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tshade
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PostPosted: Sat Dec 17, 2022 3:04 pm    Post subject: grub-mkconfig does not detect any kernel Reply with quote

I have searched for help, but I have got no clue of what can be happening. I am installing Gentoo (it's not the first time, I have been active since many years), and I have configured and installed the kernel. Now, I try

Code:
grub-mkconfig -o /boot/grub/menu.cfg


But it only adds an entry for "UEFI Firmware Settings"

What can be wrong? I have three partitions on my GPT table, first, sda1, 500MB, EFI, second, sda2, swap, third, sda3, root, ext4.

My computer is a Lenovo Tiny which supports UEFI (and has it enabled, and legacy boot is disabled)

sda1 is mounted in /boot/, I'm in a jail, with everything mounted (proc, sys, dev, run). I have tried mounting sda1 on /boot/EFI, but it also does not work.

I have already configured, compiled and installed te latest kernel.

Any more information you need, please, tell me.
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Logicien
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PostPosted: Sat Dec 17, 2022 3:10 pm    Post subject: Reply with quote

Have you install os-prober for Grub to detect other systems. You can try Refind who is good too as a EFI bootloader. Is the path /boot/grub/menu.cfg or /boot/grub2/menu.cfg? On Gentoo Grub2 can be in the path.
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tshade
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PostPosted: Sat Dec 17, 2022 3:45 pm    Post subject: Reply with quote

I execute 'os-prober' and the result is empty. What am I doing wrong? BTW, /boot/ contains:

EFI, System.map, System.old, gentoo, grub (not grub2), vmlinuz, vmlinuz.old

And /boot/grub/ contains: fonts, grub.cfg, grubenv, locale, themes, x86_64-efi

I have compiled and installed os-prober, grub correctly detects it, but only efi-64 in GRUB_PLATFORMS.
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FilthyPitDog
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PostPosted: Sat Dec 17, 2022 9:40 pm    Post subject: Reply with quote

Make sure GRUB_PLATFORMS="efi-64" is in make.conf

then redo

grub-install --target=x86_64-efi --efi-directory=/boot
grub-mkconfig -o /boot/grub/grub.cfg
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tshade
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PostPosted: Sun Dec 18, 2022 4:10 pm    Post subject: Reply with quote

I have run the two commands, still no luck. Everything seems Ok, but grub does not detect any kernel.
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Logicien
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PostPosted: Sun Dec 18, 2022 4:41 pm    Post subject: Reply with quote

What are the permissions in
Code:
ls -al /etc/grub.d/

What's the contain of /etc/default/grub

You can create your own Grub menu entries in /etc/grub.d/40_custom, make it executable and run

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


Read the contain of /boot/grub/grub.cfg after grub-mkconfig can be helpfull of what the command did. If you mount sda1 in the /boot directory of Gentoo it change something. It normally go to /boot/efi. Other questions: do your rich the Grub menu when you boot the computer? Is there something in the menu?
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sabayonino
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PostPosted: Sun Dec 18, 2022 7:56 pm    Post subject: Reply with quote

Hi.
Is /boot mounted ? if Yes the EFI directory and its contents overlapped /boot

if you have /boot as "efi" directory , by default it is not mounted so the real /boot is on the / filesystem

I suggest to keep EFI filesystem separated from /boot

/boot ext4 ( or simply keep the /boot directory on / )
/boot/EFI directory FAT32-efi where to install the efi-firmware

Code:
# grub-install .... --efi-directory=/boot/EFI


EFI directory no need to be mounted so you can avoid to mount over fstab file


My conf is :
Code:

UUID=AF48-5865                                  /boot/efi       vfat    noauto        0 1
UUID=21184dd9-893a-4aa6-8007-eb2b2d938c1d       /       ext4    defaults,noatime,discard        0 1
UUID=5da6c362-2960-42cb-96f6-5c5795df84dc       /home   ext4    defaults,noatime,discard        0 2


