FD(4)                NetBSD/sparc Kernel Interfaces Manual               FD(4)

NAME
     fd, fdc -- Sun SPARCstation i82072 or i82077 floppy disk controller
     driver

SYNOPSIS
     fdc0 at mainbus0 (sun4c)
     fdc0 at obio0 (sun4m)
     fd* at fdc0

DESCRIPTION
     This is the driver for the built-in floppy disk drive run by the Intel
     i82072 or i82077 controller chip found on the SPARCstation desktop sys-
     tems, and other SPARC systems.

     Bits [0-3] of the minor device number of the special files referring to
     this device encode the floppy density as follows:

           0       3.5'' 1.44MB floppy diskettes.

           1       3.5'' 720KB floppy diskettes.

           2       3.5'' 360KB floppy diskettes.

           3       3.5'' 1.2MB/NEC Japanese format floppy diskettes.

FORMATTING
     The driver supports floppy disk formatting using the interfaces in
     <sys/fdio.h>:

     FDIOCGETFORMAT struct fdformat_parms
                        Fetch current formatting parameters.  This gets the
                        default parameters for the open device if no parame-
                        ters have been set during the session.

     FDIOCSETFORMAT struct fdformat_parms
                        Set formatting parameters.  The driver saves this
                        state and it persists while the device is open.

     FDIOCFORMAT_TRACK struct fdformat_cmd
                        Format a track on the medium.  If this call returns
                        EINVAL, the track formatting parameters were out of
                        range for the medium.  If it returns EIO, there was a
                        medium error while formatting the track.

     FDIOCSETOPTS int   Set driver options which persist until the device is
                        closed.  The options should be the logical OR of the
                        desired values below:

                        FDOPT_NORETRY  Do not retry operations on failure
                        FDOPT_SILENT   Do not print error messages to the con-
                                       sole

     FDIOCGETOPTS int   Fetch drive options.

     A typical use of the formatting facilities would be to open the device,
     call FDIOCGETFORMAT to fetch the current format parameters, perhaps
     change a parameter or two, display the formatting details to the user,
     and then call FDIOCSETFORMAT followed by a series of calls to
     FDIOCFORMAT_TRACK.

SEE ALSO
     eject(1), fdformat(1)

HISTORY
     The fd formatting support appeared in NetBSD 1.3.

NetBSD 5.0_STABLE                May 12, 2007                NetBSD 5.0_STABLE
