May 12, 2001 OSIOP 4

### NAME

osiop - Symbios/NCR 53C710 SCSI driver

### SYNOPSIS

#### arc

osiop* at jazzio? flags 0x00000

#### ews4800mips

osiop* at sbdio? flags 0x00000

#### hp700

osiop0 at gsc? flags 0x00000

#### mvme68k

osiop0 at pcctwo? ipl 2

scsibus* at osiop?

### DESCRIPTION

The osiop driver provides support for the Symbios/NCR 53C710 SCSI controller chip.

For the Symbios/NCR 53C700 SCSI host adapters, use the oosiop(4) driver.

For the Symbios/NCR 53C8xx PCI SCSI host adapters, use the siop(4) or esiop(4) driver.

### CONFIGURATION

The osiop driver supports the following flags for use in config(1) files:

bits 0-7
  : disable disconnect/reselect for the corresponding SCSI target
bits 8-15
  : disable synchronous negotiation for SCSI target
bits 16
  : disable DMA interrupts

"Target is synonymous with SCSI ID number.

Note that SCSI tape drives should be allowed to perform disconnect/reselect or performance will suffer.

### SEE ALSO

cd(4), ch(4), esiop(4), intro(4), oosiop(4), scsi(4), sd(4), siop(4), ss(4), st(4), uk(4), scsipi(9)

### HISTORY

osiop driver first appeared in NetBSD1.6.

The original NCR 53C710 driver appeared in NetBSD 1.0 amiga port, and Izumi Tsutsui <tsutsui@NetBSD.org> modified the driver and made it machine-independent.