Merge stashed changes; use upstream flash.py

Boards.h

@@ -122,6 +122,8 @@
   #define MODEL_FE            0xFE // Homebrew board, max 17dBm output power
   #define MODEL_FF            0xFF // Homebrew board, max 14dBm output power
 
+  #define BOARD_MESHADVENTURER_S3   0xF2
+
   #if defined(__AVR_ATmega1284P__)
     #define PLATFORM PLATFORM_AVR
     #define MCU_VARIANT MCU_1284P
@@ -449,6 +451,50 @@
       const int pin_miso = 11;
       const int pin_sclk = 9;
 
+    #elif BOARD_MODEL == BOARD_MESHADVENTURER_S3
+      #define IS_ESP32S3 true
+      #define HAS_DISPLAY true
+      #define HAS_NP true
+      #define HAS_BLUETOOTH false
+      #define HAS_BLE true
+      #define HAS_WIFI true
+      #define HAS_CONSOLE true
+      #define HAS_EEPROM true
+      #define HAS_BUSY true
+      #define HAS_INPUT true
+      #define HAS_TCXO true
+      #define MODEM SX1262
+      #define DIO2_AS_RF_SWITCH false
+      #define HAS_RF_SWITCH_RX_TX true
+      #define HAS_LORA_LNA true
+      #define LORA_LNA_GAIN  30
+      #define LORA_LNA_GVT   14
+      #define PA_MAX_OUTPUT  22
+
+      const int pin_cs = 39;
+      const int pin_sclk = 38;
+      const int pin_miso = 40;
+      const int pin_mosi = 18;
+      const int pin_busy = 7;
+      const int pin_reset = 43;
+      const int pin_dio = 15;
+      const int pin_txen = 9;
+      const int pin_rxen = 8;
+      const int pin_tcxo_enable = -1;
+
+      const int pin_btn_usr1 = 4;
+      const int pin_np = 48;
+
+      #if HAS_NP == false
+        #if defined(EXTERNAL_LEDS)
+          const int pin_led_rx = 48;
+          const int pin_led_tx = 48;
+        #else
+          const int pin_led_rx = 48;
+          const int pin_led_tx = 48;
+        #endif
+      #endif
+
     #elif BOARD_MODEL == BOARD_RNODE_NG_20
       #define HAS_DISPLAY true
       #define HAS_BLUETOOTH true