Gentoo GRUB Questions

**cheetahman** · 05-30-2006

Bootloader Configuration

To set up genkernel to work with your bootloader, three or four changes should be applied to the bootloader's configuration file:
Found these

1. Add root=/dev/ram0 and init=/linuxrc to the kernel parameters passed to the kernel image.

2. Add real_root=/dev/hda7, for example, to the kernel parameters passed to the kernel image, if /dev/hda7 contains your root partition.

3. If you are using bootsplash, add a suitable mode line such as vga=0x317 to the parameters passed to the kernel and also add splash=verbose or splash=silent depending on the verboseness you require from your bootloader.
What is verboseness

4. Add the initrd information as required by the bootloader. Consult the Bootloader Configuration Chapter of the Gentoo Handbook for details on how to make your bootloader initrd-aware.

title=Gentoo Linux 2.6.12-r10
root (hd0,0)
kernel /boot/kernel-genkernel-x86-2.6.12-gentoo-r10 root=/dev/ram0 init=/linuxrc ramdisk=8192 real_root=/dev/hda3 udev
initrd /boot/initramfs-genkernel-x86-2.6.12-gentoo-r10

So I need to add real_root=/dev/hda7 udev and what about ramdisk=8192

genkernel users should know that their kernels use the same boot options as is used for the Installation CD. For instance, if you have SCSI devices, you should add doscsi as kernel option.

**psic** · 05-30-2006

Originally Posted by cheetahman

title=Gentoo Linux 2.6.12-r10
root (hd0,6)
kernel /boot/kernel-genkernel-x86-2.6.12-gentoo-r10 root=/dev/ram0 ro init=/linuxrc ramdisk=8192 real_root=/dev/hda7 udev
initrd /boot/initramfs-genkernel-x86-2.6.12-gentoo-r10

This should work. Yes, you need the real_root=... in there. Also, Suse's fstab doesn't matter, gentoo's does (/dev/hda7/etc/fstab).

**cheetahman** · 05-31-2006

Originally Posted by psic

This should work. Yes, you need the real_root=... in there. Also, Suse's fstab doesn't matter, gentoo's does (/dev/hda7/etc/fstab).

How can I access the fstab in Gentoo if I can't boot into it

**budman7** · 05-31-2006

Just boot up with your Gentoo livecd and chroot into your installation.
Check the handbook for the necessary details on chrooting.

**cheetahman** · 05-31-2006

The kernel works now but I can't log into Gentoo it rejects my username and password.

**spencerf** · 05-31-2006

log in as root
enter password

Code:

useradd -G usb,wheel,video,audio -s /bin/bash username
passwd username

enter new password

**cheetahman** · 05-31-2006

it won't log me in as root and won't accept my root password

**spencerf** · 05-31-2006

you probably forgot to set one during your install. Go back through the process you used to chroot. Once in the chroot just enter

passwd
[enter new root passwd]

then add new user if you haven't done so
then reboot

**budman7** · 05-31-2006

To chroot from the Gentoo livecd, just do

Code:

mount /dev/hda7 /mnt/gentoo
chroot /mnt/gentoo /bin/bash

**cheetahman** · 05-31-2006

Would I do this in the terminal

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