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Document the CMD640 option.

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PR:	kern/3742
Submitted by:	helbig@MX.BA-Stuttgart.De
This commit is contained in:
Philippe Charnier 1997-07-15 09:44:05 +00:00
parent a296cb3019
commit 9e14ab4ed6
1 changed files with 11 additions and 1 deletions
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12
share/man/man4/man4.i386/wd.4
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@ -24,7 +24,7 @@
.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
.\"
.\" $Id$
.\" $Id: wd.4,v 1.5 1997/03/07 02:50:00 jmg Exp $
.\"
.Dd August 31, 1994
.Dt WD 4 i386
@ -37,6 +37,9 @@ Generic WD100x/IDE diskcontroller driver
.Cd "controller wdc0 at isa? port" \&"IO_WD1\&" bio irq 14 vector wdintr
.Cd "disk wd0 at wdc0 drive 0
.Cd "disk wd1 at wdc0 drive 1
.Pp
For the CMD640b IDE controller:
.Cd "options" \&"CMD640\&"
.Sh DESCRIPTION
This driver provides access to disks connected to controllers that emulate
the Western Digital WD100x series. This range of controllers includes WD1003
@ -69,6 +72,13 @@ sectors attempted is (flags & 0x00ff).
The flags can be specified on the line for the drive as a 16 bit int,
or on the controller line as a 32 bit int, where the top 16 bit is
relevant to the highest numbered drive.
.Pp
The
.Dq Dv CMD640
configuration option
enables a workaround for a deficiency of the CMD640b IDE controller.
If this option is enabled and the chip is detected by the PCI subsystem,
the primary and secondary controller will not be used simultaneously.
.Sh FILES
.Bl -tag -width Pa -compact
.It Pa /dev/wd*