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