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xombael
n00b
Joined: 07 Oct 2016
Posts: 6
Location: Germany
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 Posted: Fri Oct 07, 2016 10:54 pm Post subject: initramfs does not find the root block device in . |
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hello gentoo community!
on a freshly installed system i encountered a bug regarding the initramfs boot mechanism.
the initramfs img was build via 'root #genkernel --install initramfs' (seperate file/not emerged)
after selecting Gentoo in Grub2 it starts booting and after loading all necessary kernel modules the following occurs:
| Code: |
>> Determining root device ...
!! Could not find the root block device in .
!! Please specify another value or:
!! - press Enter for the same
!! - type "shell" for a shell
!! - type "q" to skip...
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!! booting /root is possible by entering '/dev/sda4' !!
(samsung evo 850 ssd 120gb, gpt, bios, grub2, manually build kernel, kde/plasma & auto dhcp configured inside the genkernel auto generated initramfs)
so specifying another value to boot gentoo - partition: sda4 - superuser
fdisk -l
| Code: |
/dev/sda1 2048 8191 6144 3M BIOS boot
/dev/sda2 8192 258047 249856 122M Linux File System
/dev/sda3 258047 8288255 8030208 3,8G Linux File System
/dev/sda4 8288256 68524031 60235776 28,7G Linux File System
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blkid shows types: sda2=ext2, sda4=ext4, sda3=swap, sda1=none
/etc/fstab (located on partition: sda4)
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/dev/sda2 /boot ext2 defaults,noatime 0 2
/dev/sda4 / ext4 noatime,discard 0 1
/dev/sda3 none swap sw,discard 0 0
/dev/cdrom /mnt/cdrom auto noauto,user 0 0
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ls
folders: bin,boot,dev,etc,home,lib,lib32,lib64,ment,opt,proc,root,run,sbin,sys,tmp,usr,var
fstab - sda2 to sda4
ls /boot
files: config-4.4.21-gentoo, initramfs-genkernel-x86_64-4.4.21-gentoo, System.map-4.4.21-gentoo, vmlinuz-4.4.21-gentoo
folders: grub
questions:
how is it possible to specify the value '/dev/sda4' into initramfs? (want to maintain current system with seperate linux boot partition)
rm / rebuilding 'root #genkernel --install initramfs' does not work
which genkernel parameter should be used to achieve that?
is there another approach to fix the described issue?
Please answer with some explanation, so that i can really understand what went wrong.
Generally, i think the kernel & grub2 are just fine due to boot attemps & possible manual boot.
Thx for your answers! |
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russK
l33t
Joined: 27 Jun 2006
Posts: 665
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| Posted: Sat Oct 08, 2016 12:39 am Post subject: |
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I'm used to using genkernel-next, but I think genkernel is the same or similar in taking a '--real-root' argument. And I don't remember if grub2 is default install but I use grub2 (sys-boot/grub:2).
In /etc/default/grub, I have:
| Code: | | GRUB_CMDLINE_LINUX="rootfstype=ext4" |
My commands are usually,
| Code: | # genkernel --menuconfig --real-root=<devname> all
# grub-mkconfig -o /boot/grub/grub.cfg |
HTH |
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xombael
n00b
Joined: 07 Oct 2016
Posts: 6
Location: Germany
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| Posted: Sat Oct 08, 2016 12:56 am Post subject: |
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thx for the fast reply!
as mentioned the bug was initramfs related
typed the following:
root # rm initramfs..
root # genkernel --install --real-root=/dev/sda4 initramfs
everything works fine now! what a nice forum, definetly great!
looking forward to dive deeper into gentoo now  |
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