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cy(4)

NAME

     cy -- Cyclades Cyclom-Y serial driver

SYNOPSIS

     For one ISA card:
	   device cy

	   In /boot/device.hints:
	   hint.cy.0.at="isa"
	   hint.cy.0.irq="10"
	   hint.cy.0.maddr="0xd4000"
	   hint.cy.0.msize="0x2000"

     For two ISA cards:
	   device cy

	   In /boot/device.hints:
	   hint.cy.0.at="isa"
	   hint.cy.0.irq="10"
	   hint.cy.0.maddr="0xd4000"
	   hint.cy.0.msize="0x2000"
	   hint.cy.1.at="isa"
	   hint.cy.1.irq="11"
	   hint.cy.1.maddr="0xd6000"
	   hint.cy.1.msize="0x2000"

     For PCI cards:
	   device cy
	   options CY_PCI_FASTINTR

	   No lines are required in /boot/device.hints for PCI cards.

     Minor numbering:
	   0bMMMMMMMMMMMMMMMMxxxxxxxxOLIMMMMM
				     callOut
				      Lock
				       Initial
	     MMMMMMMMMMMMMMMM		MMMMMMinor

DESCRIPTION

     The cy driver provides support for Cirrus Logic CD1400-based EIA RS-232C
     (CCITT V.24) communications interfaces (ports) on Cyclades Cyclom-Y
     boards.  Each CD1400 provides 4 ports.  Cyclom-Y boards with various num-
     bers of CD1400's are available.  This driver supports up to 8 CD1400's
     (32 ports) per board.

     Input and output for each line may set independently to the following
     speeds: 50, 75, 110, 134.5, 150, 300, 600, 1200, 1800, 2400, 4800, 9600,
     19200, 38400, 57600, or 115200 bps.  Other speeds of up to 150000 are
     supported by the termios interface but not by the sgttyb compatibility
     interface.  The CD1400 is not fast enough to handle speeds above 115200
     bps effectively.  It can transmit on a single line at slightly more than
     115200 bps, but when 4 lines are active in both directions its limit is
     about 90000 bps on each line.

     Serial ports controlled by the cy driver can be used for both `callin'
     and `callout'.  For each port there is a callin device and a callout
     are supposed to work on general ports and need to open the port without
     waiting but are too stupid to do so.

     The cy driver also supports an initial-state and a lock-state control
     device for each of the callin and the callout "data" devices.  The minor
     number of the initial-state device is 32 higher than that of the corre-
     sponding data device.  The minor number of the lock-state device is 64
     higher than that of the corresponding data device.  The termios settings
     of a data device are copied from those of the corresponding initial-state
     device on first opens and are not inherited from previous opens.  Use
     stty(1) in the normal way on the initial-state devices to program initial
     termios states suitable for your setup.

     The lock termios state acts as flags to disable changing the termios
     state.  E.g., to lock a flag variable such as CRTSCTS, use stty crtscts
     on the lock-state device.	Speeds and special characters may be locked by
     setting the corresponding value in the lock-state device to any nonzero
     value.

     Correct programs talking to correctly wired external devices work with
     almost arbitrary initial states and almost no locking, but other setups
     may benefit from changing some of the default initial state and locking
     the state.  In particular, the initial states for non (POSIX) standard
     flags should be set to suit the devices attached and may need to be
     locked to prevent buggy programs from changing them.  E.g., CRTSCTS
     should be locked on for devices that support RTS/CTS handshaking at all
     times and off for devices that don't support it at all.  CLOCAL should be
     locked on for devices that don't support carrier.	HUPCL may be locked
     off if you don't want to hang up for some reason.	In general, very bad
     things happen if something is locked to the wrong state, and things
     should not be locked for devices that support more than one setting.  The
     CLOCAL flag on callin ports should be locked off for logins to avoid cer-
     tain security holes, but this needs to be done by getty if the callin
     port is used for anything else.

   Kernel Configuration Options
     The CY_PCI_FASTINTR option should be used to avoid suboptimal interrupt
     handling for PCI Cyclades boards.	The PCI BIOS must be configured with
     the cy interrupt not shared with any other active device for this option
     to work.  This option is not the default because it is currently harmful
     in certain cases where it does not work.

FILES

     /dev/ttyc??   for callin ports
     /dev/ttyic??
     /dev/ttylc??  corresponding callin initial-state and lock-state devices

     /dev/cuac??   for callout ports
     /dev/cuaic??
     /dev/cualc??  corresponding callout initial-state and lock-state devices

     /etc/rc.serial  examples of setting the initial-state and lock-state
		     devices

     The first question mark in these device names is short for the card num-
     ber (a decimal number between 0 and 65535 inclusive).  The second ques-
     tion mark is short for the port number (a letter in the range [0-9a-v]).

     lost.

SEE ALSO

     stty(1), termios(4), tty(4), comcontrol(8), pstat(8)

HISTORY

     The cy driver is derived from the sio driver and the NetBSD cy driver and
     is currently under development.

BUGS

     Serial consoles are not implemented.

FreeBSD 5.4			 May 24, 2004			   FreeBSD 5.4

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