Re: [lfs-support] A question on Multiboot

[Tim Tassonis]

On 09/15/2016 03:27 PM, William Harrington wrote:

On Thu, September 15, 2016 13:08, Rob wrote:


# # #
/boot/grub/grub.cfg on /dev/sda1
set default=0
set timeout=-1
insmod ext2
set root=(hd0,1)
menuentry "GNU/Linux, Linux 4.7.2-newbean" {
linux   /boot/vmlinuz-4.7.2 root=/dev/sda1 ro
}
menuentry "GNU/Linux, Linux 4.2-l-bean" {
linux   /boot/vmlinuz-4.2-lfs-7.8 root=/dev/sdb1 ro
}



You need to specify the Grub's root for each path to the kernel:

menuentry "GNU/Linux, Linux 4.7.2-newbean" {
linux   (hd0,1)/boot/vmlinuz-4.7.2 root=/dev/sda1 ro
}
menuentry "GNU/Linux, Linux 4.2-l-bean" {
linux   (hd1,1)/boot/vmlinuz-4.2-lfs-7.8 root=/dev/sdb1 ro



you can also just put set root on every entry:

menuentry "GNU/Linux, Linux 4.7.2-newbean" {
 set root (hd0,1)
 linux /boot/vmlinuz-4.7.2 root=/dev/sda1 ro
}
menuentry "GNU/Linux, Linux 4.2-l-bean" {
set root (hd1,1)
linux /boot/vmlinuz-4.2-lfs-7.8 root=/dev/sdb1 ro



I use it like this, didn't know about the possibility to prepend the 
kernel filename with the had.




Cheers
Tim





If recall, that is the way to do it and not use the variable set early for
"set root="


# # #
That doesn't appear to work, however; I can only boot  the 4.7.2 system.
Does
" vmlinuz-4.2-lfs-7.8 "
need to be in the /boot partition of /dev/sda1 for this to work
 properly, since I have grub installed there?
Thank you all for the help--and the patience.


Sincerely,

William Harrington




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Tim Tassonis
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Re: [lfs-support] A question on Multiboot

[Rob]

William Harrington  wrote:
> You need to specify the Grub's root for each path to the kernel:

> If recall, that is the way to do it and not use the variable set early for
> "set root="

Thanks. That did the trick.
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Re: [lfs-support] A question on Multiboot

[William Harrington]

On Thu, September 15, 2016 13:08, Rob wrote:

> # # #
> /boot/grub/grub.cfg on /dev/sda1
> set default=0
> set timeout=-1
> insmod ext2
> set root=(hd0,1)
> menuentry "GNU/Linux, Linux 4.7.2-newbean" {
> linux   /boot/vmlinuz-4.7.2 root=/dev/sda1 ro
> }
> menuentry "GNU/Linux, Linux 4.2-l-bean" {
> linux   /boot/vmlinuz-4.2-lfs-7.8 root=/dev/sdb1 ro
> }


You need to specify the Grub's root for each path to the kernel:

menuentry "GNU/Linux, Linux 4.7.2-newbean" {
linux   (hd0,1)/boot/vmlinuz-4.7.2 root=/dev/sda1 ro
}
menuentry "GNU/Linux, Linux 4.2-l-bean" {
linux   (hd1,1)/boot/vmlinuz-4.2-lfs-7.8 root=/dev/sdb1 ro


If recall, that is the way to do it and not use the variable set early for
"set root="

> # # #
> That doesn't appear to work, however; I can only boot  the 4.7.2 system.
> Does
> " vmlinuz-4.2-lfs-7.8 "
> need to be in the /boot partition of /dev/sda1 for this to work
>  properly, since I have grub installed there?
> Thank you all for the help--and the patience.

Sincerely,

William Harrington
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[lfs-support] A question on Multiboot

[Rob]

Here's the situation.
I've got two LFS systems, one on /dev/sda1 and the other on
/dev/sdb1. They each have their kernels in the /boot directories on
those drives. So I don't have a separate /boot partition. A little
bit of an oversight on my part.
I know I could back up things, erase partitions and start over
with a separate /boot, but that's a lot of bother.
So, what would be the proper grub configuration to fix it so that
both systems can be booted? Right now, I have this
# # #
/boot/grub/grub.cfg on /dev/sda1
set default=0
set timeout=-1
insmod ext2
set root=(hd0,1)
menuentry "GNU/Linux, Linux 4.7.2-newbean" {
linux   /boot/vmlinuz-4.7.2 root=/dev/sda1 ro
}
menuentry "GNU/Linux, Linux 4.2-l-bean" {
linux   /boot/vmlinuz-4.2-lfs-7.8 root=/dev/sdb1 ro
}
# # #
That doesn't appear to work, however; I can only boot  the 4.7.2 system.
Does
" vmlinuz-4.2-lfs-7.8 "
need to be in the /boot partition of /dev/sda1 for this to work
 properly, since I have grub installed there?
Thank you all for the help--and the patience.
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Do not top post on this list.

A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
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http://en.wikipedia.org/wiki/Posting_style