feat: Added warning when secure boot enabled

Warning message that the flash settings parameters won't be changed because of enabled secure boot

esptool/cmds.py

@@ -569,7 +569,13 @@ def write_flash(esp, args):
         if len(image) == 0:
             print("WARNING: File %s is empty" % argfile.name)
             continue
-        image = _update_image_flash_params(esp, address, args, image)
+
+        if not esp.get_secure_boot_enabled():
+            image = _update_image_flash_params(esp, address, args, image)
+        else:
+            print(
+                "WARNING: Secure boot is enabled, so not changing any flash settings."
+            )
         calcmd5 = hashlib.md5(image).hexdigest()
         uncsize = len(image)
         if compress:

esptool/targets/esp8266.py

@@ -178,6 +178,9 @@ def override_vddsdio(self, new_voltage):
     def check_spi_connection(self, spi_connection):
         raise NotSupportedError(self, "Setting --spi-connection")
 
+    def get_secure_boot_enabled(self):
+        return False  # ESP8266 doesn't have security features
+
 
 class ESP8266StubLoader(ESP8266ROM):
     """Access class for ESP8266 stub loader, runs on top of ROM."""