aha(4)

NAME

aha - Adaptec SCSI host adapter driver

SYNOPSIS

device aha
device scbus
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 con

trollers 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:

+o Adaptec AHA-154xB
+o Adaptec AHA-154xC
+o Adaptec AHA-154xCF
+o Adaptec AHA-154xCP
+o Adaptec AHA-1640
+o Adaptec AHA-174x in 154x emulation mode
+o DTC 3290 SCSI controller in 1542 emulation mode
+o 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 trans

fers. 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.

BSD July 4, 2004

BSD