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chaseis4344
n00b
Joined: 12 Sep 2024
Posts: 1
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 Posted: Thu Sep 12, 2024 2:14 pm Post subject: GRUB refuses to stop generating EFI entries |
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Hey,
I have installed Gentoo successfully with 1 small hiccup.
GRUB refuses to generate a /boot/grub/grub.cfg that uses MBR.
This issues causes my system to boot into the grub screen every boot.
This all happened because I was making my system UEFI based on the idea that the older system I was working on probably had the right firmware for UEFI mode.
I was wrong.
Now since I followed the handbook and enabled the UEFI flag for grub in the configs grub-mkconfig refuses to generate a non-UEFI boot.
I can get it to boot by specifying where vmlinuz and initramfs are, but it has never booted like it has when I installed arch
sorry if this post is uninformed, I am entirely new to gentoo |
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sabayonino
Veteran
Joined: 03 Jan 2012
Posts: 1023
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| Posted: Thu Sep 12, 2024 3:38 pm Post subject: |
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Hi.
BIOS boot works only with DOS disc table not GPT table
or you need the hybrid boot MBR+UEFI .
you need a small partition marked as bios_boot to install grub for MBR boot on GPT table disk
Hybrid MBR+UEFI boot disk partition schema
| Code: |
Disk /dev/sde: 223,57 GiB, 240057409536 bytes, 468862128 sectors
Disk model: Name
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 700981BF-1069-491E-B47C-B3CA35C35A5C
/dev/sde1 2048 4095 2048 1M BIOS boot
/dev/sde2 4096 208895 204800 100M EFI System
/dev/sde3 208896 468860927 468652032 223,5G Linux filesystem
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_________________
LRS i586 on G.Drive
LRS x86-64 EFI on MEGA
Last edited by sabayonino on Thu Sep 12, 2024 3:46 pm; edited 2 times in total |
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sMueggli
Guru
Joined: 03 Sep 2022
Posts: 445
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| Posted: Thu Sep 12, 2024 3:41 pm Post subject: Re: GRUB refuses to stop generating EFI entries |
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| chaseis4344 wrote: | | GRUB refuses to generate a /boot/grub/grub.cfg that uses MBR. |
Not sure, what you mean. Based on the partition table, Grub is loading the specific module. If the partition table is MBR than it will load the module for MBR. If the partition table is GPT it will load the module for GPT. But this depends on the partition table and not the boot mode.
Probably you mean the boot mode? That you want to boot in BIOS Legacy mode instead of UEFI?
| chaseis4344 wrote: |
This issues causes my system to boot into the grub screen every boot.
This all happened because I was making my system UEFI based on the idea that the older system I was working on probably had the right firmware for UEFI mode.
I was wrong.
Now since I followed the handbook and enabled the UEFI flag for grub in the configs grub-mkconfig refuses to generate a non-UEFI boot.
I can get it to boot by specifying where vmlinuz and initramfs are, but it has never booted like it has when I installed arch
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Please show the complete /boot/grub/grub.cfg and post the output of
| Code: | efibootmgr
grep GRUB /etc/portage/make.conf |
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sMueggli
Guru
Joined: 03 Sep 2022
Posts: 445
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| Posted: Thu Sep 12, 2024 3:47 pm Post subject: |
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| sabayonino wrote: | Hi.
BIOS boot works only with DOS disc table not GPT table
or you need the hybrid boot GPT+UEFI .
you need a small partition marked as bios_boot to install grub for DOS boot |
That's wrong/mixed.
- BIOS Legacy mode
- MBR: no special setting needed
- GPT: a bios_grub partition is needed to be able to install Grub
- UEFI mode
- MBR: The ESP should be a primary partition
- GPT: no special setting needed
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alamahant
Advocate
Joined: 23 Mar 2019
Posts: 3909
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| Posted: Thu Sep 12, 2024 7:45 pm Post subject: |
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Just comment out
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#GRUB_PLATFORMS="efi-64"
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in make.conf
then
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emerge -1av grub
grub-install /dev/sdx
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If your disk is gpt then create an 1M partition with
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Select partition type BIOS boot for fdisk.
Select partition type code ef02 for gdisk.
For parted set/activate the flag bios_grub on the partition.
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flag set.
BEFORE reinstalling grub.
Plz post
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Installing Gentoo
