1.\" $NetBSD: fdc.4,v 1.4 2002/02/07 03:15:09 ross Exp $ 2.\" 3.\" Copyright (c) 1998 The NetBSD Foundation, Inc. 4.\" All rights reserved. 5.\" 6.\" This code is derived from software contributed to The NetBSD Foundation 7.\" by Klaus J. Klein. 8.\" 9.\" Redistribution and use in source and binary forms, with or without 10.\" modification, are permitted provided that the following conditions 11.\" are met: 12.\" 1. Redistributions of source code must retain the above copyright 13.\" notice, this list of conditions and the following disclaimer. 14.\" 2. Redistributions in binary form must reproduce the above copyright 15.\" notice, this list of conditions and the following disclaimer in the 16.\" documentation and/or other materials provided with the distribution. 17.\" 3. All advertising materials mentioning features or use of this software 18.\" must display the following acknowledgement: 19.\" This product includes software developed by the NetBSD 20.\" Foundation, Inc. and its contributors. 21.\" 4. Neither the name of The NetBSD Foundation nor the names of its 22.\" contributors may be used to endorse or promote products derived 23.\" from this software without specific prior written permission. 24.\" 25.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 26.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 29.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35.\" POSSIBILITY OF SUCH DAMAGE. 36.\" 37.Dd February 28, 1998 38.Dt FDC 4 amiga 39.Os 40.Sh NAME 41.Nm fdc 42.Nd Amiga custom chip floppy disk controller device 43.Sh SYNOPSIS 44.Cd "fdc0 at mainbus0" 45.Cd "fd* at fdc? unit ?" 46.Sh DESCRIPTION 47The 48.Nm 49device driver provides support for the mainboard floppy disk controller and 50floppy disk drives on Amiga systems. 51.Pp 52The driver supports the following floppy diskette formats by using 53particular partitions: 54.Bl -tag -width Dv -offset indent -compact 55.It "880KB " "3.5-inch " 11 sectors/track (``Amiga'') (a) 56.It "1.76MB" "3.5-inch " 22 sectors/track (``Amiga'') (a) 57.It "880KB " "5.25-inch" 11 sectors/track (``Amiga'') (a) 58.It "720KB " "3.5-inch " 9 sectors/track (``MS-DOS'') (b) 59.It "1.44MB" "3.5-inch " 18 sectors/track (``MS-DOS'') (b) 60.It "720KB " "5.25-inch" 9 sectors/track (``MS-DOS'') (b) 61.El 62On systems equipped with floppy disk drives capable of using high-density 63floppy diskettes, 64the driver automatically detects whether the inserted floppy diskette is 65either a double-density or a high-density medium. 66.Sh DIAGNOSTICS 67.Bl -diag 68.It "fdc: unable to allocate dma buffer" 69The driver found the controller, but was unable to allocate the 70amount of chip memory required for its DMA buffers. 71.El 72.Sh SEE ALSO 73.Xr fdformat 1 , 74.Xr autoconf 4 75.Sh BUGS 76In order to detect a floppy disk drive's capability of using high-density 77media, a high-density diskette has to be inserted for the duration of the 78autoconfiguration phase of the drive. 79.Pp 80The 81.Nm 82driver supports neither the 83.Xr fdformat 1 84facility nor the 85.Pa Aq sys/fdio.h 86interface. 87