Re: built LFS7 wont boot from usb harddrive
On Sun, 2011-11-13 at 01:26 +, Andrew Benton wrote:
On Sat, 12 Nov 2011 22:53:11 +
spiky martynvid...@aol.com wrote:
I have built lfs7 with linux 3.1rc4. I cant boot it when on sdc. If
drive is put in laptop on IDE it will boot. I have set the fstab
grub.cfg in lots of different ways still no joy,
grub.cfg
# Begin /boot/grub/grub.cfg
set default=0
set timeout=5
insmod ext2
set root=(hd2,1)
menuentry GNU/Linux, Linux 3.1-lfs-7.0 {
linux /boot/vmlinuz-3.1-lfs-7.0 root=/dev/sdc1
}
fstab
# Begin /etc/fstab
# file system mount-point type options dump fsck
#order
/dev/sdc1 /ext4 defaults1 1
/dev/sdc2 swap swap pri=1 0 0
proc /procproc defaults0 0
sysfs /sys sysfs defaults0 0
devpts /dev/pts devpts gid=4,mode=620 0 0
tmpfs /run tmpfs defaults0 0
# End /etc/fstab
I would like it to boot off it,s own drive selected by bios (bios dose
allow booting from usb)
At what point in the boot process does the boot fail (BIOS, grub or
kernel)? What sort of error messages do you get when the boot fails?
Give us a clue, what actually happens?
FWIW fstab is irrelevent for a boot failing. The kernel gets its root
partition from the grub command line in grub.cfg and mounts that read
only. /etc/fstab comes into play later when the bootscripts do their
work.
Andy
Ok I used grub prompt it showed the usb drive
hd0,msdos1(LFS-7.0),2(swap),3(home).
then entered set root=(hd0,msdos)
linux /boot/vmlinux-3.1-7.0 (it found with tab)root=/devsda1
boot
i get
no filesystem could mount root tried ext 3 ,2, 4 etc
also Kernel panic not syncing VFS unable to mount root fson unknown
block (8.1).
This is the same as I get when I let it boot as normal for this drive.
Martyn
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Re: built LFS7 wont boot from usb harddrive
On Sun, 13 Nov 2011 10:36:34 + spiky martynvid...@aol.com wrote: Ok I used grub prompt it showed the usb drive hd0,msdos1(LFS-7.0),2(swap),3(home). then entered set root=(hd0,msdos) linux /boot/vmlinux-3.1-7.0 (it found with tab)root=/devsda1 boot i get no filesystem could mount root tried ext 3 ,2, 4 etc also Kernel panic not syncing VFS unable to mount root fs on unknown block (8.1). This is the same as I get when I let it boot as normal for this drive. That looks like a kernel panic, which is good because it means you've got past the BIOS and grub. It could be that you've not compiled the kernel with support for the root filesystem built into the kernel. It could also be that the kernel config is fine but you've passed it the wrong root= option on the grub command line. I'm pretty sure I'd get a similar looking kernel panic if I tried to boot my kernel with root= pointing to my swap partition. Another possibility is that the kernel sees the partition as /dev/sdb1 or /dev/hdc1 or some such. There's no way to be sure other than to try all the combinations you can think of and see what works. If none of them work then the problem is probably with your kernel config so you'll have to work on that recompile your kernel until you get one that boots. Andy -- http://linuxfromscratch.org/mailman/listinfo/lfs-support FAQ: http://www.linuxfromscratch.org/lfs/faq.html Unsubscribe: See the above information page
Re: built LFS7 wont boot from usb harddrive
On 13/11/11 11:50, Andrew Benton wrote: On Sun, 13 Nov 2011 10:36:34 + spikymartynvid...@aol.com wrote: Ok I used grub prompt it showed the usb drive hd0,msdos1(LFS-7.0),2(swap),3(home). then entered set root=(hd0,msdos) linux /boot/vmlinux-3.1-7.0 (it found with tab)root=/devsda1 boot i get no filesystem could mount root tried ext 3 ,2, 4 etc also Kernel panic not syncing VFS unable to mount root fs on unknown block (8.1). This is the same as I get when I let it boot as normal for this drive. That looks like a kernel panic, which is good because it means you've got past the BIOS and grub. It could be that you've not compiled the kernel with support for the root filesystem built into the kernel. It could also be that the kernel config is fine but you've passed it the wrong root= option on the grub command line. I'm pretty sure I'd get a similar looking kernel panic if I tried to boot my kernel with root= pointing to my swap partition. Another possibility is that the kernel sees the partition as /dev/sdb1 or /dev/hdc1 or some such. There's no way to be sure other than to try all the combinations you can think of and see what works. If none of them work then the problem is probably with your kernel config so you'll have to work on that recompile your kernel until you get one that boots. Andy Even tho the system will boot when an ide, I did recompile kernel yesterday checking sata stuff and usb. It just seems confusing as I know it will boot until connected as usb. I will try kernel again checking for root file system support. -- http://linuxfromscratch.org/mailman/listinfo/lfs-support FAQ: http://www.linuxfromscratch.org/lfs/faq.html Unsubscribe: See the above information page
RE: built LFS7 wont boot from usb harddrive
hd0,msdos1(LFS-7.0),2(swap),3(home). ^^ Could it be that the partition is FAT32 instead of ext(2,3,4)? Alain -- http://linuxfromscratch.org/mailman/listinfo/lfs-support FAQ: http://www.linuxfromscratch.org/lfs/faq.html Unsubscribe: See the above information page
Re: built LFS7 wont boot from usb harddrive
