define

esphome/components/esp32/__init__.py

@@ -1036,12 +1036,12 @@ async def to_code(config):
     # Set minimum chip revision for ESP32 variant
     # Setting this to 3.0 or higher reduces flash size by excluding workaround code,
     # and for PSRAM users saves significant IRAM by keeping C library functions in ROM.
-    if (
-        variant == VARIANT_ESP32
-        and (min_rev := conf[CONF_ADVANCED].get(CONF_MINIMUM_CHIP_REVISION)) is not None
-    ):
-        for rev, flag in ESP32_CHIP_REVISIONS.items():
-            add_idf_sdkconfig_option(flag, rev == min_rev)
+    if variant == VARIANT_ESP32:
+        min_rev = conf[CONF_ADVANCED].get(CONF_MINIMUM_CHIP_REVISION)
+        if min_rev is not None:
+            for rev, flag in ESP32_CHIP_REVISIONS.items():
+                add_idf_sdkconfig_option(flag, rev == min_rev)
+            cg.add_define("USE_ESP32_MIN_CHIP_REVISION_SET")
     add_idf_sdkconfig_option("CONFIG_PARTITION_TABLE_SINGLE_APP", False)
     add_idf_sdkconfig_option("CONFIG_PARTITION_TABLE_CUSTOM", True)
     add_idf_sdkconfig_option("CONFIG_PARTITION_TABLE_CUSTOM_FILENAME", "partitions.csv")

esphome/core/application.cpp

@@ -212,6 +212,12 @@ void Application::loop() {
       esp_chip_info(&chip_info);
       ESP_LOGI(TAG, "ESP32 Chip: %s r%d.%d, %d core(s)", ESPHOME_VARIANT, chip_info.revision / 100,
                chip_info.revision % 100, chip_info.cores);
+#if defined(USE_ESP32_VARIANT_ESP32) && !defined(USE_ESP32_MIN_CHIP_REVISION_SET)
+      // Suggest optimization for chips that don't need the PSRAM cache workaround
+      if (chip_info.revision >= 300) {
+        ESP_LOGW(TAG, "Set minimum_chip_revision: \"3.0\" to reduce binary size");
+      }
+#endif
 #endif
     }
 

esphome/core/defines.h

@@ -169,6 +169,7 @@
 #define USE_MQTT_IDF_ENQUEUE
 #define USE_ESPHOME_TASK_LOG_BUFFER
 #define USE_OTA_ROLLBACK
+#define USE_ESP32_MIN_CHIP_REVISION_SET
 
 #define USE_BLUETOOTH_PROXY
 #define BLUETOOTH_PROXY_MAX_CONNECTIONS 3