AHB(4FREEBSD) - man page online | special files

AHB(4)                             BSD Kernel Interfaces Manual                            AHB(4)

NAME
     ahb — Adaptec EISA SCSI host adapter driver

SYNOPSIS
     To compile this driver into the kernel, place the following lines in your kernel configura‐
     tion file:

           device scbus
           device ahb

     Alternatively, to load the driver as a module at boot time, place the following line in
     loader.conf(5):

           ahb_load="YES"

DESCRIPTION
     This driver provides access to the SCSI bus connected to an Adaptec AHA-174X host adapters
     in “enhanced” mode.  Tagged queueing and synchronous SCSI transfers are supported.

HARDWARE
     The ahb driver supports the following SCSI host adapters:

     ·   Adaptec AHA-1740
     ·   Adaptec AHA-1742
     ·   Adaptec AHA-1740A
     ·   Adaptec AHA-1742A

SEE ALSO
     aha(4), ahc(4), aic(4), cd(4), da(4), sa(4), scsi(4)

AUTHORS
     The ahb driver was written by Justin T. Gibbs.

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 incom‐
     patibilities of this nature.

BSD                                        July 4, 2004                                       BSD