Alberto Hernando wrote:
> Hi.
>
> I've tried it, and:
>
> root:/boot/grub# grub-setup -r '(hd0,8)'
> No device is specified.
I gave incorrect advice before. Try:
grub-setup '(hd0)'
or
grub-setup /dev/sda
The -r should not be there. The syntax is:
grub-setup [OPTION]... DEVICE
If you use -r, then that is an option and DEVICE is still required.
For instance, look at the entry:
menuentry "GNU/Linux, Linux 2.6.30.2-lfs65" {
insmod ext2
set root=(hd0,1)
linux /linux-2.6.30.2-lfs65 root=/dev/sda5 ro
}
In this example, the root partition is /dev/sda1 and is mounted as /boot.
If no 'set root' instruction is specified, it will use the default. The
default is set by the -r option or if not specified at all it will be
guessed. How you figure this all out is not really obvious. I
couldn't find any documentation about it, so I read the code. :)
Note that the term root is overloaded and the 'set root' refers to the
partition where grub should search for files which is something quite
different from the root= parameter on the line starting with 'linux'
which is the partition that the linux kernel mounts as /.
However both these 'root's can point to the same place. It would look
something like:
menuentry "GNU/Linux, Linux 2.6.30.2-lfs65" {
insmod ext2
set root=(hd0,5)
linux /boot/linux-2.6.30.2-lfs65 root=/dev/sda5 ro
}
This is the case of a standard LFS build where /boot is just another
directory in /. As I wrote in the book, "Using the current lfs
partition will also work, but configuration for multiple systems is more
difficult."
-- Bruce
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