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Grub2 and os-prober not detect os
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Marcofras
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PostPosted: Fri Oct 18, 2024 7:10 pm    Post subject: Grub2 and os-prober not detect os Reply with quote
Im installing new os no multilib amd64 and grub-mkconfig no prompt the lines with directory of vmlinuz i have in boot directory.
I installed os-prober too with mount and /etc/default/grub line.
My bios is uefi bios and grub screen shows only one choose with firmware uefi that bring me in the uefi bios screen.
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pietinger
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PostPosted: Fri Oct 18, 2024 7:22 pm    Post subject: Re: Grub2 and os-prober not detect os Reply with quote
Marcofras wrote:
Im installing new os no multilib amd64 and grub-mkconfig no prompt the lines with directory of vmlinuz i have in boot directory.

Your manually built kernel must have a specific name schema for beeing detected by grub-mkconfig.
Try:
Code:
cp /usr/src/linux/arch/x86/boot/bzImage /boot/vmlinuz-X.Y.Z-gentoo

(and then of course a grub-mkconfig again)

( See also: https://wiki.gentoo.org/wiki/User:Pietinger/Tutorials/Manual_kernel_configuration#Cheat_Sheets )
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Marcofras
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PostPosted: Sun Oct 20, 2024 11:41 am    Post subject: Reply with quote
I will try soon.
Again i read about efibootmgr, does it need grub for write efi partition anyway?
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pietinger
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PostPosted: Sun Oct 20, 2024 1:45 pm    Post subject: Reply with quote
Marcofras wrote:
[...] does it need grub for write efi partition anyway?

No. You will need access to your ESP for grub only when you install grub (with grub-install) because the first part of grub will be copied to \efi\gentoo\grubx64.efi (the 2nd part of grub will be in /boot/grub/..). So, if you do a "grub-mkconfig" grub needs only acces to /boot/grub/grub.cfg.
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Marcofras
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PostPosted: Sun Oct 20, 2024 3:17 pm    Post subject: Reply with quote
Ok, i read the guide efibootmgr and it use the files in efi partition if i dont have grub where find it that files?
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pietinger
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PostPosted: Sun Oct 20, 2024 3:47 pm    Post subject: Reply with quote
Marcofras wrote:
Ok, i read the guide efibootmgr and it use the files in efi partition if i dont have grub where find it that files?

You have in your ESP either a binary which is a bootloader/bootmanager (like grubx64.efi) OR you have a (stub)-kernel which will be started bei UEFI directly. Maybe read:
https://wiki.gentoo.org/wiki/User:Pietinger/Tutorials/Boot_kernel_via_UEFI
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