137 lines
2.6 KiB
Groff
137 lines
2.6 KiB
Groff
.\" $NetBSD: sc.4,v 1.5 2002/02/13 08:17:45 ross Exp $
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.\"
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.\" written from a reading of config files and driver source code
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.\" Erik E. Fair <fair@netbsd.org>
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.\" Matt Fredette <fredette@netbsd.org>
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.Dd June 28, 2001
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.Dt SC 4
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.Os
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.Sh NAME
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.Nm sc
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.Nd Sun Sun-2 SCSI bus host adaptor driver
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.Sh SYNOPSIS
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.Ss sun2
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.Cd "sc0 at mbmem0 addr 0x80000 ipl 2"
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.Cd "sc1 at mbmem0 addr 0x84000 ipl 2"
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.Ss sun2 and sun4
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.Cd "sc0 at vme0 addr 0x200000 irq 2 vec 0x40"
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.Sh DESCRIPTION
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The
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.Nm
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driver provides support for the
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Sun Microsystems
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.Qq Sun-2
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.Tn SCSI
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Bus Controller chipset found on various
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VME boards
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.Pq Sun part #s 501-1045, 501-1138, 501-1149, and 501-1167
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and on the
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.Qq Sun-2 SCSI/Serial
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.Pq Sun part # 501-1006
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Multibus board.
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.Pp
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All
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versions of this driver can be configured with a
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.Em flags
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directive in the
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.Xr config 8
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file.
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The values are bits in a bitfield, and are interpreted as follows:
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.Pp
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.Bl -tag -offset indent -compact -width 0x000ff
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.It 0x0ff
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Set bit (1\*[Lt]\*[Lt]target) to disable
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.Tn SCSI
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parity checking
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.It 0x100
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Set this bit to disable
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.Tn DMA
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interrupts (poll)
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.It 0x200
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Set this bit to disable
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.Tn DMA
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entirely (use PIO)
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.El
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.Pp
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For example:
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.Qq flags 0x1ff
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would disable
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.Tn DMA
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interrupts, and disable parity checking for targets 0-7.
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The
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.Qq target
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is the
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.Tn SCSI
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ID number of a particular device on a particular
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.Tn SCSI
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bus.
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.Sh SEE ALSO
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.Xr cd 4 ,
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.Xr ch 4 ,
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.Xr intro 4 ,
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.Xr scsi 4 ,
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.Xr sd 4 ,
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.Xr st 4
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.Sh AUTHORS
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Matt Fredette,
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.Aq fredette@netbsd.org ,
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.br
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David Jones,
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.br
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Gordon Ross
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.Aq gwr@netbsd.org ,
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.br
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Adam Glass
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.Aq glass@netbsd.org ,
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.br
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Jason R. Thorpe
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.Aq thorpej@netbsd.org .
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.Sh BUGS
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This
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.Tn SCSI
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chipset is rumored to have bugs in its handling of
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.Tn SCSI
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parity, therefore it is recommended that you disable parity
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on all
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.Tn SCSI
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devices connected to this controller, and configure it with
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a
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0x0ff
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value for its
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.Em flags
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directive in the
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.Xr config 8
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file.
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.Pp
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This
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chipset has no support for raising the
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.Tn ATN
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signal, so there is no way to ever schedule a
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.Tn MSG_OUT
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phase on the bus. Currently, the driver will ultimately
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reset the bus if this phase is ever requested by the upper
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layer
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.Tn SCSI
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driver.
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.Pp
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This chipset has no support for
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.Tn SCSI
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disconnect/reselect. This means that slow devices,
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such as tape drives, can hog, or
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.Qq lock up
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the SCSI bus.
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.Pp
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This driver has not been tested in combination with
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non-SCSI devices behind
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.Tn Emulex
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or
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.Tn Adaptec
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bridges, which are common in
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.Tn Sun
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2s and in
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.Tn Sun
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Shoebox-type configurations.
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These devices pre-date the
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.Tn SCSI-I
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spec, and might not behave the way the chipset code currently expects.
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