I think the right way to fix this problem is the following:

In the kernel config file the CONFIG_SATA_AHCI must be 'y', if you maintain this variable with 'm' the problem occurs. For this you need to put the CONFIG_ATA=y and then put the CONFIG_SATA_AHCI=y. It's all.

In the grub.conf and fstab you don't need to use hdaX, you can keep the sdaX.

I'm having the same problem so wouldn't like to open a new thread....

The problem is with with LFS i'm working on recently because my motherboard is toast and i had to change it...
the result is this error

So in order to fix this i must boot with the LFS distro cd , mount the hd , chroot to it and recompile kernel with the new adjustments;

Thank you very much, this actually helped to fix my problem, i had to recompile the kernel without the ahci sata support...

After that it booted just fine...

I managed to resolve this issue by upgrading linux (to the same version running) using the recover disc.

Using a Centos 5.7 recover disc I did the following.

1. On the welcome screen type: linux upgradeany

2. Followed the instructions on the upgrade wizard, rebooted and logged in as normal.



In preparation for the upgrade I needed to ensure that there was enough space in the /boot partition.

1. I logged into my system using a CentOS 5.7 installation disc, used the command: linux rescue
2. Used the chroot command to login into mounted file system /mnt/sysimage
3. Used the command: rpm -e to remove unnecessary kernels installed on the machine

Hope this helps