PIIX_UDMACTL_DRV_EN 2586 dev/pci/pciide.c 		udmareg &= ~(PIIX_UDMACTL_DRV_EN(channel, drive) |
PIIX_UDMACTL_DRV_EN 2660 dev/pci/pciide.c 			udmareg |= PIIX_UDMACTL_DRV_EN( channel, drive);