On 13/11/11 12:36, Alain Toussaint wrote: hd0,msdos1(LFS-7.0),2(swap),3(home). ^^ Could it be that the partition is FAT32 instead of ext(2,3,4)? Alain I formatted the partition with gparted to ext4 swap is swap home ext4 Martyn -- http://linuxfromscratch.org/mailman/listinfo/lfs-support FAQ: http://www.linuxfromscratch.org/lfs/faq.html Unsubscribe: See the above information page
Re: built LFS7 wont boot from usb harddrive
On 13/11/11 12:38, spiky wrote: On 13/11/11 12:36, Alain Toussaint wrote: hd0,msdos1(LFS-7.0),2(swap),3(home). ^^ Could it be that the partition is FAT32 instead of ext(2,3,4)? Alain I formatted the partition with gparted to ext4 swap is swap home ext4 Martyn Ok I have run kernel config again I enabled all filesystems ext2,3,4 in the file section hope this was the right place for root filesystem. I ran grub prompt on my ubuntu system (IDE) (set root hd0,2) then (root =/dev/sda2) that boots. I tried ubuntu 11.10 which is on sdb (usb) Couldn,t get it to boot? from grub prompt but will if select that harddrive from bios. I redone LFS grub.cfg root=hdo,2 then linux root=UUID=uuid no still no joy -- http://linuxfromscratch.org/mailman/listinfo/lfs-support FAQ: http://www.linuxfromscratch.org/lfs/faq.html Unsubscribe: See the above information page
Re: built LFS7 wont boot from usb harddrive
Andrew Benton wrote: On Sun, 13 Nov 2011 10:36:34 + spiky martynvid...@aol.com wrote: Ok I used grub prompt it showed the usb drive hd0,msdos1(LFS-7.0),2(swap),3(home). then entered set root=(hd0,msdos) That seems right. The msdos part is the boot record type, not a partition type, linux /boot/vmlinux-3.1-7.0 (it found with tab)root=/devsda1 Is there a missing / or just a typo? Should be /dev/sda1 boot i get no filesystem could mount root tried ext 3 ,2, 4 etc also Kernel panic not syncing VFS unable to mount root fs on unknown block (8.1). When you have a problem with a lot of new things, isolate the new from the old. I recommend going back to a ext3 partition until you get it working. This is the same as I get when I let it boot as normal for this drive. That looks like a kernel panic, which is good because it means you've got past the BIOS and grub. Right. It could also be that the kernel config is fine but you've passed it the wrong root= option on the grub command line. That would be my thought too. I'm pretty sure I'd get a similar looking kernel panic if I tried to boot my kernel with root= pointing to my swap partition. Another possibility is that the kernel sees the partition as /dev/sdb1 or /dev/hdc1 or some such. There's no way to be sure other than to try all the combinations you can think of and see what works. If none of them work then the problem is probably with your kernel config so you'll have to work on that recompile your kernel until you get one that boots. BTW, the kernel doesn't understand root=UUID=uuid. You have to have a initrd for that. I'm not sure if the kernel understands root=LABEL=label or not. Just remember that grub's root and the kernel's root are not, in general, the same thing, although they could point to the same place. -- Bruce -- http://linuxfromscratch.org/mailman/listinfo/lfs-support FAQ: http://www.linuxfromscratch.org/lfs/faq.html Unsubscribe: See the above information page
Re: built LFS7 wont boot from usb harddrive
On 13/11/11 17:12, Bruce Dubbs wrote: Andrew Benton wrote: On Sun, 13 Nov 2011 10:36:34 + spikymartynvid...@aol.com wrote: Ok I used grub prompt it showed the usb drive hd0,msdos1(LFS-7.0),2(swap),3(home). then entered set root=(hd0,msdos) That seems right. The msdos part is the boot record type, not a partition type, linux /boot/vmlinux-3.1-7.0 (it found with tab)root=/devsda1 Is there a missing / or just a typo? Should be /dev/sda1 boot i get no filesystem could mount root tried ext 3 ,2, 4 etc also Kernel panic not syncing VFS unable to mount root fs on unknown block (8.1). When you have a problem with a lot of new things, isolate the new from the old. I recommend going back to a ext3 partition until you get it working. This is the same as I get when I let it boot as normal for this drive. That looks like a kernel panic, which is good because it means you've got past the BIOS and grub. Right. It could also be that the kernel config is fine but you've passed it the wrong root= option on the grub command line. That would be my thought too. I'm pretty sure I'd get a similar looking kernel panic if I tried to boot my kernel with root= pointing to my swap partition. Another possibility is that the kernel sees the partition as /dev/sdb1 or /dev/hdc1 or some such. There's no way to be sure other than to try all the combinations you can think of and see what works. If none of them work then the problem is probably with your kernel config so you'll have to work on that recompile your kernel until you get one that boots. BTW, the kernel doesn't understand root=UUID=uuid. You have to have a initrd for that. I'm not sure if the kernel understands root=LABEL=label or not. Just remember that grub's root and the kernel's root are not, in general, the same thing, although they could point to the same place. -- Bruce If I was to go back to ext3 would that mean a complete rebuild or is it possible to use gparted? -- http://linuxfromscratch.org/mailman/listinfo/lfs-support FAQ: http://www.linuxfromscratch.org/lfs/faq.html Unsubscribe: See the above information page
Re: built LFS7 wont boot from usb harddrive
On 13/11/11 17:12, Bruce Dubbs wrote:
Andrew Benton wrote:
On Sun, 13 Nov 2011 10:36:34 +
spikymartynvid...@aol.com wrote:
Ok I used grub prompt it showed the usb drive
hd0,msdos1(LFS-7.0),2(swap),3(home).
