[SOLVED] Booting LFS on separate USB HDD + separate /boot parition

spiky0011 · 12-13-2011, 02:48 PM

They all look ok to me, you dont have to do any update as you reboot that reloads grub.

druuna · 12-13-2011, 02:52 PM

Hi,

Like I said I don't have any experience with grub and using UUID's. It looks like you need to do a bit more then using a UUID=...... setting. I'm not 100% sure what does(n't) need to be done at this moment.

Here's your original grub.cfg file, changed to use sda:

Code:

# Begin /boot/grub/grub.cfg
set default=0
set timeout=5
insmod ext2
set root=(hd0,4)
set root=(hd0,1)
menuentry "GNU/Linux, Linux 3.1-lfs-7.0" {
linux /vmlinuz-3.1-lfs-7.0 root=/dev/sda1 ro
linux /vmlinuz-3.1-lfs-7.0 root=/dev/sda4 ro
}

BTW Your /boot is a separate partition, set root should point to sda1, and your linux line should point to sda4 and the /boot part should be removed.

I also noticed this:

Quote:

error: no kernel specified
error: unknown command '/boot/vmlinux-3.1-lf

I do hope that that is a typo (the missing s-7.0 part).....

spiky0011 · 12-13-2011, 03:02 PM

Hi drunna I found that having "root=/dev/sda1 ro" it then looked at the sda drive not the sdb.
As in "mine IS Ubuntu" not lfs it got confusing. I will try a new grub.cfg file to check

nivwusquorum I notice you have used ext4 file system did you select this while you were building the kernel?

nivwusquorum · 12-13-2011, 03:20 PM

@Druuna

I didn't know that by root they mean root partition, I tried (hd0,4) and (hd0,msdos4) .

@Spiky

Hmm.. That sounds interesting. I selected the drivers for ext4 in drivers config section. Is there any other place I should have selected it while configuring kernel?

spiky0011 · 12-13-2011, 03:24 PM

I changed the root sdb to sda it didn't boot also changed fstab to sda still np luck switched it all back is all working.
nivwusquorum do you have 2 external drives and what is the output of

Code:

fdisk -l

spiky0011 · 12-13-2011, 03:26 PM

Have a look in filesystem they are not selected by default. I selected the same 1,s as listed for ext3. That will also stop it from booting

nivwusquorum · 12-13-2011, 03:31 PM

Here's output of fdisk -l :

Code:

Disk /dev/sda: 320.1 GB, 320072933376 bytes
255 heads, 63 sectors/track, 38913 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: 0x5e6033e8

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1               1        1777    14266368   27  Unknown
/dev/sda2   *        1778       19624   143356027+   7  HPFS/NTFS
/dev/sda3           19625       38913   154938892+   5  Extended
/dev/sda5           19625       28464    71007268+  83  Linux
/dev/sda6           28465       29072     4883728+  82  Linux swap / Solaris
/dev/sda7   *       29073       38913    79047801    7  HPFS/NTFS

Disk /dev/sdb: 250.1 GB, 250059350016 bytes
255 heads, 63 sectors/track, 30401 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: 0x00023e52

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1               1          12       96358+  83  Linux
/dev/sdb2            3040        4012     7815622+  82  Linux swap / Solaris
/dev/sdb3            4013       30401   211969642+   5  Extended
/dev/sdb4              13        3039    24314377+  83  Linux
/dev/sdb5            4013       10091    48829536   83  Linux

Partition table entries are not in disk order

@Spiky: I am sorry, I didn't understand your last post.

spiky0011 · 12-13-2011, 03:44 PM

Ok as you are using ext4 file system it needs to be selected in the kernel.In general/settings/file system you need to enable ext4. If you look at the ext3 selections, I just copied the same 1,s them in ext4. I think there are 4 that have to be enabled,

nivwusquorum · 12-13-2011, 04:15 PM

well I have enable it there, I am sorry, I didn't remember that. Now I am trying different filesystem for boot partition, but still didn't get it to work...

spiky0011 · 12-13-2011, 04:21 PM

ext4 should be ok as that is what your partition is formatted to. If you rebuild the kernel you need to check that each time. So if your fstab and grub.cfg are set. Not sure where else to go I have the same setup as you

spiky0011 · 12-13-2011, 04:24 PM

Are you using sata drive ? and maybe have a look through usb stuff in the kernel, Although it dose see it

spiky0011 · 12-13-2011, 04:39 PM

Are you building this on a laptop or desktop?

nivwusquorum · 12-13-2011, 04:54 PM

Hi Spiky, I am using SATA drive, and I am building on laptop. Why?

spiky0011 · 12-13-2011, 05:11 PM

You could put the drive into the laptop as the only drive to get it to boot that would sort out the fstab and grub.cfg files. Then you could sort out any other problems, meaning eliminate some things that cause problems. When I 1st done mine I built it on the usb option it wouldn't boot installed in laptop booted so the system all worked, just had to fiddle about with a few other things. Any thoughts on this ?? drunna.

There was a couple of options in the kernel as well SCSI device support.
Is scsi device support enabled? and scsi disk support enabled these are to do with usb drives mark them with a "Y" not "M"

nivwusquorum · 12-13-2011, 05:24 PM

ok, I will try to fiddle a little bit with kernel. Is it safe to rebuild kernel by just repeating steps from linux-3.1 section from LFS 7.0 book? I was also thinking about trying out to use my host system (ubuntu) kernel config file, just to see if it works.

Although it is a little bit weird to try to fix this issue by randomly trying to do some things. Is there any way to determine which file exactly grub cannot find and at what stage?

Thanks!