Technical data

SunOS 5.5 Devices eha(7D)
NAME eha − low-level module for Adaptec 174x EISA host bus adapter
AVAILABILITY x86
DESCRIPTION The eha module provides low-level interface routines between the common disk/tape io
subsystem and the Adaptec EISA 174x SCSI (Small Computer System Interface) controll-
ers. The eha module can be configured for disk and streaming tape support for one or
more host adapter boards, each of which must be the sole initiator on a SCSI bus. Auto
configuration code determines if the adapter is present at the configured address and
what types of devices are attached to it.
Board Configuration
and Auto
Configuration
The driver attempts to initialize itself in accordance with the information found in the
configuration file, /kernel/drv/eha.conf. The only relevant user configurable item in this
file is:
io address "reg=0x1000,0,0"
"ioaddr=0x1000"
The I/O address is 0x1000 times the EISA slot number. Hence, slot 1 is address 0x1000
and slot 8 is 0x8000.
Prior to installation, the 174x controller must be put into enhanced mode with the EISA
configuration utility run under MS-DOS.
The default listingof the configuration file is as follows:
#
# primary controller [Settings for CD-ROM installation]
#
name="eha" class="sysbus" reg=0x1000,0,0
ioaddr=0x1000;
# another controller example
#
name="eha" class="sysbus" reg=0x2000,0,0
ioaddr=0x2000;
#
To speed boot, parameters in the configuration file may be commented out with a "#" in
the first column for controllers that are not installed.
modified 18 Oct 1993 7D-93