Allow the specification of the controller bus when wiring down scsi buses.

This is performed by using a line similar to:

controller scbus0 at ahc0 bus 1

to wire scbus0 to the second bus on an adaptec 2742T controller.

Reviewed by: Peter Dufault(dufault@hda.com), Rod Grimes(rgrimes@FreeBSD.org)

1 files changed, 14 insertions, 4 deletions

diff --git a/share/man/man4/scsi.4 b/share/man/man4/scsi.4
index d38cdd3..fc97dc1 100644
--- a/share/man/man4/scsi.4
+++ b/share/man/man4/scsi.4
@@ -6,6 +6,9 @@
 .Nd scsi system
 .Sh SYNOPSIS
 .Nm controller scbus0
+.Nm controller scbus1 at ahc0
+.Nm controller scbus3 at ahc1 bus 0
+.Nm controller scbus2 at ahc1 bus 1
 .Nm device cd0
 .Nm device ch0
 .Nm disk sd0
@@ -41,11 +44,18 @@ config line similar to
 .Em "device ch0"
 to include the changer driver.
 .Pp
-To wire down a
-unit use a config line similar to
+To wire down a unit use a config line similar to
 .Em "device ch1 at scbus0 target 4 unit 0"
-to assign changer 1 as the changer with SCSI ID 4 SCSI logical unit 0 on
-SCSI bus 0.
+to assign changer 1 as the changer with SCSI ID 4,
+SCSI logical unit 0 on SCSI bus 0.
+Individual scbuses can be wired down to specific controllers with
+a config line similar to
+.Em "controller scbus0 at ahc0"
+which assigns scsi bus 0 to the first unit using the ahc driver.
+For controllers supporting more than one bus,
+the particualar bus can be specified as in
+.Em "controller scbus3 at ahc1 bus 1"
+which assigns scbus 1 to the second bus probled on the ahc1 device.
 .Pp
 When you have a mixture of wired down and counted devices then the
 counting begins with the first non-wired down unit for a particular