diff --git a/cc3200/mptask.c b/cc3200/mptask.c
index eb673b08c..53910257b 100644
--- a/cc3200/mptask.c
+++ b/cc3200/mptask.c
@@ -175,7 +175,7 @@ soft_reset:
 
     if (!safeboot) {
         // run boot.py
-        int ret = pyexec_file("boot.py");
+        int ret = pyexec_file("boot.py", false);
         if (ret & PYEXEC_FORCED_EXIT) {
             goto soft_reset_exit;
         }
@@ -200,7 +200,7 @@ soft_reset:
             } else {
                 main_py = mp_obj_str_get_str(MP_STATE_PORT(machine_config_main));
             }
-            int ret = pyexec_file(main_py);
+            int ret = pyexec_file(main_py, false);
             if (ret & PYEXEC_FORCED_EXIT) {
                 goto soft_reset_exit;
             }
diff --git a/esp8266/main.c b/esp8266/main.c
index 71dfeb2ac..ce3b83dc3 100644
--- a/esp8266/main.c
+++ b/esp8266/main.c
@@ -63,8 +63,8 @@ STATIC void mp_reset(void) {
     dupterm_task_init();
 #if MICROPY_MODULE_FROZEN
     pyexec_frozen_module("_boot.py");
-    pyexec_file("boot.py");
-    pyexec_file("main.py");
+    pyexec_file("boot.py", true);
+    pyexec_file("main.py", true);
 #endif
 }
 
diff --git a/lib/utils/pyexec.c b/lib/utils/pyexec.c
index 411ee969d..0608c6e12 100644
--- a/lib/utils/pyexec.c
+++ b/lib/utils/pyexec.c
@@ -488,11 +488,17 @@ friendly_repl_reset:
 
 #endif // MICROPY_REPL_EVENT_DRIVEN
 
-int pyexec_file(const char *filename) {
+// This function is mostly intended to execute boot.py/main.py, i.e.
+// run in unattended mode. It has bool param because many people
+// find diagnostic message printed on board boot confusing (treat
+// it as "error"), so ports affected may silence them.
+int pyexec_file(const char *filename, bool silent) {
     mp_lexer_t *lex = mp_lexer_new_from_file(filename);
 
     if (lex == NULL) {
-        printf("could not open file '%s' for reading\n", filename);
+        if (!silent) {
+            printf("could not open file '%s' for reading\n", filename);
+        }
         return false;
     }
 
diff --git a/lib/utils/pyexec.h b/lib/utils/pyexec.h
index e0f62440e..79a80bfd3 100644
--- a/lib/utils/pyexec.h
+++ b/lib/utils/pyexec.h
@@ -38,7 +38,7 @@ extern pyexec_mode_kind_t pyexec_mode_kind;
 
 int pyexec_raw_repl(void);
 int pyexec_friendly_repl(void);
-int pyexec_file(const char *filename);
+int pyexec_file(const char *filename, bool silent);
 int pyexec_frozen_module(const char *name);
 void pyexec_event_repl_init(void);
 int pyexec_event_repl_process_char(int c);
diff --git a/stmhal/main.c b/stmhal/main.c
index 30dddaf98..659f5f02f 100644
--- a/stmhal/main.c
+++ b/stmhal/main.c
@@ -537,7 +537,7 @@ soft_reset:
         const char *boot_py = "boot.py";
         FRESULT res = f_stat(boot_py, NULL);
         if (res == FR_OK) {
-            int ret = pyexec_file(boot_py);
+            int ret = pyexec_file(boot_py, false);
             if (ret & PYEXEC_FORCED_EXIT) {
                 goto soft_reset_exit;
             }
@@ -598,7 +598,7 @@ soft_reset:
         }
         FRESULT res = f_stat(main_py, NULL);
         if (res == FR_OK) {
-            int ret = pyexec_file(main_py);
+            int ret = pyexec_file(main_py, false);
             if (ret & PYEXEC_FORCED_EXIT) {
                 goto soft_reset_exit;
             }
diff --git a/teensy/main.c b/teensy/main.c
index 41e445cb5..f0dc15a7c 100644
--- a/teensy/main.c
+++ b/teensy/main.c
@@ -304,7 +304,7 @@ soft_reset:
 #if MICROPY_MODULE_FROZEN
     pyexec_frozen_module("boot");
 #else
-    if (!pyexec_file("/boot.py")) {
+    if (!pyexec_file("/boot.py", false)) {
         flash_error(4);
     }
 #endif
@@ -324,7 +324,7 @@ soft_reset:
         } else {
             vstr_add_str(vstr, mp_obj_str_get_str(pyb_config_main));
         }
-        if (!pyexec_file(vstr_null_terminated_str(vstr))) {
+        if (!pyexec_file(vstr_null_terminated_str(vstr), false)) {
             flash_error(3);
         }
         vstr_free(vstr);