Code:
blkid | grep sda
/dev/sda4: LABEL="fs_home" UUID="5da6c362-2960-42cb-96f6-5c5795df84dc" BLOCK_SIZE="4096" TYPE="ext4" PARTLABEL="fs_home" PARTUUID="b4d79c7a-d3bd-41e5-90fb-190cf6f023c5"
/dev/sda2: LABEL_FATBOOT="FS_EFI" LABEL="FS_EFI" UUID="AF48-5865" BLOCK_SIZE="512" TYPE="vfat" PARTLABEL="fs_efi" PARTUUID="437dfe8e-50b4-4f33-87ed-3b1895e8d21a"
/dev/sda3: LABEL="fs_root" UUID="21184dd9-893a-4aa6-8007-eb2b2d938c1d" BLOCK_SIZE="4096" TYPE="ext4" PARTLABEL="fs_root" PARTUUID="b27b9880-71ee-4af0-81d4-591f52ee8839"


/boot contents
Code:
ls /boot
 amd-uc.img                       grub                                    memtest86plus                        vmlinuz-5.15.80-gentoo-dist
 config-5.15.77-gentoo-dist       initramfs-5.15.77-gentoo-dist.img       System.map-5.15.77-gentoo-dist       vmlinuz-5.15.80-gentoo-dist.old
 config-5.15.80-gentoo-dist       initramfs-5.15.80-gentoo-dist.img       System.map-5.15.80-gentoo-dist
 config-5.15.80-gentoo-dist.old   initramfs-5.15.80-gentoo-dist.img.old   System.map-5.15.80-gentoo-dist.old
 efi                              intel-uc.img                            vmlinuz-5.15.77-gentoo-dist

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tshade
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PostPosted: Sun Dec 18, 2022 10:38 pm    Post subject: Reply with quote

All files in /etc/grub.d/ are executable, except the README, all owned by root.

/etc/default/grub: all lines are commented, except GRUB_DISABLE_OS_PROBER=false and GRUB_DISTRIBUTOR="Gentoo"

I still don't see anything wrong or inusual.
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grknight
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PostPosted: Mon Dec 19, 2022 12:58 am    Post subject: Reply with quote

tshade wrote:
I execute 'os-prober' and the result is empty. What am I doing wrong? BTW, /boot/ contains:

EFI, System.map, System.old, gentoo, grub (not grub2), vmlinuz, vmlinuz.old

And /boot/grub/ contains: fonts, grub.cfg, grubenv, locale, themes, x86_64-efi

I have compiled and installed os-prober, grub correctly detects it, but only efi-64 in GRUB_PLATFORMS.


Naming your kernel just vmlinuz is the issue. The default 10_linux script for grub expects a version after it such as the one created by 'make install'
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sMueggli
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PostPosted: Mon Dec 19, 2022 4:20 pm    Post subject: Re: grub-mkconfig does not detect any kernel Reply with quote

tshade wrote:

Code:
grub-mkconfig -o /boot/grub/menu.cfg



I think you should use
Code:
grub-mkconfig -o /boot/grub/grub.cfg

to avoid other problems (after fixing the real problem).
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tshade
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PostPosted: Mon Dec 19, 2022 6:12 pm    Post subject: Reply with quote

@sMueggli you're right, it's a typo.

It's now working, grub has detected the vmlinuz-5.15.75-gentoo kernel. But I wonder... why does it not automatically do it? I mean, kernel "make install". The Handbook recommends creating /dev/sda1 type vfat, partition type EFI to mount on /boot.

I guess this is not correct, it should mount /dev/sda1 on /boot/EFI, is it right?

I have selected the installed kernel to boot and get "Booting Gentoo GNU/Linux", "Loading Linux 5.15.75-gentoo", nothing more.

I'll try and change /dev/sda1 EFI partition, just in case.
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tshade
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PostPosted: Mon Dec 19, 2022 6:28 pm    Post subject: Reply with quote

I have changed boot partition to mount on /boot/EFI/, main sda3 partition contains everything else, including the kernel itself. No luck, I'm stuck in "Loading Linux 5.15.75-gentoo"...

I'm surprised the kernel itself has not append the version number to vmlinuz file, it's the first time I have to append it manually.
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grknight
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PostPosted: Mon Dec 19, 2022 6:32 pm    Post subject: Reply with quote

tshade wrote:
I have changed boot partition to mount on /boot/EFI/, main sda3 partition contains everything else, including the kernel itself. No luck, I'm stuck in "Loading Linux 5.15.75-gentoo"...

