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+.\"     $NetBSD: sc.4,v 1.8 2017/07/03 21:30:58 wiz Exp $
+.\"
+.\" written from a reading of config files and driver source code
+.\" Erik E. Fair <fair@NetBSD.org>
+.\" Matt Fredette <fredette@NetBSD.org>
+.Dd June 28, 2001
+.Dt SC 4
+.Os
+.Sh NAME
+.Nm sc
+.Nd Sun Sun-2 SCSI bus host adaptor driver
+.Sh SYNOPSIS
+.Ss sun2
+.Cd "sc0 at mbmem0 addr 0x80000 ipl 2"
+.Cd "sc1 at mbmem0 addr 0x84000 ipl 2"
+.Ss sun2 and sun4
+.Cd "sc0 at vme0 addr 0x200000 irq 2 vec 0x40"
+.Sh DESCRIPTION
+The
+.Nm
+driver provides support for the
+Sun Microsystems
+.Qq Sun-2
+.Tn SCSI
+Bus Controller chipset found on various
+VME boards
+.Pq Sun part #s 501-1045, 501-1138, 501-1149, and 501-1167
+and on the
+.Qq Sun-2 SCSI/Serial
+.Pq Sun part # 501-1006
+Multibus board.
+.Pp
+All
+versions of this driver can be configured with a
+.Em flags
+directive in the
+.Xr config 1
+file.
+The values are bits in a bitfield, and are interpreted as follows:
+.Pp
+.Bl -tag -offset indent -compact -width 0x000ff
+.It 0x0ff
+Set bit (1<<target) to disable
+.Tn SCSI
+parity checking
+.It 0x100
+Set this bit to disable
+.Tn DMA
+interrupts (poll)
+.It 0x200
+Set this bit to disable
+.Tn DMA
+entirely (use PIO)
+.El
+.Pp
+For example:
+.Qq flags 0x1ff
+would disable
+.Tn DMA
+interrupts, and disable parity checking for targets 0-7.
+The
+.Qq target
+is the
+.Tn SCSI
+ID number of a particular device on a particular
+.Tn SCSI
+bus.
+.Sh SEE ALSO
+.Xr cd 4 ,
+.Xr ch 4 ,
+.Xr intro 4 ,
+.Xr scsi 4 ,
+.Xr sd 4 ,
+.Xr st 4
+.Sh AUTHORS
+.An Matt Fredette
+.Aq fredette@NetBSD.org ,
+.An David Jones,
+.An Gordon Ross
+.Aq gwr@NetBSD.org ,
+.An Adam Glass
+.Aq glass@NetBSD.org ,
+.An Jason R. Thorpe
+.Aq thorpej@NetBSD.org .
+.Sh BUGS
+This
+.Tn SCSI
+chipset is rumored to have bugs in its handling of
+.Tn SCSI
+parity, therefore it is recommended that you disable parity
+on all
+.Tn SCSI
+devices connected to this controller, and configure it with
+a
+0x0ff
+value for its
+.Em flags
+directive in the
+.Xr config 1
+file.
+.Pp
+This
+chipset has no support for raising the
+.Tn ATN
+signal, so there is no way to ever schedule a
+.Tn MSG_OUT
+phase on the bus.  Currently, the driver will ultimately
+reset the bus if this phase is ever requested by the upper
+layer
+.Tn SCSI
+driver.
+.Pp
+This chipset has no support for
+.Tn SCSI
+disconnect/reselect.  This means that slow devices,
+such as tape drives, can hog, or
+.Qq lock up
+the SCSI bus.
+.Pp
+This driver has not been tested in combination with
+non-SCSI devices behind
+.Tn Emulex
+or
+.Tn Adaptec
+bridges, which are common in
+.Tn Sun
+2s and in
+.Tn Sun
+Shoebox-type configurations.
+These devices pre-date the
+.Tn SCSI-I
+spec, and might not behave the way the chipset code currently expects.