Loading scsi modules thusly without any ide modules:

echo Installing ide modules
echo Installing scsi modules
insmod /lib/scsi_mod.o
insmod /lib/sd_mod.o
insmod /lib/aic7xxx.o
echo Installing libata
insmod /lib/libata.o
insmod /lib/ata_piix.o
insmod /lib/ide-scsi.o
echo Installing usb modules
insmod /lib/usbcore.o
insmod /lib/ehci-hcd.o
insmod /lib/usb-uhci.o
insmod /lib/usb-storage.o

Yields the following syslog (attached as file Kernel-002.log)