NAME

aic - low-level module for Adaptec AIC-6360 based ISA host bus adapters

SYNOPSIS

aic@ioaddr,0

AVAILABILITY

x86

DESCRIPTION

The aic module provides low-level interface routines between the common disk/tape I/O subsystem and AIC-6360 based SCSI (Small Computer System Interface) bus controllers. It also provides support for the Adaptec AHA-1510A, AHA-1520A, and AHA-1522A SCSI controllers. It supports the AIC-6360 SCSI controller on the Sound Blaster 16 SCSI-2 board but does not support the audio functions -- the sbpro(7D) driver provides these capabilities. Note that the AHA-1510A board and the SCSI port on the Sound Blaster 16 SCSI-2 board can only be used as a secondary controller -- not a primary (boot) controller.

The aic module can be configured for disk and streaming tape support for one or two host adapter boards, each of which must be the sole initiator on a SCSI bus. Autoconfiguration code determines if the adapter is present at the configured address and determines what types of devices are attached to the adapter.

CONFIGURATION

The driver attempts to initialize itself using the information found in the configuration file, aic.conf.

If multiple boards are configured in a single system, each board must occupy a different I/O base address in the system I/O address space. Each board must also be assigned a different IRQ level.

The AHA-1522 or AHA-1520A controller can be used as a primary boot controller only at I/O base address 0x340 (unless special BIOS from Adaptec is procured). Therefore, if a system installation is performed using a SCSI device (such as a CD-ROM drive) connected to one of these adapters, the adapter must be configured with I/O base address 0x340 . (The adapter BIOS supports booting from this address only.)

Refer to the AHA-1520A/1522A AT-to-SCSI Host Adapters Installation Guide provided with the controller for instructions on installation of the adapter and the valid jumper settings. The default jumper configuration described in the AHA-1520A/1522A AT-to-SCSI Host Adapters Installation Guide is the recommended configuration for the controller.

FILES

/kernel/drv/aic.conf

aic device driver configuration file

SEE ALSO

driver.conf(4), sysbus(4), sbpro(7D)

NOTES

The aic driver does not support direct memory access (DMA).

The aic driver does not support SCSI timeouts.