mcis(7D)

NAME

mcis − low-level module for IBM MicroChannel host bus adapter

AVAILABILITY

x86

DESCRIPTION

The mcis module provides low-level interface routines between the common disk/tape I/O subsystem and the IBM MicroChannel bus master SCSI (Small Computer System Interface) controllers. The mcis 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 confi- guration 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/mcis.conf. The relevant user configurable items in this file are:

io port ’reg=0x3540,0,0’ ’ioaddr=0x3540’,
hardware cache ’hwcache="on"’.

The first host bus adapter is at address 0x3540. If there is a second or third adapter (up to four are permitted on a PS/2 Model 95), uncomment the appropriate line(s) in the configuration file.

The hwcache property controls the cache on the host bus adapter. Enabling the cache can increase file system performance.

Note that the IBM boot disk must be configured at target 6 lun 0.

FILES

/kernel/drv/mcis.conf configuration file for mcis.