diff --git a/Makefile b/Makefile
index a641d79bd..eafe82f7a 100644
--- a/Makefile
+++ b/Makefile
@@ -90,6 +90,7 @@ FEATURES        =
 OFFICIAL_TARGETS  = ALIENFLIGHTF3 ALIENFLIGHTF4 ANYFCF7 BETAFLIGHTF3 BLUEJAYF4 CC3D FURYF4 NAZE REVO SIRINFPV SPARKY SPRACINGF3 SPRACINGF3EVO SPRACINGF3NEO SPRACINGF4EVO STM32F3DISCOVERY
 ALT_TARGETS       = $(sort $(filter-out target, $(basename $(notdir $(wildcard $(ROOT)/src/main/target/*/*.mk)))))
 OPBL_TARGETS      = $(filter %_OPBL, $(ALT_TARGETS))
+OSD_SLAVE_TARGETS = SPRACINGF3OSD
 
 VALID_TARGETS   = $(dir $(wildcard $(ROOT)/src/main/target/*/target.mk))
 VALID_TARGETS  := $(subst /,, $(subst ./src/main/target/,, $(VALID_TARGETS)))
@@ -188,6 +189,15 @@ ifeq ($(filter $(TARGET),$(OPBL_TARGETS)), $(TARGET))
 OPBL            = yes
 endif
 
+ifeq ($(filter $(TARGET),$(OSD_SLAVE_TARGETS)), $(TARGET))
+# build an OSD SLAVE
+OSD_SLAVE       = yes
+else
+# build an FC
+FC              = yes
+endif
+
+
 # silently ignore if the file is not present. Allows for target specific.
 -include $(ROOT)/src/main/target/$(BASE_TARGET)/target.mk
 
@@ -664,36 +674,53 @@ COMMON_SRC = \
             drivers/bus_spi_soft.c \
             drivers/display.c \
             drivers/exti.c \
-            drivers/gyro_sync.c \
             drivers/io.c \
             drivers/light_led.c \
             drivers/resource.c \
+            drivers/rcc.c \
+            drivers/serial.c \
+            drivers/serial_uart.c \
+            drivers/sound_beeper.c \
+            drivers/stack_check.c \
+            drivers/system.c \
+            drivers/timer.c \
+            drivers/transponder_ir.c \
+            fc/config.c \
+            fc/fc_dispatch.c \
+            fc/fc_hardfaults.c \
+            fc/fc_msp.c \
+            fc/fc_tasks.c \
+            fc/runtime_config.c \
+            io/beeper.c \
+            io/serial.c \
+            io/statusindicator.c \
+            io/transponder_ir.c \
+            msp/msp_serial.c \
+            scheduler/scheduler.c \
+            sensors/battery.c \
+            sensors/current.c \
+            sensors/voltage.c \
+
+OSD_SLAVE_SRC = \
+            io/displayport_max7456.c \
+            osd_slave/osd_slave_init.c \
+            io/osd_slave.c
+
+FC_SRC = \
+            fc/fc_init.c \
+            fc/controlrate_profile.c \
+            drivers/gyro_sync.c \
             drivers/rx_nrf24l01.c \
             drivers/rx_spi.c \
             drivers/rx_xn297.c \
             drivers/pwm_esc_detect.c \
             drivers/pwm_output.c \
-            drivers/rcc.c \
             drivers/rx_pwm.c \
-            drivers/serial.c \
-            drivers/serial_uart.c \
             drivers/serial_softserial.c \
-            drivers/sound_beeper.c \
-            drivers/stack_check.c \
-            drivers/system.c \
-            drivers/timer.c \
-            fc/config.c \
-            fc/controlrate_profile.c \
-            fc/fc_init.c \
-            fc/fc_dispatch.c \
-            fc/fc_hardfaults.c \
             fc/fc_core.c \
             fc/fc_rc.c \
-            fc/fc_msp.c \
-            fc/fc_tasks.c \
             fc/rc_adjustments.c \
             fc/rc_controls.c \
-            fc/runtime_config.c \
             fc/cli.c \
             flight/altitude.c \
             flight/failsafe.c \
@@ -701,13 +728,9 @@ COMMON_SRC = \
             flight/mixer.c \
             flight/pid.c \
             flight/servos.c \
-            io/beeper.c \
-            io/serial.c \
             io/serial_4way.c \
             io/serial_4way_avrootloader.c \
             io/serial_4way_stk500v2.c \
-            io/statusindicator.c \
-            msp/msp_serial.c \
             rx/ibus.c \
             rx/jetiexbus.c \
             rx/msp.c \
@@ -725,11 +748,7 @@ COMMON_SRC = \
             rx/sumd.c \
             rx/sumh.c \
             rx/xbus.c \
-            scheduler/scheduler.c \
             sensors/acceleration.c \
-            sensors/battery.c \
-            sensors/current.c \
-            sensors/voltage.c \
             sensors/boardalignment.c \
             sensors/compass.c \
             sensors/gyro.c \
@@ -761,8 +780,6 @@ COMMON_SRC = \
             io/gps.c \
             io/ledstrip.c \
             io/osd.c \
-            io/osd_slave.c \
-            io/transponder_ir.c \
             sensors/sonar.c \
             sensors/barometer.c \
             telemetry/telemetry.c \
@@ -779,10 +796,19 @@ COMMON_SRC = \
             io/vtx_string.c \
             io/vtx_smartaudio.c \
             io/vtx_tramp.c \
-            io/vtx.c \
+            io/vtx.c
+            
+COMMON_DEVICE_SRC = \
             $(CMSIS_SRC) \
             $(DEVICE_STDPERIPH_SRC)
 
