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Document the flags.

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This commit is contained in:
Poul-Henning Kamp 1996-07-21 09:29:25 +00:00
parent 7c60604ada
commit bba48fb88d
1 changed files with 26 additions and 2 deletions
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28
share/man/man4/man4.i386/wd.4
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@ -31,10 +31,10 @@
.Sh NAME
.Nm wd
.Nd
Generic WD100x diskcontroller driver
Generic WD100x/IDE diskcontroller driver
.Sh SYNOPSIS
.sp
.Cd "controller wdc0 at isa? port" \&"IO_WD1\&" bio irq 14 vector wdintr
.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
.sp
@ -46,6 +46,30 @@ controllers found on most motherboards.
.sp
Your controller documentation is usually quick to point out any WD100x
compatibility.
.sp
You can convey a number of hints and instructions to the driver using
the
.Ar flags
parameter.
.sp
For each drive there are four bit-fields encoded in a 16 bit integer:
.Bl -tag -width 0x0000 -offset 1c
.It 0x8000
Test and use the 32bit transfer capability of the drive.
.It 0x4000
If drive looks like it's comming out of sleep mode, assume it's
confused and reinitialize it.
.It 0x0f00
Force number of heads to ((flags & 0xf00)>>8), recalculate number
of cylinders to match.
.It 0x00ff
Test and use multi-sector transfer mode of this drive, max number of
sectors attempted is (flags & 0x00ff).
.El
.sp
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.
.Sh FILES
.Bl -tag -width Pa -compact
.It Pa /dev/wd*