79 lines
3.1 KiB
Groff
79 lines
3.1 KiB
Groff
.\"
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.\" Copyright (c) 1994 Wilko Bulte
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. The name of the author may not be used to endorse or promote products
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.\" derived from this software withough specific prior written permission
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd August 31, 1994
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.Dt FDC 4
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.Os FreeBSD
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.Sh NAME
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.Nm fdc
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.Nd PC architecture floppy disk controller driver
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.Sh SYNOPSIS
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.Cd "device fdc0 at isa? port IO_FD1 flags 0x1 irq 6 drq 2"
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.Cd device fd0 at fdc0 drive 0
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.Cd device fd1 at fdc0 drive 1
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.Sh DESCRIPTION
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This driver provides access to floppy disk drives.
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In /dev for each floppy device a number of minor devices are present.
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The
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/dev/fd* devices with trailing alphabetic characters are used to indicate
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.Sq partitions
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on the floppy disk.
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The /dev/fd*.<number> are devices that
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indicate the size of the floppy disk (so: 720kB, 1440kB etc). The latter
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are used for formatting disks using fdformat or for accessing different
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density disks in multidensity drive.
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Example: 720kB disk in a 1.44Mb drive.
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.Pp
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Normally, the driver will ask the system's CMOS memory to obtain the
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floppy drive configuration. Some machines do not store any form of a
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configuration value in their CMOS. Use the flags value
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.Ql 0x1
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to pretend a 1.44 MB floppy drive as the first unit, without asking the
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CMOS for it.
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.Pp
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Normally, the device driver detects FDC chipsets that have an internal
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FIFO, and enables the FIFO on them. There is a slight chance that this
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feature is actually misdetected (seen on an IBM Thinkpad 755c), so it
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can be turned off using flags
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.Ql 0x4 .
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.Sh FILES
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.Bl -tag -width Pa -compact
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.It Pa /dev/fd*
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floppy disk device nodes
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.It Pa /dev/fd*. Ns Ar "<size in kB>"
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floppy disk device nodes where the trailing number indicates the floppy
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capacity
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.It Pa /sys/i386/conf/GENERIC
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sample generic kernel config file
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.It Pa /sys/isa/fd.c
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floppy driver source
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.El
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.Sh SEE ALSO
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.Xr fdformat 1 ,
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.Xr disktab 5
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