compatible hard disk driver
wd* at wdc? flags 0x0000
wd* at pciide? flags 0x0000
driver supports hard disks which emulate the
Western Digital WD100x. This includes standard MFM, RLL, ESDI, IDE, and EIDE
drives, as well as Serial ATA drives, and PCMCIA/CF storage media.
are used only with controllers that
support DMA operations and mode settings (like some
controllers). The lowest order (rightmost) nibble of the
define the PIO mode to use. The next four
bits indicate the DMA mode and the third nibble the UltraDMA mode.
For each set of four bits, the 3 lower bits define the mode to use and the last
bit must be set to 1 for this setting to be used. For DMA and UltraDMA, 0xf
(1111) means “disable”. For example, a
value of 0x0fac (1111 1010 1100) means
“use PIO mode 4, DMA mode 2, disable UltraDMA”. The special
setting 0x0000 means “use whatever the drive claims to support”.