Grub2 problems

**fishin4guitars** · 01-03-2011

I'm having problems adding an entry in GRUB2. I have an Arch linux installation on sda4 with its /boot on sda3. Nothing i've tried works. Here's my current entry script:

Code:

#! /bin/sh
cat <<EOF
menuentry "Arch Linux" {
set root=(hd0,4)
linux /vmlinuz root=(hd0,3) ro
initrd /kernel26.img
EOF

(Yes, the initial ramdisk is called kernel26. I think this is odd, too.)

I've tried linux and initrd lines like this as well:

Code:

linux (hd0,3)/vmlinuz
initrd (hd0,3)/kernel26.img

But that may have been in grub legacy.
Any pointers?

**nujinini** · 01-03-2011

Hello fishin4guitars!

Welcome!

While waiting for the gurus to clarify on your issue, it might be of help if you can post the output of

fdisk -l (-l is small -L)
df -h

So we can have a better picture of your HD.

**Jonathan183** · 01-03-2011

Here is my entry to boot arch

Code:

menuentry "Arch Linux - Use this most of the time ;-)" --class archlinux --class gnu-linux --class gnu --class os {
    echo    Loading Arch Linux from sda1 ...
    insmod ext2
    set root='(hd0,1)'
    search --no-floppy --fs-uuid --set fe38efc3-1346-4a89-8393-0b6416366659
    echo    Loading Linux vmlinuz26 ...
    linux    /boot/vmlinuz26 root=/dev/sda1 ro rootdelay=1
    echo    Loading initial ramdisk ...
    initrd    /boot/kernel26.img
}

I don't have a separate boot partition but think you should be able to modify to suit. So your entry should be something like ...

Code:

menuentry "Arch Linux - boot sda3, root sda4" --class archlinux --class gnu-linux --class gnu --class os {
    echo    Loading Arch Linux from sda3 ...
    insmod ext2
    set root='(hd0,3)'
    search --no-floppy --fs-uuid --set uuid_for_sda3_goes_here_I_think
    echo    Loading Linux vmlinuz26 ...
    linux    /vmlinuz26 root=/dev/sda4 ro rootdelay=1
    echo    Loading initial ramdisk ...
    initrd    /kernel26.img
}

But I am not sure why

Code:

grub-mkconfig -o /boot/grub/grub.cfg

is not generating valid entries.

What errors do you get when you try to boot your existing entries?

**reed9** · 01-03-2011

Well, I don't use GRUB2, but looking at the Arch Wiki entry, your syntax seems wrong.

This should be point to the UUID or /dev

Code:

linux /vmlinuz root=(hd0,3) ro

Should probably be

Code:

linux /vmlinuz root=/dev/sda4 ro

**fishin4guitars** · 01-03-2011

Ok. I'll try this. I guess I thought it needed to be in grub's (hdx,y) format to work.

**fishin4guitars** · 01-05-2011

It actually starts booting, but then it says it can't find something (I can't remember, will update later), and puts me into a ramfs prompt ( [ramfs /]# ).

--------

I accidentally created this thread twice. Sorry.

--------

It can't find /sbin/init.

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Also, how did you set up your install so that there was no /boot partition? I've tried, and every time I've ended up with no /boot.

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