Emulate chip erase in terminal when pgm->chip_erase() soft fails

src/main.c

@@ -1395,7 +1395,10 @@ int main(int argc, char * argv [])
     } else {
       pmsg_info("erasing chip\n");
       exitrc = avr_chip_erase(pgm, p);
-      if(exitrc)
+      if(exitrc == LIBAVRDUDE_SOFTFAIL) {
+        imsg_info("delaying chip erase until first -U upload to flash\n");
+        exitrc = 1;
+      } else if(exitrc)
         goto main_exit;
     }
   }