ahb.4 revision 13502

Copyright (c) 1994 Wilko Bulte
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.Dd January 19, 1996 .Dt AHB 4 i386 .Os FreeBSD .Sh NAME .Nm ahb .Nd Adaptec EISA SCSI host adapter driver .Sh SYNOPSIS .Cd controller ahb0 at isa? bio irq ? vector ahbintr .Cd controller scbus0 at ahb0 .Sh DESCRIPTION This driver provides access to the .Tn SCSI bus connected to an Adaptec 174x hostadapter in either .Dq Em standard or .Dq Em enhanced mode. If the controller is set to standard mode (using the .Tn EISA configuration utility), the driver will automatically switch the card to enhanced mode during the device probe.

p .Sy N.B. : When configuring a system with both .Xr aha 4 and .Nm drivers, the .Nm driver should be listed first in the kernel configuration file. This ensures that the .Nm driver will find the Adaptec 174x boards before the .Xr aha 4 driver probes for Adaptec 154x boards.

p Note that no I/O addresses are configured in the kernel config file. The 174x uses .Tn EISA slot-specific I/O which is configured automatically.
.Sh DIAGNOSTICS

.Sh SEE ALSO .Xr aha 4 , .Xr ahc 4 , .Xr cd 4 , .Xr scsi 4 , .Xr sd 4 , .Xr st 4 .Sh AUTHOR The .Nm driver was written by Julian Elischer for .Tn Mach 2.5. It was converted to automatic .Tn EISA configuration by Justin Gibbs. .Sh HISTORY The .Nm driver first appeared in the .Tn 386BSD patchkit.