diff --git a/tools/kwboot.c b/tools/kwboot.c
index dee86cf..e00958a 100644
--- a/tools/kwboot.c
+++ b/tools/kwboot.c
@@ -76,6 +76,7 @@
 
 static int msg_req_delay = KWBOOT_MSG_REQ_DELAY;
 static int msg_rsp_timeo = KWBOOT_MSG_RSP_TIMEO;
+static int blk_rsp_timeo = KWBOOT_BLK_RSP_TIMEO;
 
 static void
 kwboot_printv(const char *fmt, ...)
@@ -380,7 +381,7 @@
 			break;
 
 		do {
-			rc = kwboot_tty_recv(fd, &c, 1, KWBOOT_BLK_RSP_TIMEO);
+			rc = kwboot_tty_recv(fd, &c, 1, blk_rsp_timeo);
 			if (rc)
 				break;
 
@@ -696,6 +697,8 @@
 	fprintf(stream, "  -a: use timings for Armada XP\n");
 	fprintf(stream, "  -q <req-delay>:  use specific request-delay\n");
 	fprintf(stream, "  -s <resp-timeo>: use specific response-timeout\n");
+	fprintf(stream,
+		"  -o <block-timeo>: use specific xmodem block timeout\n");
 	fprintf(stream, "\n");
 	fprintf(stream, "  -t: mini terminal\n");
 	fprintf(stream, "\n");
@@ -728,7 +731,7 @@
 	kwboot_verbose = isatty(STDOUT_FILENO);
 
 	do {
-		int c = getopt(argc, argv, "hb:ptaB:dD:q:s:");
+		int c = getopt(argc, argv, "hb:ptaB:dD:q:s:o:");
 		if (c < 0)
 			break;
 
@@ -768,6 +771,10 @@
 			msg_rsp_timeo = atoi(optarg);
 			break;
 
+		case 'o':
+			blk_rsp_timeo = atoi(optarg);
+			break;
+
 		case 'B':
 			speed = kwboot_tty_speed(atoi(optarg));
 			if (speed == -1)