Remove vestiges of watchdog support in heart

Hardware watchdog support was removed from heart in R13A, but there were
still some vestiges in the code and the documentation.

- Remove mentions of the HW_WD_DISABLE variable, as it's no longer used.
- Remove the HEART_BEAT_BOOT_DELAY variable, as it was only used for the
  hardware watchdog.

2 files changed, 10 insertions, 22 deletions

diff --git a/lib/kernel/doc/src/heart.xml b/lib/kernel/doc/src/heart.xml
index 59a046bf4d..5b5b71e521 100644
--- a/lib/kernel/doc/src/heart.xml
+++ b/lib/kernel/doc/src/heart.xml
@@ -37,10 +37,7 @@
       the <c>heart</c> port program is to check that the Erlang runtime system
       it is supervising is still running. If the port program has not
       received any heartbeats within <c>HEART_BEAT_TIMEOUT</c> seconds
-      (defaults to 60 seconds), the system can be rebooted. Also, if
-      the system is equipped with a hardware watchdog timer and is
-      running Solaris, the watchdog can be used to supervise the entire
-      system.</p>
+      (defaults to 60 seconds), the system can be rebooted.</p>
     <p>An Erlang runtime system to be monitored by a heart program
       is to be started with command-line flag <c>-heart</c> (see
       also <seealso marker="erts:erl"><c>erl(1)</c></seealso>).
@@ -51,17 +48,13 @@
       or a terminated Erlang runtime system, environment variable
       <c>HEART_COMMAND</c> must be set before the system is started.
       If this variable is not set, a warning text is printed but
-      the system does not reboot. However, if the hardware watchdog is
-      used, it still triggers a reboot <c>HEART_BEAT_BOOT_DELAY</c>
-      seconds later (defaults to 60 seconds).</p>
+      the system does not reboot.</p>
     <p>To reboot on Windows, <c>HEART_COMMAND</c> can be
       set to <c>heart -shutdown</c> (included in the Erlang delivery)
       or to any other suitable program that can activate a reboot.</p>
-    <p>The hardware watchdog is not started under Solaris if
-      environment variable <c>HW_WD_DISABLE</c> is set.</p>
-    <p>The environment variables <c>HEART_BEAT_TIMEOUT</c> and
-      <c>HEART_BEAT_BOOT_DELAY</c> can be used to configure the heart
-      time-outs; they can be set in the operating system shell before Erlang
+    <p>The environment variable <c>HEART_BEAT_TIMEOUT</c>
+      can be used to configure the heart
+      time-outs; it can be set in the operating system shell before Erlang
       is started or be specified at the command line:</p>
     <pre>
 % <input>erl -heart -env HEART_BEAT_TIMEOUT 30 ...</input></pre>
diff --git a/lib/kernel/src/heart.erl b/lib/kernel/src/heart.erl
index eea78aabdf..8fa48d56fb 100644
--- a/lib/kernel/src/heart.erl
+++ b/lib/kernel/src/heart.erl
@@ -198,16 +198,11 @@ start_portprogram() ->
     end.
 
 get_heart_timeouts() ->
-    HeartOpts = case os:getenv("HEART_BEAT_TIMEOUT") of
-		    false -> "";
-		    H when is_list(H) -> 
-			"-ht " ++ H
-		end,
-    HeartOpts ++ case os:getenv("HEART_BEAT_BOOT_DELAY") of
-		     false -> "";
-		     W when is_list(W) ->
-			 " -wt " ++ W
-		 end.
+    case os:getenv("HEART_BEAT_TIMEOUT") of
+	false -> "";
+	H when is_list(H) ->
+	    "-ht " ++ H
+    end.
 
 check_start_heart() ->
     case init:get_argument(heart) of