When converting from IDE to AHCI in the BIOS to include additional drives, I would get a kernel panic... as by default the bios was setup with the drives as IDE.
Booted using existing IDE and created a new kernel image with support for AHCI via the --preload option to manually specify modules support:
# mkinitrd --allow-missing --preload=ahci --force-scsi-probe /boot/initrd-`uname -r`-custom.img `uname -r`Then create a new grub boot option to load the new custom kernel image and select it when grub boots up using AHCI.
