Tobias Gasser wrote:
> since about 1 year i am using the same harddisk. as the procution system
> is a little outdated now, i wanted to make a 'fresh' disk.
>
> to boot from this disk i had to start an ubuntu livecd and install grub
> from this cd. the systems (i have built both 32bit and 64bit) can boot
> and run fine.
>
> but i can't install my own compiled grub as a boot-loader!
>
>
> /dev/sda1 = /boot
> /dev/sda2 = / (for 32bit)
> /dev/sda3 = / (for 64bit)
>
> /dev/sda4 = extended
> /dev/sda5 = SWAP
> /dev/sda6 = DATA
>
>
> booting the system with ubuntus grub works fine. running "grub install
> /dev/sda" from a chroot (dev, proc, sys are mounted with --bind) says
> everyting is fine but booting results in the grub console with:
>
> GRUB loading.
> Welcome to GRUB!
>
> error: disk 'hd0,msdos1' not found.
> Entering rescue mode...
>
>
> 'ls' just shows a newline - an empty list!
>
> rebooting the live-cd, reinstalling grub, putting my grub.conf into
> place - the system boots fine.
>
> i built grub as in the book.
>
> "grub-install /dev/sda" has no errors:
> Installatoin finished. no error reported
>
> grub from ubuntu can boot either partitions (32 or 64bit), so does grub
> from parted magic.
>
> i tried both grub versions i built (32/64) but none can boot, both just
> enter the console as mentionned above.
>
> grub.conf is very basic and works fine with grub from ubuntu and parted
> magic.
>
> ** cut
> set root='(hd0,1)'
> set timeout=10
> insmod ext2
> menuentry "linux 32bit" {
> linux /boot/kernel-3.4.18-t32 root=/dev/sda2
> }
> menuentry "linux 64bit" {
> linux /boot/kernel-3.4.18-t64 root=/dev/sda3
> }
If /boot is a separate partition, then the linux lines should look like:
linux /kernel-3.4.18-t64 root=/dev/sda3 ro
note the you don't specify /boot there. From the viewpoint of grub,
there is no /boot directory.
I suspect that you installed grub from ubuntu without /boot mounted as a
separate partition.
One thing to do is to drop to the grub command line and do:
grub> ls (hd0,1)
For the ubuntu instances, try:
linux (hd0,2)/boot/kernel-3.4.18-t32 root=/dev/sda2
linux (hd0,3)/boot/kernel-3.4.18-t64 root=/dev/sda3
The trick is to know which version of the grub configuration file is
being used. A simple 'grub install /dev/sda' will assume that it is
using /boot/grub/grub.cfg from where /boot is located when the install
is run.
Check this and let us know if you need more help.
-- Bruce
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