NAME

       aha — Adaptec SCSI host adapter driver

SYNOPSIS

       To compile this driver into the kernel, place the following lines in your kernel configuration file:

             device scbus
             device aha

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

             aha_load="YES"

       In /boot/device.hints:
       hint.aha.0.at="isa"

DESCRIPTION

       This  driver  provides  access  to  the SCSI bus connected to the Adaptec AHA-154x and AHA-1640 SCSI host
       adapters.  x is 0 for controllers without a floppy drive and 2  for  controllers  that  have  them.   For
       optimum  performance, Adaptec AHA-174x controllers should be configured in enhanced mode and attached via
       the ahb(4) driver.

       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.

       The  AHA-1640  is  an  MCA bus card.  Since the MCA bus is a self-identifying bus, no setting of hints is
       required.

HARDWARE

       The aha driver supports the following SCSI host adapters:

       •   Adaptec AHA-154xB
       •   Adaptec AHA-154xC
       •   Adaptec AHA-154xCF
       •   Adaptec AHA-154xCP
       •   Adaptec AHA-1640
       •   Adaptec AHA-174x in 154x emulation mode
       •   DTC 3290 SCSI controller in 1542 emulation mode
       •   Tekram SCSI controllers in 154x emulation mode

SEE ALSO

       ahb(4), ahc(4), aic(4), cd(4), da(4), sa(4), scsi(4)

AUTHORS

       The aha driver was ported by M. Warner Losh from the bt driver written by Justin T. Gibbs.

BUGS

       The AHA-154xA card does not support residuals on data transfers.  As a result, this  card  is  no  longer
       supported.

       There have been some reports that the AHA-154xB does not work well under heavy load.

       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.

Debian                                            July 4, 2004                                            AHA(4)