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I've a Debian in my computer and now I want to add a Gentoo distro. I've installed Gentoo by terminal in Debian and chrooted to Gentoo in order to emerge all packages.

Now, I added Gentoo to Grub (installed on Debian) and for that I used the command:

root@reborn:/home/jota# grub-mkconfig -o /boot/grub/grub.cfg Generating grub configuration file ... Found background image: /usr/share/images/desktop-base/desktop-grub.png Encontrada imagen de linux: /boot/vmlinuz-3.16.0-4-amd64 Encontrada imagen de memoria inicial: /boot/initrd.img-3.16.0-4-amd64 Encontrado Gentoo Base System release 2.3 en /dev/sda3 hecho root@reborn:/home/jota#

So it works ok. When I reboot I have the new entry of Gentoo but when is booting the system halts with kernel panic error

Kernel panic - not synching:VFS:Unable to mount root fs on unknown-block(0,0)

The part of grub.cfg seems ok,

menuentry 'Gentoo Base System release 2.3 (en /dev/sda3)' --class gnu-linux --class gnu --class os $menuentry_id_option 'osprober-gnulinux-simple-f40f428c-f76d-489f-9d97-a259f34ed457' { insmod part_msdos insmod ext2 set root='hd0,msdos3' if [ x$feature_platform_search_hint = xy ]; then search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos3 --hint-efi=hd0,msdos3 --hint-baremetal=ahci0,msdos3 f40f428c-f76d-489f-9d97-a259f34ed457 else search --no-floppy --fs-uuid --set=root f40f428c-f76d-489f-9d97-a259f34ed457 fi linux /boot/vmlinuz-4.4.39-gentoo root=/dev/sda3 ro }

fdisk output is:

 Device Boot Start End Sectors Size Id Type /dev/sda1 2048 97656831 97654784 46,6G 83 Linux /dev/sda2 97656832 116088831 18432000 8,8G 82 Linux swap / Solaris /dev/sda3 * 116088832 218488831 102400000 48,8G 83 Linux

Where sda1 is Debian /, sda2 is swap for both Debian and Gentoo, and sda3 is Gentoo /

I've tried to change the boot flag trough sda1 and sda3 with no changes.

And the fstab file of Gentoo is:

 /dev/sda3 / ext4 errors=remount-ro 0 1 /dev/sda2 none swap sw 0 0

Edit: As mentioned in comments, Gentoo doesn't generate initrd.img file, I've never needed it before.

 root@reborn:/boot# ls /boot/ config-3.16.0-4-amd64 grub initrd.img-3.16.0-4-amd64 System.map-3.16.0-4-amd64 vmlinuz-3.16.0-4-amd64 root@reborn:/boot# ls /mnt/gentoo/boot/ config-4.4.39-gentoo config-4.4.39-gentoo.old grub System.map-4.4.39-gentoo System.map-4.4.39-gentoo.old vmlinuz-4.4.39-gentoo vmlinuz-4.4.39-gentoo.old root@reborn:/boot#
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  • Your grub.cfg menuentry is missing the initrd /initrd.img-3.16.0-4-amd64 (or similar) line. Not sure why though considering grub-mkconfig clearly found it (from the messages it generated) Commented Feb 1, 2017 at 18:17
  • if Gentoo isn't using initramfs, then are you sure you built the correct modules in to the kernel? Check your boot messages to make sure that sda is actually being discovered. Commented Feb 1, 2017 at 22:29

1 Answer 1

Reset to default
3

It was kernel driver problem. Need to add a driver for PATA controller.

CONFIG_PATA_ATIIXP=y

I found it by lshw command

*-ide description: IDE interface product: SB7x0/SB8x0/SB9x0 IDE Controller vendor: Advanced Micro Devices, Inc. [AMD/ATI] physical id: 14.1 bus info: pci@0000:00:14.1 version: 40 width: 32 bits clock: 66MHz capabilities: ide bus_master configuration: driver=**pata_atiixp** latency=32
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  • Please if your kernel panic is gone, you r able to boot normally. Mark your own answer as accepted one. Commented May 10, 2021 at 17:43

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