I'm surprised the kernel itself has not append the version number to vmlinuz file, it's the first time I have to append it manually.


You are not "stuck". The kernel is starting but you are unable to see anything without configuring a valid video driver to display to the screen.
UEFI does not have a text fall back to display anything until video is properly set.
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pietinger
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PostPosted: Mon Dec 19, 2022 6:34 pm    Post subject: Reply with quote

tshade,

you are probably missing framebuffer. See more in our "neighbour" thread: https://forums.gentoo.org/viewtopic-p-8764937.html#8764937
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pietinger
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PostPosted: Mon Dec 19, 2022 6:41 pm    Post subject: Reply with quote

tshade wrote:
It's now working, grub has detected the vmlinuz-5.15.75-gentoo kernel. But I wonder... why does it not automatically do it? I mean, kernel "make install". The Handbook recommends creating /dev/sda1 type vfat, partition type EFI to mount on /boot.

I guess this is not correct, it should mount /dev/sda1 on /boot/EFI, is it right?

[...]

I'll try and change /dev/sda1 EFI partition, just in case.

Please dont do it. GO with our AMD64 handbook. Mount your /dev/sda1 (=your ESP with FAT32) to /boot.

You have two choices:

1. You are using only a ESP (efi system partition) and mount it as /boot (you will have later: /boot/EFI/gentoo/grubx64.efi)

2. You are using two partition: One ESP and an additional for more boot stuff. THEN you must mount add. Partition as /boot. here you can make a directory efi. To this you mount your ESP (you will have later: /boot/efi/EFI/gentoo/grubx64.efi)

Needless to say, I dont recommend option 2.

Next: "make install" copies ONLY your kernel to /boot (nothing more). If you use grub you must tell grub to do a new configuration WITH this new kernel. Therefore I recommend to do ALWAYS a "grub-mkconfig -o /boot/grub/grub.cfg" afterwards.
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sMueggli
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PostPosted: Tue Dec 20, 2022 4:59 pm    Post subject: Reply with quote

There are more than two choices.

The handbook is not wrong, but is also not the only possible solution. The best solution depends on your needs.

You can (ab)use the EFI System Partition and mount it to /boot. But you can also have a separate /boot partition or you can use the existing /boot directory on your system root partition (also known as /).

The ESP must be formatted as FAT and has all the advantages and disadvantages of FAT.
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tshade
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PostPosted: Tue Dec 20, 2022 8:54 pm    Post subject: Reply with quote

Thank you, now, I'm having trouble with GRUB not detecting its config files /boot/grub/x86_64-efi/normal.mod not found

I have tried Boot repair disk, and no luck. Super Grub Disk allows me to boot the gentoo kernel, but I cannot use root, I will set the password by hand, sudo is not installed. I think I will set root password and boot using Super Grub Disk, then reinstalling grub.
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tshade
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PostPosted: Tue Dec 20, 2022 9:02 pm    Post subject: Reply with quote

BTW, the framebuffer now works, omg, this is so complicated... :-( I'm trying lots of things, no luck.
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luna80
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PostPosted: Wed Dec 21, 2022 6:10 am    Post subject: Reply with quote

maybe is a stupid question bu did you launch

Code:
make install


after compiling the kernel, the kernel is present in /boot?
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tshade
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PostPosted: Wed Dec 21, 2022 3:19 pm    Post subject: Reply with quote

Of course, I have executed make install... It has installed the kernel in /boot/vmlinuz, which is not correct (it should append it's version). Strange thing: I have compiled and installed Gentoo many times and I have never seen this problem, I mean, kernel always installs in /boot/vmlinuz-[version]. I think I will wait until I get a different point of view. The clue might be somewhere... I am making a [probably stupid] mistake, so your comment is completely relevant.
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pietinger
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PostPosted: Wed Dec 21, 2022 3:57 pm    Post subject: Reply with quote

tshade wrote:
[...] It has installed the kernel in /boot/vmlinuz, which is not correct (it should append it's version). Strange thing: I have compiled and installed Gentoo many times and I have never seen this problem, I mean, kernel always installs in /boot/vmlinuz-[version].

Do you have both empy ? (If not, do it)
Code:
General setup  --->
    ()  Local version - append to kernel release
    [ ] Automatically append version information to the version string
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