ESP(4)                OpenBSD Programmer's Manual (SPARC)               ESP(4)

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

SYNOPSIS
     dma0 at obio0 addr 0xfa001000 level 4              (sun4/300)
     esp0 at obio0 addr 0xfa000000 level 4 flags 0x00ff000f

     dma0 at sbus0                                      (on-board)
     esp0 at sbus0 flags 0x00ff000f                     (sun4c)
     esp0 at dma0 flags 0x00ff000f                      (sun4m)

     dma* at sbus?                                      (SBus SCSI)
     esp* at sbus? flags 0x00ff000f                     (two flavours)
     esp* at dma? flags 0x00ff000f                      (depending on model)

DESCRIPTION
     The esp is an on-board or SBus SCSI controller based on the NCR 53c94
     chip, found on Sun 4/300, sun4c and sun4m 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 discon-
     nect/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), si(4), st(4), sw(4),
     uk(4)

OpenBSD 4.7                      May 31, 2007                                1
