Man page update from wilko@idca.tds.philips.nl
This commit is contained in:
Andrey A. Chernov
parent
99f5fd8ca9
commit
211439cc2a
@ -34,7 +34,7 @@
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.\"
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.\" from: @(#)dca.4 5.2 (Berkeley) 3/27/91
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.\" from: com.4,v 1.1 1993/08/06 11:19:07 cgd Exp
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.\" $Id: sio.4,v 1.1 1993/08/28 12:41:23 rgrimes Exp $
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.\" $Id: sio.4,v 1.2 1994/02/09 23:49:45 ache Exp $
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.\"
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.Dd February 9, 1994
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.Dt SIO 4 i386
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@ -84,10 +84,20 @@ For multiport cards the
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.Nm flags
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keyword in the kernel configuration file determines which port of
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your multiport card is the master device, and whether the
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port is part of a multiport card. The master device is the port with
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the shared interrupt register.
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All ports of a multiport card report
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pending interrupts using this single register.
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port is part of a multiport card. The master device is the port which
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has register through which all interrupts of the card are funneled.
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All ports of a multiport card report pending interrupts using this
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single register.
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.sp
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The master device is indicated
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.Nm bitwise
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, so all sio entries in the kernel config file that are part of a
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multiport card must include the correct
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.Nm flags
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specification. The bitwise assignment allows multiple multiport cards to
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be configured in one system. It does
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.Nm not
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imply that the hardware can share the same physical interrupt line!
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.Pp
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In the synopsis the
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.Nm flags 0x401
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@ -104,10 +114,6 @@ will be
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.Pp
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Which port is the master device depends on the card type. Consult
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the hardware documentation of your card.
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If you are shure, that your master device fully compatible with
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standard port, you can ommit
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.Nm flags
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field from master device description line.
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.Pp
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Serial ports controlled by the
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.Nm sio
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@ -147,18 +153,25 @@ driver is derived from the
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driver and is
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.Ud
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.Sh BUGS
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Data loss is not near as likely on busy systems
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but they still can occur at very high baud rates on slow systems. The
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Data loss is not near as likely on busy systems as they are with the
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.Xr com 4
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driver but they still can occur at very high baud rates on slow systems. The
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use of NS16550A's helps lot to handle high baud rates.
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.Pp
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Stay away from NS16550 (so without the trailing A). These are early
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implementations of the chip with non-functional FIFO hardware.
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.Pp
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The constants which define the locations
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of the various serial ports are holdovers from
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.Nm DOS .
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As shown, hex addresses can be used instead.
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As shown, hex addresses can be and for clarity probably should be used instead.
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.Pp
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As usual, you get what you pay for; cheap NS16550 clones generally don't work.
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.Pp
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The multiport example has been successfully tested with an AST/4 card, your
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mileage may vary however.
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.Pp
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This man page can not replace the Ultimate Doc(tm): the source.
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The multiport example is based on an AST/4 card, your
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mileage may vary however. Note that on the AST/4 the card's dipswitches should
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.Nm not
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be set to use interrupt sharing. AST/4-like interrupt sharing is only used when
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.Nm multiple
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AST/4 cards are installed in the same system. The sio driver does not
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support more than 1 AST/4 on one IRQ.
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@ -34,7 +34,7 @@
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.\"
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.\" from: @(#)dca.4 5.2 (Berkeley) 3/27/91
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.\" from: com.4,v 1.1 1993/08/06 11:19:07 cgd Exp
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.\" $Id: sio.4,v 1.1 1993/08/28 12:41:23 rgrimes Exp $
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.\" $Id: sio.4,v 1.2 1994/02/09 23:49:45 ache Exp $
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.\"
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.Dd February 9, 1994
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.Dt SIO 4 i386
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@ -84,10 +84,20 @@ For multiport cards the
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.Nm flags
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keyword in the kernel configuration file determines which port of
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your multiport card is the master device, and whether the
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port is part of a multiport card. The master device is the port with
|
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the shared interrupt register.
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All ports of a multiport card report
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pending interrupts using this single register.
|
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port is part of a multiport card. The master device is the port which
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has register through which all interrupts of the card are funneled.
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All ports of a multiport card report pending interrupts using this
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single register.
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.sp
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The master device is indicated
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.Nm bitwise
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, so all sio entries in the kernel config file that are part of a
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multiport card must include the correct
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.Nm flags
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specification. The bitwise assignment allows multiple multiport cards to
|
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be configured in one system. It does
|
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.Nm not
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imply that the hardware can share the same physical interrupt line!
|
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.Pp
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In the synopsis the
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.Nm flags 0x401
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@ -104,10 +114,6 @@ will be
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.Pp
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Which port is the master device depends on the card type. Consult
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the hardware documentation of your card.
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If you are shure, that your master device fully compatible with
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standard port, you can ommit
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.Nm flags
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field from master device description line.
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.Pp
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Serial ports controlled by the
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.Nm sio
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@ -147,18 +153,25 @@ driver is derived from the
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driver and is
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.Ud
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.Sh BUGS
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Data loss is not near as likely on busy systems
|
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but they still can occur at very high baud rates on slow systems. The
|
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Data loss is not near as likely on busy systems as they are with the
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.Xr com 4
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driver but they still can occur at very high baud rates on slow systems. The
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use of NS16550A's helps lot to handle high baud rates.
|
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.Pp
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Stay away from NS16550 (so without the trailing A). These are early
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implementations of the chip with non-functional FIFO hardware.
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.Pp
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The constants which define the locations
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of the various serial ports are holdovers from
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.Nm DOS .
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As shown, hex addresses can be used instead.
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As shown, hex addresses can be and for clarity probably should be used instead.
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.Pp
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As usual, you get what you pay for; cheap NS16550 clones generally don't work.
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.Pp
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The multiport example has been successfully tested with an AST/4 card, your
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mileage may vary however.
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.Pp
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This man page can not replace the Ultimate Doc(tm): the source.
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The multiport example is based on an AST/4 card, your
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mileage may vary however. Note that on the AST/4 the card's dipswitches should
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.Nm not
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be set to use interrupt sharing. AST/4-like interrupt sharing is only used when
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.Nm multiple
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AST/4 cards are installed in the same system. The sio driver does not
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support more than 1 AST/4 on one IRQ.
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