Re: [gentoo-user] /dev/sda* missing at boot

[Mark Knecht]

On Thu, Aug 18, 2011 at 11:59 AM,  <frares@×××××.com> wrote:
> Hi, guys
>
> It is a shame, I know, but after several years using Gentoo, it is the first
> time I try to build a kernel without "genkernel".
>
> And now I can't boot to that new kernel, it does not find (and really do not
> have a) /dev/sda* root partition ("real-root"); during the boot it stops,
> complaining about that, gives me the option to get a shell, from which I am
> able to see that there is no /dev/sda* .
>
> I have included everything SATA, so it looks like that is not a kernel
> problem, but a initramfs issue, I guess.
>
> What am I missing?
>
> Thanks a lot
> Francisco
>
> P.S.: my boot partition is sda2, sda3 is a swap partition, and everything
> else is in sda4. sda1 is not used (up to now) and this is my grub.conf :
>
> title Gentoo Linux 2.6.39-gentoo-r3
> root (hd0,1)
> kernel /boot/kernel-genkernel-x86_64-2.6.39-gentoo-r3 ro root=/dev/ram0
> init=/linuxrc real_root=/dev/sda4 vga=0x318 video=uvesafb:1024x768-32
> nodevfs udev devfs=nomount quiet CONSOLE=/dev/tty1
> initrd /boot/initramfs-genkernel-x86_64-2.6.39-gentoo-r3

Maybe I'm missing the obvious here but have you taken a copy of
whatever config file was used/generated by genkernel and used that as
a jumping off point for building your own kernel. kernel's a kernel's
a kernel. What it is capable of doing is in the .config file. If
genkernel doesn't give you a .config file - I've never used genkernel
so I don't know what it does - then assuming you have the feature
turned on you can get the running config using zcat /proc/config.gz.
Save that to a new .config file, put it in the kernel source directory
and you should be good to go.

You can also use zcat /proc/config.gz on the install CD kernel if yuo
boot from that. Save it to a disk and use it as the basis for creating
your own config.

HTH,
Mark