190 lines
3.5 KiB
Groff
190 lines
3.5 KiB
Groff
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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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.Dd May 7, 1998
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.Dt SI 4
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.Os NetBSD
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.Sh NAME
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.Nm si ,
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.Nm sw
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.Nd NCR 5380 SCSI bus host adaptor driver
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.Sh SYNOPSIS
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.Ss sun3
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.Cd "si0 at obio0 addr 0x140000 ipl 2"
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.Ss sun3 and sun3x
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.Cd "si0 at vme2 addr 0x200000 ipl 2 vect 0x40"
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.Cd "si1 at vme2 addr 0x204000 ipl 2 vect 0x41"
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.Ss sun3/E
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.Cd "sebuf0 at vme2 addr 0x300000 ipl 2 vect 0x74 # and 0x75"
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.Cd "sebuf1 at vme2 addr 0x340000 ipl 2 vect 0x76 # and 0x77"
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.Cd "si* at sebuf?"
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.Ss sun4
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.Cd "si0 at vme0 addr 0x200000 pri 2 vec 0x40"
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.Ss sun4/100
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.Cd "sw0 at obio0 addr 0x0a000000 level 3"
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.Sh DESCRIPTION
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The
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.Nm
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and
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.Nm sw
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.Qq Tn SCSI Weird
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drivers provide support for the
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.Tn NCR
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5380
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.Tn SCSI
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Bus Controller (SBC) chip found on various Sun Microsystems
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.Tn CPU
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motherboards (obio), and on the
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.Qq Sun-3 VME SCSI
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.Pq Sun part # 501-1236
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board used in systems with
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.Tn VME
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bus.
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.Ss sun3 and sun3x
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The
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.Tn sun3
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and
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.Tn sun3x
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version 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 0x000ff
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Set bit (1<<target) to disable
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.Tn SCSI
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disconnect/reselect
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.It 0x0ff00
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Set bit (1<<(target+8)) to disable
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.Tn SCSI
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parity checking
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.It 0x10000
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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 0x20000
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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 0x1000f
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would disable
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.Tn DMA
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interrupts, and disable disconnect/reselect for targets 0-3.
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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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.Ss sun4
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The
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.Tn sun4
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version of this driver can also 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 0x01
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.It 0x01
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Use
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.Tn DMA
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.Pq may be polled
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.It 0x02
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Use
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.Tn DMA
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completion interrupts
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.It 0x04
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Allow
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.Tn SCSI
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disconnect/reselect
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.El
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.Pp
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For example:
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.Qq flags 0x07
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would enable
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.Tn DMA ,
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interrupts, and reselect.
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By default,
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.Tn DMA
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is enabled in the
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.Tn sun4
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driver.
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.Sh BUGS
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The
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.Tn VME
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variant has a bit to enable or disable the
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.Tn DMA
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engine, but that bit also gates the interrupt line from the
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.Tn NCR5380
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.Pq !! .
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Therefore, in order to get any interrupt from the
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.Tn NCR5380 ,
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(i.e. for reselect) one must clear the
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.Tn DMA
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engine transfer count and then enable
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.Tn DMA .
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This has the further complication that you CAN NOT touch the
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.Tn NCR5380
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while the
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.Tn DMA
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enable bit is set, so we have to turn
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.Tn DMA
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back off before we even look at the
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.Tn NCR5380 .
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.Pp
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Support for the Sun 4/100
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.Nm sw
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.Qq Tn SCSI Weird
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is not complete.
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.Tn DMA
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works, but interrupts (and, thus, reselection) don't for reasons unknown.
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Further progress has halted pending the availability of a machine for testing.
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.Pp
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.Tn DMA ,
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.Tn DMA
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completion interrupts, and reselection work fine on a Sun 4/260 with modern
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.Tn SCSI-II
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disks attached.
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There have been reports of reselection failing on
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.Tn Sun
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Shoebox-type configurations where
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there are multiple 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.
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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 NCR5380 code expects.
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For this reason, only
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.Tn DMA
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is enabled by default in the
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.Tn sun4
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driver.
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.Sh SEE ALSO
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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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.Xr cd 4 ,
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.Xr ch 4
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.Sh AUTHOR
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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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