Add a unaligned_print option (alpha only)

Document osf1_enable

Submitted by:	Eric D. Futch <efutch@nyct.net>
PR:		21649

etc/defaults/rc.conf

@@ -296,6 +296,7 @@ kern_securelevel_enable="NO"	# kernel security level (see init(8)),
 kern_securelevel="-1"	# range: -1..3 ; `-1' is the most insecure
 update_motd="YES"	# update version info in /etc/motd (or NO)
 start_vinum=""		# set to YES to start vinum
+unaligned_print="YES"	# print unaligned access warnings on the alpha (or NO).
 entropy_file="/var/db/entropy"
 			# Set to NO to disable caching entropy through reboots
 

etc/etc.alpha/rc.alpha

@@ -165,3 +165,11 @@ if [ -n "${allscreens_flags}" ] ; then
 fi
 
 echo '.'
+
+# knob for wether or not we should print out unaligned access warnings
+#
+case ${unaligned_print} in
+[Nn][Oo])
+       sysctl -w machdep.unaligned_print=0
+       ;;
+esac

share/man/man5/rc.conf.5

@@ -1157,6 +1157,11 @@ this specifies a list of additional iBCS2 loaders to enable.
 .Ar YES
 if you wish to enable Linux/ELF binary emulation at system initial
 boot time.
+.It Ar osf1_enable
+(bool) Set to
+.Ar YES
+if you wish to enable OSF/1 (Digital UNIX) binary emulation at system
+initial boot time. (alpha)
 .It Ar clear_tmp_enable
 (bool) Set to
 .Ar YES
@@ -1216,6 +1221,10 @@ is set to
 these are the flags to pass to the
 .Xr sshd 8
 daemon.
+.It Ar unaligned_print
+(bool) If set to  
+.Ar NO
+then unaligned access warnings will not be printed. (alpha)
 .Sh FILES
 .Bl -tag -width /etc/defaults/rc.conf -compact
 .It Pa /etc/defaults/rc.conf