ar71xx: fix sysupgrade on the TL-WR841N/ND v7 boards

[openwrt.git] / tools / firmware-utils / src / ptgen.c

diff --git a/tools/firmware-utils/src/ptgen.c b/tools/firmware-utils/src/ptgen.c
index 8733e25..d94aabb 100644 (file)
--- a/tools/firmware-utils/src/ptgen.c
+++ b/tools/firmware-utils/src/ptgen.c
@@ -143,7 +143,7 @@ static int gen_ptable(int nr)
                printf("%ld\n", ((long) len * 512));
        }
 
-       if ((fd = open(filename, O_WRONLY|O_CREAT, 0644)) < 0) {
+       if ((fd = open(filename, O_WRONLY|O_CREAT|O_TRUNC, 0644)) < 0) {
                fprintf(stderr, "Can't open output file '%s'\n",filename);
                return -1;
        }