Re: problem with lilo on thinkpad
- From: Tauno Voipio <tauno.voipio@xxxxxxxxxxxxx>
- Date: Wed, 31 Oct 2007 17:01:19 GMT
Ulrich Lauther wrote:
Hi,
I installed Slackware 12.0 on a IBM Thinkpad with 50 GByte sata drive.
Lilo was installed to the superblock of the Linux root partition,
/dev/sda3. I get a warning about lba32 addressing.
That partion was made bootable.
When I try to boot, I get "operating system missing".
Now, when I copy 512 bytes from /dev/sda3 to a file on the windows
partition and mention that file in window's boot.ini, mark
the windows partition bootable,
I get a boot-dialog on rebooting and after selecting Linux, I get
the expected Lilo prompt and everything works fine from there.
Any idea, why I cannot directly boot from the linux partition?
The only unusual thing (fdisk warns about this) is that the
partions are not in the sequence as they are numbered:
1. NTFS /dev/sda1
2. linux, root /dev/sda3
3. linux, swap /dev/sda4
4. VFAT /dev/sda2
/dev/sda2 is a windows rescue partion and I didn't dare to move it around.
Could this be the problem?
Or is this a ThinkPad peculiarity?
The partitions before the Linux root on the
disk are too large for the BIOS to address
the LILO code therre.
When booting, the only way to read the first
sectors of code is to use the BIOS disk drivers,
and the body of the boot code must be accessible
for the BIOS drivers.
There are different limits depending on the
age and settings of the BIOS.
This is the main reason why it is recommended
to have a separate smallish partition for /boot
at the start of the disk.
--
Tauno Voipio
tauno voipio (at) iki fi
.
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