ESP(4) | Device Drivers Manual (sparc64) | ESP(4)

# 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.

March 30, 2015 | Debian