SliTaz Forum

new_u

Member

Registered: 2014-03-30

Posts: 93

Booting from logical partition

I've a disk partitioned thus :

partition 0 - ntfs - windows xp - 20 GB

partition 1 - ext4 -  SliTaz - 20 GB

partition 2 - ext4 -  linux distro_B - 20 GB

partition 3 - extended

partition 4 - logical - ext4 - 20 GB

partition 5 - logical - ext4 - 400 GB

The linux distro_B was originally in a different disk.  I  copied all the files from that disk to  partition 2(dev/sda3) , edited menu.lst accordingly and  distro_B boots flawlessly. Menu.lst entry is htis :

root (hd0,2)

kernel /boot/vmlinuz-linux root=/dev/sda3 nomodeset

However, if I put distro_B in partition 4 (dev/sda5), I get error 15 from grub - file not found.  Yes, I updated menu.lst to

root (hd0,4)

kernel /boot/vmlinuz-linux root=/dev/sda5 nomodeset

I'm wodering what the problem is and how to get grub to see the logical partition?

Any help will be greatly appreciated!

gibor

Moderator

Registered: 2011-04-30

Posts: 1,067

Re: Booting from logical partition

The primary partition are reserved on position 1 - 4, and the first logical partition are started anyway from 5 position.

Your correct partition table are

partition 0 - ntfs - windows xp - 20 GB

partition 1 - ext4 - SliTaz - 20 GB

partition 2 - ext4 - linux distro_B - 20 GB

partition 3 - extended

partition 5 - logical - ext4 - 20 GB

partition 6 - logical - ext4 - 400 GB

IMHO

new_u

Member

Registered: 2014-03-30

Posts: 93

Re: Booting from logical partition

Thanks for your reply gibor! I tried root(hd0,5) and got the same file not found error (15).

gparted lists the first logical partition as dev/sda5 so I think root(hd0, 4) is correct because grub starts counting at 0. Amyway I tried 4 and 5 and none works.

gibor

Moderator

Registered: 2011-04-30

Posts: 1,067

Re: Booting from logical partition

On my case have multiple partition, and grub legacy (0,97) work on all partition.

Grub at launch search folder /boot/grub on partition indicated, if it correct the boot run correctly.

The message error 15 is the grub not found the folder on partition indicated.

My partition table

   Device Boot      Start         End      Blocks  Id System

/dev/sda1   *        2048    61435903    30716928   7 HPFS/NTFS

/dev/sda2        61435904    83140607    10852352  83 Linux

/dev/sda3        83140608    91529215     4194304  82 Linux swap

/dev/sda4        91531262   488395928   198432333+  5 Extended

/dev/sda5        91531264   112560560    10514648+ 83 Linux

/dev/sda6       112562176   425480191   156459008  83 Linux

/dev/sda7       425482240   445962239    10240000  83 Linux

/dev/sda8       445964288   488395928    21215820+ 83 Linux

sda1 so Seven

sda2 so SliTaz

sda3 swap

sda4 extended

sda5 rolling-testing

sda6 data partition

sda7 linux lfs

sda8 partition for various so testing

the menu.lst

title Slitaz kernel-2.6.37

root (hd0,1)

kernel /boot/vmlinuz-2.6.37-slitaz root=/dev/sda2 quiet

title SliTaz-rolling-dev

root (hd0,7)

kernel /boot/vmlinuz-3.2.71-slitaz nomodeset root=/dev/sda8

title SliTaz-lfs

root (hd0,6)

kernel /boot/vmlinuz nomodeset root=/dev/sda7

title Windows

Seven

rootnoverify (hd0,0)

chainloader +1

makeactive

title SliTaz live

root (hd0,5)

kernel /boot/vmlinuz-2.6.37-slitaz lang=it_IT kmap=it

initrd /boot/rootfs.gz

title SliTaz-rolling live

root (hd0,5)

kernel /boot/rolling-core/boot/vmlinuz-3.2.71-slitaz lang=it_IT kmap=it

initrd /boot/rolling-core/boot/rootfs.gz

title Acronis

root (hd0,5)

kernel /boot/acronis/dat3.dat vga=791 ramdisk_size=131072 acpi=off quiet mbrcrcs=on /s

initrd /boot/acronis/dat2.dat

title Boot Options

lock

find --set-root /boot/grub/submenu.lst

configfile /boot/grub/submenu.lst

new_u

Member

Registered: 2014-03-30

Posts: 93

Re: Booting from logical partition

Thanks gibor. My partition table isn't too different from yours and menu.lst looks more or less the same too, So I'm still clueless. I'll take a look at grub's manual.

new_u

Member

Registered: 2014-03-30

Posts: 93

Re: Booting from logical partition

So I used grub's console mode and made sure that grub can see hd0,4 and of course it can. But it turns out I had made a pretty stupid mistake when copying files and that's why it wouldn't find the kernel image. Sorry I wasted your time and thanks again.