ROMFS: purge old mixing system

- SYS_USE_IO is now off by default (enabled by default per board)

src/drivers/dshot/DShot.cpp

@@ -191,41 +191,6 @@ void DShot::enable_dshot_outputs(const bool enabled)
 				request_stop();
 				return;
 			}
-
-		} else {
-			DShotConfig config = (DShotConfig)_param_dshot_config.get();
-
-			unsigned int dshot_frequency = DSHOT600;
-
-			switch (config) {
-			case DShotConfig::DShot150:
-				dshot_frequency = DSHOT150;
-				break;
-
-			case DShotConfig::DShot300:
-				dshot_frequency = DSHOT300;
-				break;
-
-			case DShotConfig::DShot600:
-				dshot_frequency = DSHOT600;
-				break;
-
-			case DShotConfig::DShot1200:
-				dshot_frequency = DSHOT1200;
-				break;
-
-			default:
-				break;
-			}
-
-			int ret = up_dshot_init(_output_mask, dshot_frequency);
-
-			if (ret < 0) {
-				PX4_ERR("up_dshot_init failed (%i)", ret);
-				return;
-			}
-
-			_output_mask = ret;
 		}
 
 		_outputs_initialized = true;

src/drivers/dshot/DShot.h

@@ -177,7 +177,6 @@ private:
 	uORB::Publication<vehicle_command_ack_s> _command_ack_pub{ORB_ID(vehicle_command_ack)};
 
 	DEFINE_PARAMETERS(
-		(ParamInt<px4::params::DSHOT_CONFIG>)   _param_dshot_config,
 		(ParamFloat<px4::params::DSHOT_MIN>)    _param_dshot_min,
 		(ParamBool<px4::params::DSHOT_3D_ENABLE>) _param_dshot_3d_enable,
 		(ParamInt<px4::params::DSHOT_3D_DEAD_H>) _param_dshot_3d_dead_h,

src/drivers/dshot/module.yaml

@@ -8,24 +8,6 @@ serial_config:
 parameters:
     - group: DShot
       definitions:
-        DSHOT_CONFIG:
-            description:
-                short: Configure DShot
-                long: |
-                    This enables/disables DShot. The different modes define different
-                    speeds, for example DShot150 = 150kb/s. Not all ESCs support all modes.
-
-                    Note: this enables DShot on the FMU outputs. For boards with an IO it is the
-                    AUX outputs.
-            type: enum
-            values:
-                0: Disable (use PWM/Oneshot)
-                150: DShot150
-                300: DShot300
-                600: DShot600
-                1200: DShot1200
-            reboot_required: true
-            default: 0
         DSHOT_MIN:
             description:
                 short: Minimum DShot Motor Output

src/drivers/px4io/px4io_params.c

@@ -52,7 +52,7 @@
  * @reboot_required true
  * @group System
  */
-PARAM_DEFINE_INT32(SYS_USE_IO, 1);
+PARAM_DEFINE_INT32(SYS_USE_IO, 0);
 
 /**
  * S.BUS out