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ESP(4) Device Drivers Manual (sparc) ESP(4)

espESP NCR 53c94 on-board or SBus SCSI interface

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 and sun4e)
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)

The esp is an on-board or SBus SCSI controller based on the NCR 53c94 chip, found on Sun 4/300, sun4c, sun4e and sun4m workstations.

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.

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

July 10, 2010 OpenBSD-5.9