--- nono/host/hostcom.cpp	2026/04/29 17:05:51	1.1.1.9
+++ nono/host/hostcom.cpp	2026/04/29 17:05:56	1.1.1.10
@@ -131,18 +131,6 @@ HostCOMDevice::Create2()
 		return false;
 	}
 
-	// hostcom*-fallback は使わなくなったので、
-	// 初期値から変更されていれば警告だけ出す。
-	std::string key = GetConfigKey();
-	if (key != "debugger") {
-		const std::string fallback_key = key + "-fallback";
-		const ConfigItem& fallback_item = gConfig->Find(fallback_key);
-		if (fallback_item.GetFrom() != ConfigItem::FromInitial) {
-			warnx("Warning: option '%s' has been obsoleted.",
-				fallback_key.c_str());
-		}
-	}
-
 	if (SelectDriver(true) == false) {
 		return false;
 	}
@@ -422,7 +410,7 @@ HostCOMDevice::Write()
 }
 
 // ドライバ名を返す
-const std::string
+const std::string&
 HostCOMDevice::GetDriverName()
 {
 	RWLockGuard_Read guard(driverlock);
@@ -439,7 +427,8 @@ HostCOMDevice::MonitorUpdate(Monitor *,
 	screen.Print(0, 0, "Device(Port)  : %s", GetPortName().c_str());
 	{
 		RWLockGuard_Read gurad(driverlock);
-		screen.Print(0, 1, "HostCOM Driver: %s", driver->GetDriverName());
+		screen.Print(0, 1, "HostCOM Driver: %s",
+			driver->GetDriverName().c_str());
 		// 次の1行はドライバ依存情報
 		driver->MonitorUpdateMD(screen, 2);
 	}