SA(4) BSD Programmer's Manual SA(4)NAMEsa - Adaptec AHA-1520/AHA-1522 SCSI host adapter driver
SYNOPSIS
sa0 at isa? port 0x340 flags 0x000000
DESCRIPTION
The sa driver is a software interface to the Adaptec AHA-1520 and
AHA-15422 ISA host adapters for the Small Computer Systems Interface
(X3.131-1992) bus. These cards are built around the Adaptec AIC-6260
single chip SCSI processor. Other compatible implementations using this
processor such as the NEC motherboard and the SoundBlaster 16 are sup-
ported by this software. It should be noted that not all implementations
(such as the SoundBlaster 16) have the BIOS PROMs required in order to
boot. The AHA-1522 differs from the AHA-1520 in providing an on-board
floppy controller that is handled using a standard floppy interface (see
fd(4)).
The sa driver is designed to be used as a machine-dependent back end for
machine-independent SCSI pseudo-devices (see sd(4), sg(4), st(4)).
Booting from a SCSI disk attached to an Adaptec AHA-1520 host adapter is
done using the generic BIOS boot code.
CONFIGURATION
There are two possible base port addresses: 0x340 is the standard, and
0x140 is the alternate address. Care should be taken to avoid overlaps
with other devices as 32 consecutive ports are taken up by this device.
BOOT PARAMETERS
There are now parameters which are configurable from boot(8) with the
-parm command. Typically these commands would be added to boot.default(5)
though they can be set at the ``boot:'' prompt.
Many of the parameters take as an argument one or more target ids. The
following are permissible arguments to these parameters:
t0 target 0.
target0 target 0.
t1 target 1.
target1 target 1.
t2 target 2.
target2 target 2.
.
.
.
t6 target 6
target6 target 6
t7 target 7
target7 target 7
all targets 0 through 7
none no targets
The following parameters take a list of target specifiers as an argu-
ment(s):
disconnect
These targets are allowed to disconnect. Examples:
-parm sa* disconnect=all #default
-parm sa0 disconnect=all-t1 #all but target 1
parity Check parity from these targets. Examples:
-parm sa* parity=all #default
-parm sa0 parity=all-target2 #all but target 2
single_lun
For these targets only look at lun 0.
-parm sa* single_lun=none #default
-parm sa* single_lun=all
skip_targets
These targets will not be probed at boot. Examples:
-parm sa* skip_targets=none #default
-parm sa0 skip_targets=target5 #Don't probe target 5
The following parameters take a numeric value as an argument:
initiator_id
Set the initiator id of the adapter to this.
-parm sa* initiator_id=7 #default
reset_delay
This is used to control the number of seconds of delay
which is inserted after the SCSI bus is reset at boot time.
-parm sa* reset_delay=5 #default
-parm sa* reset_delay=1 #1 second reset delay
-parm sa* reset_delay=0 #no delay after reset
SEE ALSOsd(4), sg(4), st(4)HISTORY
Originally written for BSD/OS 1.1.
BSDI BSD/OS August 8, 1997 2
