man : wdc(4)
WDC(4) OpenBSD Programmer's Manual WDC(4)
wdc - WD100x compatible hard disk controller driver
wdc0 at isa? port 0x1f0 irq 14 flags 0x00
wdc1 at isa? port 0x170 irq 15 flags 0x00
wdc* at isapnp?
wdc* at macobio?
wdc* at kauaiata?
wdc0 at obio? port 0x14000000 irq 10
# all architectures
wdc* at pcmcia?
atapiscsi* at wdc?* flags 0x0000
wd* at wdc? flags 0x0000
The wdc driver provides the basic functions for the wd(4) and
atapiscsi(4) drivers. It supports IDE and EIDE controllers, as well as
MFM, RLL, and ESDI on the ISA bus. PCI IDE controllers in legacy mode
are also supported, but the pciide(4) driver may provide more
For the isa(4) front-end, setting flags to 0x01 enables 32-bit I/O
negotiation. This is known to cause problems with some motherboards.
atapiscsi(4), intro(4), isa(4), isapnp(4), macobio(4), obio(4),
pciide(4), pcmcia(4), scsi(4), wd(4)
OpenBSD 4.9 May 31, 2007 OpenBSD 4.9