fdc(4) - NetBSD Manual Pages

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FDC(4)               NetBSD/amiga Kernel Interfaces Manual              FDC(4)


NAME

     fdc -- Amiga custom chip floppy disk controller device


SYNOPSIS

     fdc0 at mainbus0
     fd* at fdc? unit ?


DESCRIPTION

     The fdc device driver provides support for the mainboard floppy disk con-
     troller and floppy disk drives on Amiga systems.

     The driver supports the following floppy diskette formats by using par-
     ticular partitions:
           880KB  3.5-inch  11 sectors/track (``Amiga'') (a)
           1.76MB 3.5-inch  22 sectors/track (``Amiga'') (a)
           880KB  5.25-inch 11 sectors/track (``Amiga'') (a)
           720KB  3.5-inch  9 sectors/track (``MS-DOS'') (b)
           1.44MB 3.5-inch  18 sectors/track (``MS-DOS'') (b)
           720KB  5.25-inch 9 sectors/track (``MS-DOS'') (b)
     On systems equipped with floppy disk drives capable of using high-density
     floppy diskettes, the driver automatically detects whether the inserted
     floppy diskette is either a double-density or a high-density medium.


DIAGNOSTICS

     fdc: unable to allocate DMA buffer  The driver found the controller, but
     was unable to allocate the amount of chip memory required for its DMA
     buffers.


SEE ALSO

     fdformat(1), amiga/autoconf(4)


BUGS

     In order to detect a floppy disk drive's capability of using high-density
     media, a high-density diskette has to be inserted for the duration of the
     autoconfiguration phase of the drive.

     The fdc driver supports neither the fdformat(1) facility nor the
     <sys/fdio.h> interface.

NetBSD 9.3                     February 17, 2017                    NetBSD 9.3