Take into account "memory_type" option to properly select boot mode (platformio#913)

Use correct bootloader `opi` when `"boot": "opi"` is not set for Arduino framework

Resolves platformio#837, enhances platformio#904

Author: Jason2866

builder/main.py

@@ -59,7 +59,11 @@ def _get_board_flash_mode(env):
 
 
 def _get_board_boot_mode(env):
-    return env.BoardConfig().get("build.boot", "$BOARD_FLASH_MODE")
+    memory_type = env.BoardConfig().get("build.arduino.memory_type", "")
+    build_boot = env.BoardConfig().get("build.boot", "$BOARD_FLASH_MODE")
+    if ["arduino"] == env.get("PIOFRAMEWORK") and memory_type in ("opi_opi", "opi_qspi"):
+        build_boot = "opi"
+    return build_boot
 
 
 def _parse_size(value):