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pgu
l33t
Joined: 30 Jul 2009
Posts: 721
Location: Oslo, Norway
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 Posted: Fri Dec 29, 2023 3:20 pm Post subject: [SOLVED] gpt non-EFI (rootfs on raid) grub problems |
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I'm trying to set up a lecacy system without EFI using gpt partition table and rootfs on raid1(mdadm)
This is the partition table:
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Device Start End Sectors Size Type
/dev/sda1 2048 2099199 2097152 1G BIOS boot
/dev/sda2 2099200 136316927 134217728 64G Linux swap
/dev/sda3 136316928 220203007 83886080 40G Linux RAID
/dev/sda4 220203008 234452991 14249984 6.8G Linux RAID
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Installing grub appears to be ok:
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(chroot) livecd / # grub-install --modules=part_gpt /dev/sda
Installing for i386-pc platform.
Installation finished. No error reported.
(chroot) livecd / # grub-mkconfig -o /boot/grub/grub.cfg
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-6.1.67-gentoo
Found initrd image: /boot/initramfs-6.1.67-gentoo.img
done
(chroot) livecd / # tail -5 /etc/default/grub
# to know when they can make a choice on the menu.
#GRUB_INIT_TUNE="60 800 1"
GRUB_CMDLINE_LINUX_DEFAULT="domdadm"
GRUB_DISABLE_OS_PROBER=false
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Unfortunatly, when I boot I only get
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Loading Operating System ...
GRUB
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and then it hangs until I reset or power cycle the host. However, if I boot from the Gentoo install stick and enter the linux and initrd commands, but prefix the filename paths by (hd1,gp1) then it will start to boot.
This is when using ext2 for the boot partition. If I use xfs (like in the handbook) I always get:
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(chroot) livecd /usr/src/linux # grep xfs /proc/filesystems
xfs
(chroot) livecd /usr/src/linux # grub-install --modules=part_gpt /dev/sda
Installing for i386-pc platform.
Installation finished. No error reported.
(chroot) livecd /usr/src/linux # tail -3 /etc/default/grub
GRUB_CMDLINE_LINUX_DEFAULT="domdadm"
GRUB_DISABLE_OS_PROBER=false
(chroot) livecd /usr/src/linux # grub-mkconfig -o /boot/grub/grub.cfg
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-6.1.67-gentoo
Found initrd image: /boot/initramfs-6.1.67-gentoo.img
/usr/sbin/grub-probe: error: unknown filesystem.
cat: /boot/grub/grub.cfg.new: Input/output error
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Any ideas on how to resolve this?
Last edited by pgu on Sat Dec 30, 2023 4:21 am; edited 1 time in total |
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NeddySeagoon
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Joined: 05 Jul 2003
Posts: 54450
Location: 56N 3W
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| Posted: Fri Dec 29, 2023 5:08 pm Post subject: |
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pgu,
Where is your /boot?
| Code: | Device Start End Sectors Size Type
/dev/sda1 2048 2099199 2097152 1G BIOS boot |
should be 2MB for Grub to use raw, for itself. No filesystem.
Its not yours.
The GRUB prompt means that grub cannot find its grub.cfg
A read of The Olde Way may aid understanding.
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Regards,
NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
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pgu
l33t
Joined: 30 Jul 2009
Posts: 721
Location: Oslo, Norway
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| Posted: Fri Dec 29, 2023 6:08 pm Post subject: |
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| Thanks. I though it was using space in the filesystem itself. I'll try to re-partition it if it has to be a dedicated partition. |
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pgu
l33t
Joined: 30 Jul 2009
Posts: 721
Location: Oslo, Norway
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| Posted: Fri Dec 29, 2023 6:11 pm Post subject: |
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| BTW Does this "BIOS Boot" partition have to be at the beginning of the disk or could it be placed at the end of the drive, e.g. on a 2TB drive? |
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GDH-gentoo
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Joined: 20 Jul 2019
Posts: 1569
Location: South America
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| Posted: Fri Dec 29, 2023 6:19 pm Post subject: |
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| pgu wrote: | | BTW Does this "BIOS Boot" partition have to be at the beginning of the disk or could it be placed at the end of the drive, e.g. on a 2TB drive? |
I don't think that location on the disk matters. It is only used by GRUB (automatically) and likely recognized by its Partition Type GUID.
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| NeddySeagoon wrote: | I'm not a witch, I'm a retired electronics engineer  |
| Ionen wrote: | | As a packager I just don't want things to get messier with weird build systems and multiple toolchains requirements though |
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NeddySeagoon
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Joined: 05 Jul 2003
Posts: 54450
Location: 56N 3W
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| Posted: Fri Dec 29, 2023 6:37 pm Post subject: |
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pgu,
It has to be where the BIOS can read it.
As different BIOSes have different limitations, putting in the start of the drive is safe and has become a tradition, for the same reason that /boot is at the start of the drive.
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Regards,
NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
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pgu
l33t
Joined: 30 Jul 2009
Posts: 721
Location: Oslo, Norway
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| Posted: Sat Dec 30, 2023 4:20 am Post subject: |
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| NeddySeagoon wrote: |
As different BIOSes have different limitations, putting in the start of the drive is safe and has become a tradition, for the same reason that /boot is at the start of the drive. |
Thanks again, after using this gpt partition scheme I was able to install and boot:
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Disklabel type: gpt
Disk identifier: 65CEC858-95FA-C146-B83A-D1BE2C315B2D
Device Start End Sectors Size Type
/dev/sda1 2048 264191 262144 128M BIOS boot
/dev/sda2 264192 2099199 1835008 896M Linux filesystem
/dev/sda3 2099200 136316927 134217728 64G Linux swap
/dev/sda4 136316928 220203007 83886080 40G Linux RAID
/dev/sda5 220203008 234452991 14249984 6.8G Linux RAID
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GPT Non-EFI partitions software raid bios boot Linux |
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Installing Gentoo
