From b561d90ecd4ab0ac96c760bcf9df119973cd8611 Mon Sep 17 00:00:00 2001
From: George Talusan <george.talusan@gmail.com>
Date: Sat, 27 Feb 2016 11:41:39 -0500
Subject: [PATCH] be quicker about determining erased byte pattern when
 flashing

---
 src/stlink-common.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/src/stlink-common.c b/src/stlink-common.c
index 90d71f31e..86b48737e 100644
--- a/src/stlink-common.c
+++ b/src/stlink-common.c
@@ -1972,11 +1972,11 @@ int stlink_fwrite_flash(stlink_t *sl, const char* path, stm32_addr_t addr) {
         ELOG("map_file() == -1\n");
         return -1;
     }
-    for(index = 0; index < mf.len; index ++) {
-        if (mf.base[index] == erased_pattern)
-            num_empty ++;
-        else
-            num_empty = 0;
+    for(index = mf.len - 1; index >= 0; index --) {
+        if (mf.base[index] != erased_pattern) {
+            break;
+        }
+        num_empty ++;
     }
     /* Round down to words */
     num_empty -= (num_empty & 3);