--- a/loadtools/ltdispatch.c	Sun Mar 01 23:56:35 2020 +0000
+++ b/loadtools/ltdispatch.c	Mon Mar 02 00:21:12 2020 +0000
@@ -17,6 +17,7 @@
 extern int cmd_exit();
 extern int cmd_flash();
 extern int cmd_help();
+extern int cmd_timeout_cal();
 extern int loadtool_cmd_passthru();
 
 static struct cmdtab {
@@ -42,6 +43,7 @@
 	{"r8", 1, 1, loadtool_cmd_passthru},
 	{"r16", 1, 1, loadtool_cmd_passthru},
 	{"r32", 1, 1, loadtool_cmd_passthru},
+	{"timeout-cal", 1, 1, cmd_timeout_cal},
 	{"w8", 2, 2, loadtool_cmd_passthru},
 	{"w16", 2, 2, loadtool_cmd_passthru},
 	{"w32", 2, 2, loadtool_cmd_passthru},

--- a/loadtools/ltmisc.c	Sun Mar 01 23:56:35 2020 +0000
+++ b/loadtools/ltmisc.c	Mon Mar 02 00:21:12 2020 +0000
@@ -4,6 +4,7 @@
  */
 
 #include <sys/types.h>
+#include <sys/time.h>
 #include <stdio.h>
 #include <stdint.h>
 #include <stdlib.h>
@@ -58,3 +59,29 @@
 	printf("Saved to %s\n", argv[1]);
 	return(0);
 }
+
+cmd_timeout_cal(argc, argv)
+	char **argv;
+{
+	char *targv[3];
+	struct timeval time1, time2, diff;
+	int rc;
+
+	targv[0] = "sertimeout";
+	targv[1] = argv[1];
+	targv[2] = 0;
+	if (tpinterf_make_cmd(argv) < 0) {
+		fprintf(stderr, "error: unable to form target command\n");
+		return(-1);
+	}
+	if (tpinterf_send_cmd() < 0)
+		return(-1);
+	gettimeofday(&time1, 0);
+	rc = tpinterf_pass_output(60);
+	gettimeofday(&time2, 0);
+	if (rc)
+		return(rc);
+	timersub(&time2, &time1, &diff);
+	printf("%u.%06u s\n", (unsigned) diff.tv_sec, (unsigned) diff.tv_usec);
+	return(0);
+}