Copyright (c) 1994 Wilko Bulte
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$FreeBSD: releng/11.0/share/man/man4/ahb.4 208027 2010-05-13 12:07:55Z uqs $
.Dd July 4, 2004 .Dt AHB 4 .Os .Sh NAME .Nm ahb .Nd Adaptec EISA SCSI host adapter driver .Sh SYNOPSIS To compile this driver into the kernel, place the following lines in your kernel configuration file: d -ragged -offset indent .Cd "device scbus" .Cd "device ahb" .Ed
p Alternatively, to load the driver as a module at boot time, place the following line in .Xr loader.conf 5 : d -literal -offset indent ahb_load="YES" .Ed .Sh DESCRIPTION This driver provides access to the .Tn SCSI bus connected to an Adaptec AHA-174X host adapters in .Dq Em enhanced mode. Tagged queueing and synchronous SCSI transfers are supported. .Sh HARDWARE The .Nm driver supports the following SCSI host adapters:
p l -bullet -compact t Adaptec AHA-1740 t Adaptec AHA-1742 t Adaptec AHA-1740A t Adaptec AHA-1742A .El .Sh SEE ALSO .Xr aha 4 , .Xr ahc 4 , .Xr aic 4 , .Xr cd 4 , .Xr da 4 , .Xr sa 4 , .Xr scsi 4 .Sh AUTHORS The .Nm driver was written by .An Justin T. Gibbs . .Sh CAVEATS The Adaptec 174X is very sensitive to SCSI bus termination and cable length. It may also have difficulties operating with some modern devices that, due to their speed, expose timing problems in the controller. There are no known mechanisms for working around device incompatibilities of this nature.