Currently i am trying to work with my kernel : I am trying to make my chipset(ICH7 - M) to support AHCI in my debian 6 (linux-source-2.6.32). With mentioned link's ref :http://tartarus.org/~ds/quirk-ich-force-ahci.patch <http://tartarus.org/%7Eds/quirk-ich-force-ahci.patch> i cooked the quirk.c in my work machine and compiled the KERNEL make SUBDIRS=drivers/pci/ and make module SUBDIRS=drivers/pci/ After successful compilation i copied the "pci-stub.ko" from linux-source-2.6.32/drivers/pci to test machine's :"/lib/modules/2.6.32-5-686/kernel/drivers/pci" path and then set quirks.ich_force_ahci=1 in /etc/grub/grub.conf and rebooted the system But after reboot my IDE is using ata_PIIX driver not AHCI driver. Don't know what is error.request some guidance on applying the patch Regards Venkat.S