freebsd-dev/share/man/man4/aha.4

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.\"
.\" Copyright (c) 1994 Wilko Bulte
.\" All rights reserved.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" $FreeBSD$
.\"
.Dd October 15, 1998
.Dt AHA 4
.Os
.Sh NAME
.Nm aha
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.Nd Adaptec SCSI host adapter driver
.Sh SYNOPSIS
.Cd device aha
.Cd device scbus
.Pp
In
.Pa /boot/device.hints :
.Cd hint.aha.0.at="isa"
.Sh DESCRIPTION
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This driver provides access to the
.Tn SCSI
bus connected to an Adaptec AHA-154xB, AHA-154xC,
AHA-154xCF, AHA-154xCP, or AHA-1640 host adapter.
x is 0 for controllers without a floppy drive and 2 for controllers
that have them.
Host adapters supporting a 154x compatible interface,
such as some Tekram controllers and the Adaptec AHA-174x in 154x
emulation mode can also be attached with this driver.
For optimum
performance, Adaptec AHA-174x controllers should be configured in
enhanced mode and attached via the
.Xr ahb 4
driver.
.Pp
One device hint entry for every card to be attached by the system is
required.
Specific values for the port address, irq, and drq may be specified.
If wildcard values are used, the driver will query the device for its
current settings and use those.
If the port address
is a wildcard, the driver consults an internal table of possible port address
locations and attaches to the first unattached card it finds.
The possible
port addresses for this card are 0x330, 0x334, 0x230, 0x234, 0x130, and
0x134.
.Pp
The AHA-1640 is a MCA bus card.
Since the MCA bus is a self-identifying bus, no setting of hints is
required.
.Sh BUGS
The AHA-154xA card does not support residuals on data transfers.
As a result, this card is no longer supported.
.Pp
There have been some reports that the AHA-154xB does not work well
under heavy load.
.Pp
The AHA-154xCP is a plug and play controller.
However, its resources are set using the on-board BIOS and cannot be
moved.
Failures to attached for this card are often caused when the resources
set in the BIOS conflict
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.Sh SEE ALSO
.Xr ahb 4 ,
.Xr ahc 4 ,
.Xr aic 4 ,
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.Xr cd 4 ,
.Xr da 4 ,
.Xr sa 4 ,
.Xr scsi 4
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.\"
.\" .Sh DIAGNOSTICS
.\"
.Sh AUTHORS
.An -nosplit
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The
.Nm
driver was ported by
.An M. Warner Losh
from the
.Nm bt
driver written by
.An Justin T. Gibbs .