- keep the modes supported by the drive in struct ata_drive_datas (will be later used for downgrading the DMA/PIO mode on error) - use config flags to force/disable PIO/DMA/UDMA modes - For the CMD PCI0643/6 setup DMA mode to DMA Read multiple.
"wd0: PIO mode 4, DMA mode 2, UDMA mode 2" device.