Merge pull request #1085 from seeseemelk/develop

Flash_loader: increase wait rounds for slow boards

src/stlink-lib/flash_loader.c

@@ -368,7 +368,7 @@ int stlink_flash_loader_run(stlink_t *sl, flash_loader_t* fl, stm32_addr_t targe
  * the OS uses, the wait until the error message is reduced to the same order of magnitude
  * as what was intended. -- REW.
  */
-#define WAIT_ROUNDS 30
+#define WAIT_ROUNDS 40
 
     // wait until done (reaches breakpoint)
     for (i = 0; i < WAIT_ROUNDS; i++) {