[SOLVED] Can't boot gentoo

Message

JKosta · Post by **JKosta** » Mon Jul 28, 2014 8:50 pm

Hello!

When I try to boot gentoo I get an error message.

If I use root=UUID=d903f1cb-573a-47c8-8b52-df930e354689 in the kernel line of file /boot/grub/grub.cfg I get: Unable to resolve root: UUID=d903f1cb-573a-47c8-8b52-df930e354689.

If I use root=PARTUUID=0001cf5c-02, I get: 0001cf5c-02 is an invalid root device.

If I use root=/dev/sda2, I get: /dev/sda2 is an invalid root device.

The Doctor · Post by **The Doctor** » Mon Jul 28, 2014 8:56 pm

Can you please provide some information about the setup?

I take it you have a disk, and it is partitioned where sda2 root (/)

What other partitions do you have? Is this in EFI mode? Are you using GPT or MBR partitions? What type of file system is root? Is this a genkernel or a manual one? Is grub turning control over to the kernel?

From what information you have here I would guess that your root is an exotic file system that grub can't read or you are missing file system support in your kernel.

JKosta · Post by **JKosta** » Mon Jul 28, 2014 9:06 pm

You're right sda2 is the root (/).

Code: Select all

$ blkid

/dev/sda2: UUID="d903f1cb-573a-47c8-8b52-df930e354689" TYPE="ext4" PTTYPE="dos" PARTUUID="0001cf5c-02" 
/dev/sda1: LABEL="windows" UUID="8810BF6110BF5542" TYPE="ntfs" PARTUUID="0001cf5c-01" 
/dev/sda10: UUID="28717a34-7d74-4c51-96f4-f49486336165" TYPE="swap" PARTUUID="0001cf5c-0a" 
/dev/sda5: LABEL="fedora" UUID="415d2d38-9dc1-4ef6-8187-d50560bbfd10" TYPE="ext4" PTTYPE="dos" PARTUUID="0001cf5c-05" 
/dev/sda6: LABEL="arch" UUID="c8ccbb27-a0ce-47f1-9a46-636cfc731cd8" TYPE="ext4" PTTYPE="dos" PARTUUID="0001cf5c-06" 
/dev/sda7: UUID="1b03c950-d78f-486f-89c7-2814262c55fa" TYPE="ext4" PTTYPE="dos" PARTUUID="0001cf5c-07" 
/dev/sda8: UUID="4d772572-2116-4b9e-b61d-8301008f9bd5" TYPE="ext4" PTTYPE="dos" PARTUUID="0001cf5c-08" 
/dev/sda9: UUID="d38b85e4-836a-4f67-8013-ef8bf0dc3370" TYPE="ext4" PTTYPE="dos" PARTUUID="0001cf5c-09" 
/dev/sdb1: UUID="38d75e93-8bf6-480d-bb71-b9c9db7beb8d" TYPE="ext4" PARTUUID="90909090-01"

This is not in EFI mode. MBR partitions.

I mixed. I ran make; make modules_install. Then I ran gemkernel --install initramfs.

The Doctor · Post by **The Doctor** » Mon Jul 28, 2014 9:15 pm

Okay the mixing the kernel like that might be the problem. It is perfectly possible to do, but there might be some assumptions built into the initramfs that aren't true.

What does grep EXT4 /usr/src/linux/.config show? CONFIG_EXT4_FS should be built in since it is your root file system.

JKosta · Post by **JKosta** » Mon Jul 28, 2014 9:35 pm

Code: Select all

$ grep EXT4 /media/gentoo/usr/src/linux/.config

CONFIG_EXT4_FS=y
CONFIG_EXT4_FS_POSIX_ACL=y
CONFIG_EXT4_FS_SECURITY=y
# CONFIG_EXT4_DEBUG is not set

JKosta · Post by **JKosta** » Mon Jul 28, 2014 9:46 pm

I recompiled the kernel using the command "genkernel all" and right now I'm answering you within my gentoo box.

Thank you very much!

The Doctor · Post by **The Doctor** » Mon Jul 28, 2014 9:52 pm

I'm not an expert in genkernel, but my guess is that the initramfs was trying to load a module that didn't exist. This is just speculation.

If you want to try manually configuring your kernel, may I recomend the instructions on this site? The seeds are old, but the advice is timeless. http://kernel-seeds.grytpype-thynne.org/working.html

JKosta · Post by **JKosta** » Mon Jul 28, 2014 10:35 pm

Thank you for your suggestion.