ESP(4) - Device Drivers Manual (sparc64)

ESP(4) - Device Drivers Manual (sparc64) #

ESP(4) - Device Drivers Manual (sparc64)

NAME #

esp - ESP NCR 53c94 on-board or SBus SCSI interface

SYNOPSIS #

**dma* at sbus? ** (SBus SCSI) **esp* at dma? ** (two flavours) **esp* at sbus? ** (depending on model)

DESCRIPTION #

The esp is an on-board or SBus SCSI controller based on the NCR 53c94 chip, found on some Sun UltraSPARC workstations.

DEVICE FLAGS #

Bits 0-15

Disable disconnect/reselect for the corresponding target

Bits 16-31

Disable synchronous negotiation for target “[bit - 16]”

The esp device flags may be OR’d together to enable any combination of the features listed above. Targets 4 through 7 typically have disconnect/reselect enabled on the premise that tape devices normally have one of these targets. Tape devices should be allowed to disconnect for the SCSI bus to operate acceptably.

SEE ALSO #

cd(4), ch(4), intro(4), sbus(4), scsi(4), sd(4), st(4), uk(4)

HISTORY #

OpenBSD support for the esp first appeared in OpenBSD 3.0.

OpenBSD 7.5 - March 30, 2015