then entered set root=(hd0,msdos)
That seems right. The msdos part is the boot record type, not a
partition type,
linux /boot/vmlinux-3.1-7.0 (it found with tab)root=/devsda1
Is there a missing / or just a typo? Should be /dev/sda1
boot
i get
no filesystem could mount root tried ext 3 ,2, 4 etc
also Kernel panic not syncing VFS unable to mount root fs on unknown
block (8.1).
When you have a problem with a lot of new things, isolate the new from
the old. I recommend going back to a ext3 partition until you get it
working.
This is the same as I get when I let it boot as normal for this drive.
That looks like a kernel panic, which is good because it means you've
got past the BIOS and grub.
Right.
It
could also be that the kernel config is fine but you've passed it the
wrong root= option on the grub command line.
That would be my thought too.
I'm pretty sure I'd get a
similar looking kernel panic if I tried to boot my kernel with root=
pointing to my swap partition. Another possibility is that the kernel
sees the partition as /dev/sdb1 or /dev/hdc1 or some such. There's no
way to be sure other than to try all the combinations you can think of
and see what works. If none of them work then the problem is probably
with your kernel config so you'll have to work on that recompile your
kernel until you get one that boots.
BTW, the kernel doesn't understand root=UUID=uuid. You have to have a
initrd for that. I'm not sure if the kernel understands
root=LABEL=label or not.
Just remember that grub's root and the kernel's root are not, in
general, the same thing, although they could point to the same place.
-- Bruce
Ok just found a fix fstab
# Begin /boot/grub/grub.cfg
set default=0
set timeout=5
insmod ext2
set root=(hd0,1)
menuentry GNU/Linux, Linux 3.1-lfs-7.0 {
linux /boot/vmlinuz-3.1-lfs-7.0 root=/dev/sdc1 *rootdelay=30 ro*
}
any thoughts I will play with fstab, The idea is waiting for the usb to
load (google search)
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Re: built LFS7 wont boot from usb harddrive
spiky wrote:
If I was to go back to ext3 would that mean a complete rebuild or is it
possible to use gparted?
Create a new partition
mkfs -t ext3 /dev/sda?
mount /dev/sda? /mnt
mkdir /mnt/{bin,dev,home,lib,mnt,proc,sys,usr}
mkdir /mnt/{boot,etc,media,opt,root,sbin,srv,tmp,var}
for d in bin home lib usr boot etc opt root sbin srv var; do
cp -ap /$d/* /mnt/$d
done
Do not copy /proc, /sys, /dev, /run, /tmp
---
If you can get another system up, this would be easier:
mkdir /mnt/{old,new}
mount /dev/sda1 /mnt/old
mount /dev/sda? /mnt/new
cp -ap /mnt/old/* /mnt/new
-- Bruce
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Re: built LFS7 wont boot from usb harddrive
On Sun, Nov 13, 2011 at 7:24 PM, Bruce Dubbs bruce.du...@gmail.com wrote:
spiky wrote:
If I was to go back to ext3 would that mean a complete rebuild or is it
possible to use gparted?
Create a new partition
mkfs -t ext3 /dev/sda?
mount /dev/sda? /mnt
mkdir /mnt/{bin,dev,home,lib,mnt,proc,sys,usr}
mkdir /mnt/{boot,etc,media,opt,root,sbin,srv,tmp,var}
I wouldn't just create these dirs, my advice would be follow the
instructions in chapter 6.5 of the LFS book[1].
Matijn
[1] http://www.linuxfromscratch.org/lfs/view/stable/chapter06/creatingdirs.html
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