ...'
	initrd	/boot/initrd-2.6.37.6-smp
}
### END /etc/grub.d/10_linux ###

### BEGIN /etc/grub.d/20_linux_xen ###
### END /etc/grub.d/20_linux_xen ###

### BEGIN /etc/grub.d/30_os-prober ###
### 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 ###
When I tried to boot from the card, there were a number of errors about modules already loaded and a complaint that the usb-storage module hadn't been loaded. At some point the whole thing dropped into a root shell. I have tried to find a log with the specifics of what happened, and even ran "cat" on the files to be sure that I wasn't just getting an empty file because of a permission problem, so I am pretty sure there isn't anything in the usual log files. Is there something in particular I should try if I were to try again to boot from the SD card and get dropped into the root shell?

Re: Kernel panic at boot from CD to install GRUB.

Posted: 1. Apr 2012, 13:25
by Shador
globetrotterdk wrote:Here is what the new grub.cfg file looks like:
Ok, that one's looking fine now.
globetrotterdk wrote:When I tried to boot from the card, there were a number of errors about modules already loaded and a complaint that the usb-storage module hadn't been loaded.
They should do no harm. You probably can try to remove some/all modules from the initrd once it's working as they seem to be built into the huge kernel. But you still need the initrd for the sleep and udev.
globetrotterdk wrote:I have tried to find a log with the specifics of what happened, and even ran "cat" on the files to be sure that I wasn't just getting an empty file because of a permission problem, so I am pretty sure there isn't anything in the usual log files.
No, there isn't. You're actually not yet in your normal system on the sd card. You're still in a temporary root, that's stored in memory and populated with a minimal system from the files in the initrd. The whole purpose of that temporary system is just to make your actual root accessible in non-trivial boot scenarios.
globetrotterdk wrote:Is there something in particular I should try if I were to try again to boot from the SD card and get dropped into the root shell?
Yes, it's probably time to do the changes I mentioned regarding fstab. Check the output of blkid to see which uuids go with your sd card then replace the devices (e.g. /dev/sdc1) with UUID=<uuid>.

If it still fails try running mount and blkid from the prompt you're being dropped at. Apart it's highly useful if you could catch the reason why you're being dropped to the shell or at least at which point that's happening (last, exact message before you're dropped would help here e.g.).
But I guess you're getting this:

Code: Select all

  echo
  echo "RESCUE mode"
  echo
  echo "        You can try to fix or rescue your system now. If you want"
  echo "        to boot into your fixed system, mount your root filesystem"
  echo "        read-only under /mnt:"
  echo
  echo "            # mount -o ro -t filesystem root_device /mnt"
  echo
  echo "        Type 'exit' when things are done."
  echo
or this:

Code: Select all

    echo "ERROR:  No /sbin/init found on rootdev (or not mounted).  Trouble ahead."
    echo "        You can try to fix it. Type 'exit' when things are done." 
    echo

Re: Kernel panic at boot from CD to install GRUB.

Posted: 1. Apr 2012, 14:20
by globetrotterdk
OK, here is the latest info I have. My fstab now looks like this:

Code: Select all

UUID=b5a3988d-923f-416f-a88c-03e55bcceaaf    swap             swap        defaults         0   0
UUID=8719a6da-67e4-491c-bc85-569798593ee4    /                ext4        noatime,defaults 1   1
UUID=3e840f9c-f99c-48f7-989c-62275f126c2e    /home            ext4        defaults         1   2
#/dev/cdrom      /mnt/cdrom       auto        noauto,owner,ro  0   0
/dev/fd0         /mnt/floppy      auto        noauto,users,rw,umask=00 0   0
devpts           /dev/pts         devpts      gid=5,mode=620   0   0
proc             /proc            proc        defaults         0   0
tmpfs            /dev/shm         tmpfs       defaults         0   0
The following is a large chunk of the errors I get when i boot from the SD card:

Code: Select all

/boot/initrd-2.6.37.6-smp Load kernel modules from initrd immage 
ehci_hcd: module is already loaded:
uhci_hcd:       "
ohci_hcd: module is already registered
modprobe: can't load module xhci-hcd: invalid argument
modprobe: can't load module usb-storage: invalid module format
mount: can't find /mnt in /etc/fstab
Error: No /sbin/init found on rootdev (or not mounted). Trouble ahead
You can try to fix it. Type 'exit' when things
are done.
/bin/sh: can't access tty; job control turned off.
/# exit
mount: mounting /sys on /mnt/sys failed: No such file or directory
mount: mounting /dev on /mnt/dev failed: No such file or directory

Kernel panic - not syncing: Attempted to kill init!
I hope that I was able to note down the important bits that you need.

Re: Kernel panic at boot from CD to install GRUB.

Posted: 1. Apr 2012, 15:21
by Shador
globetrotterdk wrote:OK, here is the latest info I have. My fstab now looks like this:
OK, the uuid for root seems right at least.
globetrotterdk wrote:I hope that I was able to note down the important bits that you need.
Yes, thank you. Apparently mkinitrd was not able to determine the root dev/fs when it is generated and it doesn't try to parse the kernel arguments.

Anyway, if you run it like this, that should fix it:

Code: Select all

mkinitrd -c -k 2.6.37.6-smp -u -w 10 -f ext4 -r UUID=8719a6da-67e4-491c-bc85-569798593ee4 -o /boot/initrd-2.6.37.6-smp
If that doesn't work you can add the modules again, but I'm certain that they're not needed (with the huge kernel):

Code: Select all

mkinitrd -c -k 2.6.37.6-smp -u -m ehci_hcd:uhci_hcd:ohci_hcd:xhci-hcd:usb-storage -w 10 -f ext4 -r UUID=8719a6da-67e4-491c-bc85-569798593ee4  -o /boot/initrd-2.6.37.6-smp
Should you ever update the kernel or change other relevant parts of your system, you need to change the corresponding arguments (like -k and -o for kernel upgrade):
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