esp32c2: Correct revision reading, deprecate eco0 stub

Author: radimkarnis

esptool.py

@@ -2417,7 +2417,8 @@ class ESP32C2ROM(ESP32C3ROM):
     DROM_MAP_START = 0x3c000000
     DROM_MAP_END   = 0x3c400000
 
-    CHIP_DETECT_MAGIC_VALUE = [0x7c41a06f]
+    # Magic value for ESP32C2 ECO0 and ECO1 respectively
+    CHIP_DETECT_MAGIC_VALUE = [0x6F51306F, 0x7c41a06f]
 
     EFUSE_BASE = 0x60008800
     MAC_EFUSE_REG  = EFUSE_BASE + 0x040
@@ -2444,6 +2445,16 @@ def get_chip_description(self):
 
         return "%s (revision %d)" % (chip_name, chip_revision)
 
+    def get_chip_revision(self):
+        si = self.get_security_info()
+        return si["api_version"]
+
+    def _post_connect(self):
+        # ESP32C2 ECO0 is no longer supported by the flasher stub
+        if self.get_chip_revision() == 0:
+            self.stub_is_disabled = True
+            self.IS_STUB = False
+
 
 class ESP32C6BETAROM(ESP32C3ROM):
     CHIP_NAME = "ESP32-C6(beta)"