grub dual boot [solved]

Birnenpfluecker · Posted: Mon Mar 15, 2004 5:27 pm Post subject: grub dual boot [solved]

Hi everyone, cannot get grub to dual boot.
Gentoo starts perfectly, but when trying windows I get
Filesystem type unknown 0x7 or
Invalid or unsupported executable file format
this depends which config I try, got a third error also, but don't remember with which config it was and cannot recreate it and forgot the messagge.
Here is my what my grub.conf looks atm:

Getrb · Posted: Mon Mar 15, 2004 5:54 pm Post subject:

Your dual entrys doesent look good...
Also... have you installed dual OS on the same partition?? (Nope!)

An sample of how it could look:

#For booting Windows NT or Windows95
title Windows NT / Windows 95 boot menu
rootnoverify (hd0,1)
makeactive
chainloader +1
# For loading DOS if Windows NT is installed
# chainload /bootsect.dos

Edit: an hash in place :oops:

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Birnenpfluecker · Posted: Mon Mar 15, 2004 6:30 pm Post subject:

with that config I get :
Error 13: Invalid or unsupported executable file format
Wen I use auto complete of grub, hd0,1 is x82 patition that would be my linuix swap.

And for not installed win and linux on same partition, I think that the map command change hd1 and hd0, so I can have in both entries a hd0.

Getrb · Posted: Mon Mar 15, 2004 7:09 pm Post subject:

Okej on what drive / partition is your Windows located?

Here is how id do this anyhow.

Birnenpfluecker · Posted: Mon Mar 15, 2004 7:52 pm Post subject:

tested that configuration, with changing nothing, cause win is on hd1,0.
I get no error message, but my pc speker goes crazy. many short beeps without ending.

To be clearly here my hd's
/boot sdb1
/swap sdb2
/root sdb3
win is on sda

But Grub refers to the gentoo drive as hd0, cause i start gentoo with root (hd0,0)

Getrb · Posted: Mon Mar 15, 2004 8:44 pm Post subject:

My guess is something has happened to your sda mbr.

If you turn off booting sdb in BIOS and run an sda boot only what happens then??

To solve it in case that works: Run something like grub-install /dev/sda

Dont work: try a rescue from the XP-install cdrom (Cant quite remember the exact commands but there you got some goodies to write a new startsector mbr and repair if needed.

Probably you can find a howto on this issue on the 32bit forum part.
Google is a friend :-)
Or you can go for some of the wiki's...
In Swedish id recommend http://bbs.linux.se

To get things right though id switch those disks master / slave order!!! Your boot-partition is in best place at the master-drive.

This way no hassels for you about the names of the drives in grub.
_________________
WANTED: a Linux-based webshop, *secure *good layout *output for the books and more! Ideas? :-)

Birnenpfluecker · Posted: Mon Mar 15, 2004 9:29 pm Post subject:

if I turn linux in bios off, windows starts without a problem, but what for hal I use grub-install ons sda? that is my woindows installation...

Getrb · Posted: Mon Mar 15, 2004 9:54 pm Post subject:

Well uve got sata disks so a mere shifting the cabels if u got the disks set to "cabel select" or just rejumpering master / slave.

This way (hd0,0) is /boot
(hd0,2) is /

And your Win is (hd1,0)

This has got to work.

Otherwise the table is:
Win (hd0,0)

/boot (hd1,0)
/ (hd1,2)

As you get win working correctly doing only sda.
You'll probably get it right booting only sdb on reverse order in grub.conf

Birnenpfluecker · Posted: Tue Mar 16, 2004 12:26 am Post subject:

have changed the cable, but nothing new.

Haven't you read my previos post correct?
grub refers to sdb as hd0 and sda as hd1,
if I change the cables that changes nothing. I guess this is because grub seems to refer to the drive on which it is installed as hd0 (corrct me if I'm wrong).
And for the rejumpering, that doesn't work with SATA discs, cause one disc per cable and no jumpers on the discs :wink:

lun_IX · Posted: Tue Mar 16, 2004 7:05 am Post subject:

@Birnenpfluecker:

you'll have no problems, installing Grub on the MBR of your Windows HDD! It's same here:

hda1 - /boot
hda2 - /
hda3 - Windows XP
hda4 - /NTFS some windows stuff

hdb1 - /swap
hdb2 - /NTFS some windows stuff
...

Grub ist in MBR of hda and no problems booting windows or linux, haven't got my grub.conf at hand because i'm at work, but i guess it looks like that:

Birnenpfluecker · Posted: Tue Mar 16, 2004 10:59 am Post subject:

You have grub on an extra partition of your win hd, but on my win hd I have only the win partition. Don't want to destroy it. Is there a way to create the /boot partition on then win hd without destroying win?

lun_IX · Posted: Tue Mar 16, 2004 12:11 pm Post subject:

moving it or resizing it with Partition Magic under Windows ...

just resize it to a size 50meg smaller than before an then move it these 50meg backwards to the end of the HDD.
After that you should have 50meg unpartitioned HDD Space on your drive.

make a linux partition with fdisk and then mke2fs /dev/hda1 mount it as /boot and everything should work...

but by the way, i don't think you gonna need that, because grub will install itself not on the partition but in the Master Boot Record (mbr) of the chosen disc! you might even have the /boot directory on your / Partition of Linux, it has not to be an extra partition!

Might it be, you have /boot at hdb1 an the Win Partition on /hda1 - then it is no problem to mount /dev/hdb1 to /boot, install grub there! in grub tell him

Birnenpfluecker · Posted: Tue Mar 16, 2004 1:54 pm Post subject:

thx lun_IX
worked like a charm.

lun_IX · Posted: Tue Mar 16, 2004 1:57 pm Post subject:

glad i could help!