SCSI Adapter Support

SCSI Adapter Support

The detailed, board-level programming of the host SCSI adapters is done by an IRIX-supplied host adapter driver. The services of this driver are available to the SCSI device drivers that manage the logical devices. If you write a SCSI driver, it will control the device indirectly, by calling a host adapter driver.

The host adapter drivers handle the low-level communication over the SCSI interface, such as programming the SCSI interface chip or board, negotiating synchronous or wide mode, and handling disconnect/reconnect. SCSI device drivers call on host adapter drivers using indirect calls through a table of adapter functions. The use of host adapter drivers is documented in the IRIX Device Driver Programmer's Guide.