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freebsd/share/man/man4/puc.4

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.\" Copyright (c) 2002 John Hay.
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
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.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" $FreeBSD$
.\"
.Dd February 7, 2002
.Dt PUC 4
.Os
.Sh NAME
.Nm puc
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.Nd PCI
.Dq Universal
Communications driver
.Sh SYNOPSIS
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.Cd "device pci"
.Cd "device puc"
.Cd "device sio"
.Cd "device ppc"
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.Cd "options PUC_FASTINTR"
.Sh DESCRIPTION
This driver acts as a shim to connect PCI serial and parallel ports to the
.Xr sio 4
and
.Xr ppc 4
driver.
.Pp
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The list of supported devices is in
.Pa sys/dev/puc/pucdata.c .
Support for new cards should be added there.
.Pp
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If the
.Dv PUC_FASTINTR
option is used, the driver will try to use fast interrupts.
This should lower the interrupt latency and should be used if the
.Xr sio 4
driver reports
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.Sy "silo overflow"
errors.
It cannot be used if the interrupt is shared.
.Sh SEE ALSO
.Xr ppc 4 ,
.Xr sio 4
.Sh HISTORY
This driver took the idea from the
.Nx
.Xr puc 4
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driver and still uses the same structure to describe cards, to ease exchanging
card info.
.Sh BUGS
Only serial ports are supported through the
.Xr sio 4
driver at the moment.