1.\" 2.\" Copyright (c) 1994 Wilko Bulte 3.\" All rights reserved. 4.\" 5.\" Redistribution and use in source and binary forms, with or without 6.\" modification, are permitted provided that the following conditions 7.\" are met: 8.\" 1. Redistributions of source code must retain the above copyright 9.\" notice, this list of conditions and the following disclaimer. 10.\" 2. Redistributions in binary form must reproduce the above copyright 11.\" notice, this list of conditions and the following disclaimer in the 12.\" documentation and/or other materials provided with the distribution. 13.\" 3. The name of the author may not be used to endorse or promote products 14.\" derived from this software without specific prior written permission 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26.\" 27.\" $FreeBSD$ 28.\" 29.Dd August 31, 1994 30.Dt FDC 4 31.Os 32.Sh NAME 33.Nm fdc 34.Nd PC architecture floppy disk controller driver 35.Sh SYNOPSIS 36.Cd device fdc 37.Cd device fd 38.Pp 39In 40.Pa /boot/device.hints : 41.Cd hint.fdc.0.at="isa" 42.Cd hint.fdc.0.port="0x3F0" 43.Cd hint.fdc.0.irq="6" 44.Cd hint.fdc.0.drq="2" 45.Cd hint.fd.0.at="fdc0" 46.Cd hint.fd.0.drive="0" 47.Cd hint.fd.1.at="fdc0" 48.Cd hint.fd.1.drive="1" 49.Sh DESCRIPTION 50This driver provides access to floppy disk drives. 51In /dev for each floppy device a number of minor devices are present. 52The 53/dev/fd* devices with trailing alphabetic characters are used to indicate 54.Sq partitions 55on the floppy disk. 56The /dev/fd*.<number> are devices that 57indicate the size of the floppy disk (so: 720kB, 1440kB etc). The latter 58are used for formatting disks using fdformat or for accessing different 59density disks in multidensity drive. 60Example: 720kB disk in a 1.44Mb drive. 61.Pp 62Normally, the driver will ask the system's CMOS memory to obtain the 63floppy drive configuration. Some machines do not store any form of a 64configuration value in their CMOS. Use the flags value 65.Ql 0x1 66to pretend a 1.44 MB floppy drive as the first unit, without asking the 67CMOS for it. 68.Pp 69Normally, the device driver detects FDC chipsets that have an internal 70FIFO, and enables the FIFO on them. There is a slight chance that this 71feature is actually misdetected (seen on an IBM Thinkpad 755c), so it 72can be turned off using flags 73.Ql 0x4 . 74.Sh FILES 75.Bl -tag -width Pa -compact 76.It Pa /dev/fd* 77floppy disk device nodes 78.It Pa /dev/fd*. Ns Ar "<size in kB>" 79floppy disk device nodes where the trailing number indicates the floppy 80capacity 81.It Pa /sys/i386/conf/GENERIC 82sample generic kernel config file 83.It Pa /sys/isa/fd.c 84floppy driver source 85.El 86.Sh SEE ALSO 87.Xr fdformat 1 , 88.Xr disktab 5 89