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125 lines
4.1 KiB
Groff
125 lines
4.1 KiB
Groff
.\"
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.\" Copyright (c) 1996 John Hay. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by John Hay.
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.\" 4. Neither the name of the author nor the names of any co-contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY John Hay ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL John Hay BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $Id$
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.\"
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.Dd July 4, 1996
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.Dt SR 4 i386
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.Os
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.Sh NAME
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.Nm sr
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.Nd synchronous RISCom/N2 device driver.
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.Sh SYNOPSYS
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.Cd "device sr0 at isa? port 0x300 net irq 10 iomem 0xd0000 vector arintr"
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.Cd "device sr1 at isa? port 0x310 net irq 11 flags 0x1 iomem 0xd0000 vector arintr"
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.Pp
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.Cd "pseudo-device sppp"
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.Sh DESCRIPTION
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The
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.Nm sr
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driver supports the RISCom/N2 ISA cards that is based on the
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HD64570 chip.
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.Pp
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Line speeds of up to 2Mbps is possible. At this speed about 95% of the
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bandwidth is usable with 486DX processors.
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.Pp
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The standard FreeBSD sppp code is used for the link level layer. The
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default protocol used is PPP. The Cisco HDLC protocol can be used by
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adding
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.Em link2
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to
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.Xr ifconfig 8 .
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.Pp
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The
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.Em flags
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field is optional. If it isn't specified, the driver will
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assume the following:
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.Pp
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.Bl -hang -offset indent
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.It "The card has 2 ports."
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.It "The clock for the serial ports is external and the transmitter uses"
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the same clock as the receiver.
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.El
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.Pp
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The
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.Em flags
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are a bit field and can be used to force a different
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behaviour than the default.
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.Pp
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.Bl -hang -offset indent
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.It Em 0x01
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The card has only one port.
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.It Em 0x10
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Use sepperate external clocks for transmit and receive on port 0.
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.It Em 0x40
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Use sepperate external clocks for transmit and receive on port 1.
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.El
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.Pp
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.Sh NUMBERING
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Only one line for each card is needed in the kernel configuration file.
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The first card's ports will be installed from sr0. The numbering of the
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next card will continue where the first stopped, eg. if the first card
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is a two port card it will use sr0 and sr1. The next card will then
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start at sr2.
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.Pp
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The card only supports IRQ 3, 4, 5, 7, 10, 11, 12 and 15.
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.Pp
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The iomem area is a 16Kb block and must start at a 16Kb boundary.
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.Pp
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.Sh DIAGNOSTICS
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.Bl -diag
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.It "sr%d: Warning illegal interrupt %d."
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The card cannot use the specified interrupt. Choose a different one.
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.El
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.Sh FILES
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.Bl -tag -width /sys/i386/isa/ic/hd64570.h -compact
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.It Pa /sys/i386/isa/ic/hd64570.h
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.It Pa /sys/i386/isa/if_srregs.h
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.It Pa /sys/i386/isa/if_sr.c
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.El
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.Sh BUGS
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At the moment only the X.21 interface is tested. The others
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may need tweaks to the clock selection code.
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.Pp
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The code can probably stand some optimizing.
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.Pp
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There must be lots because this code is still very green. Please report
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them to jhay@mikom.csir.co.za
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.Sh SEE ALSO
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.Xr ar 4 ,
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.Xr cx 4 ,
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.Xr netintro 4 ,
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.Xr ifconfig 8 ,
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.Xr lsdev 8
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.Sh AUTHOR
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The
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.Nm sr
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device driver was written by John Hay, jhay@mikom.csir.co.za.
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