+ifeq ($(OSD_SLAVE),yes)
+TARGET_FLAGS := -DUSE_OSD_SLAVE $(TARGET_FLAGS)
+COMMON_SRC := $(COMMON_SRC) $(OSD_SLAVE_SRC) $(COMMON_DEVICE_SRC)
+else
+COMMON_SRC := $(COMMON_SRC) $(FC_SRC) $(COMMON_DEVICE_SRC)
+endif
+
 
 SPEED_OPTIMISED_SRC := ""
 SIZE_OPTIMISED_SRC  := ""
diff --git a/src/main/blackbox/blackbox.c b/src/main/blackbox/blackbox.c
index a0c06a8c2..1c66e2826 100644
--- a/src/main/blackbox/blackbox.c
+++ b/src/main/blackbox/blackbox.c
@@ -35,7 +35,6 @@
 #include "common/maths.h"
 #include "common/utils.h"
 
-#include "config/config_profile.h"
 #include "config/feature.h"
 #include "config/parameter_group.h"
 #include "config/parameter_group_ids.h"
diff --git a/src/main/blackbox/blackbox_io.c b/src/main/blackbox/blackbox_io.c
index c69d10671..b39fe1a92 100644
--- a/src/main/blackbox/blackbox_io.c
+++ b/src/main/blackbox/blackbox_io.c
@@ -18,7 +18,6 @@
 #include "common/maths.h"
 #include "common/printf.h"
 
-#include "config/config_profile.h"
 #include "config/parameter_group.h"
 #include "config/parameter_group_ids.h"
 
diff --git a/src/main/cms/cms.c b/src/main/cms/cms.c
index f7e106a3e..cf0ce0bf3 100644
--- a/src/main/cms/cms.c
+++ b/src/main/cms/cms.c
@@ -45,7 +45,6 @@
 #include "drivers/system.h"
 
 // For rcData, stopAllMotors, stopPwmAllMotors
-#include "config/config_profile.h"
 #include "config/feature.h"
 #include "config/parameter_group.h"
 #include "config/parameter_group_ids.h"
diff --git a/src/main/cms/cms_menu_blackbox.c b/src/main/cms/cms_menu_blackbox.c
index 1429a2a6f..ac42ad85e 100644
--- a/src/main/cms/cms_menu_blackbox.c
+++ b/src/main/cms/cms_menu_blackbox.c
@@ -40,7 +40,6 @@
 
 #include "common/utils.h"
 
-#include "config/config_profile.h"
 #include "config/feature.h"
 #include "config/parameter_group.h"
 #include "config/parameter_group_ids.h"
diff --git a/src/main/cms/cms_menu_imu.c b/src/main/cms/cms_menu_imu.c
index 7d900dcee..4a1730c08 100644
--- a/src/main/cms/cms_menu_imu.c
+++ b/src/main/cms/cms_menu_imu.c
@@ -37,7 +37,6 @@
 
 #include "common/utils.h"
 
-#include "config/config_profile.h"
 #include "config/feature.h"
 #include "config/parameter_group.h"
 
diff --git a/src/main/cms/cms_menu_ledstrip.c b/src/main/cms/cms_menu_ledstrip.c
index fb6a38ec8..c422845ff 100644
--- a/src/main/cms/cms_menu_ledstrip.c
+++ b/src/main/cms/cms_menu_ledstrip.c
@@ -30,7 +30,6 @@
 #include "cms/cms_types.h"
 #include "cms/cms_menu_ledstrip.h"
 
-#include "config/config_profile.h"
 #include "config/feature.h"
 #include "config/parameter_group.h"
 #include "config/parameter_group_ids.h"
diff --git a/src/main/cms/cms_menu_misc.c b/src/main/cms/cms_menu_misc.c
index 079f15515..b257fb25f 100644
--- a/src/main/cms/cms_menu_misc.c
+++ b/src/main/cms/cms_menu_misc.c
@@ -34,7 +34,6 @@
 
 #include "common/utils.h"
 
-#include "config/config_profile.h"
 #include "config/feature.h"
 #include "config/parameter_group.h"
 #include "config/parameter_group_ids.h"
diff --git a/src/main/cms/cms_menu_osd.c b/src/main/cms/cms_menu_osd.c
index 6508ebe9b..4fc9f233c 100644
--- a/src/main/cms/cms_menu_osd.c
+++ b/src/main/cms/cms_menu_osd.c
@@ -32,7 +32,6 @@
 
 #include "common/utils.h"
 
-#include "config/config_profile.h"
 #include "config/feature.h"
 #include "config/parameter_group.h"
 #include "config/parameter_group_ids.h"
diff --git a/src/main/cms/cms_menu_vtx.c b/src/main/cms/cms_menu_vtx.c
index 91bde8125..0f14e4c3a 100644
--- a/src/main/cms/cms_menu_vtx.c
+++ b/src/main/cms/cms_menu_vtx.c
@@ -33,7 +33,6 @@
 
 #include "common/utils.h"
 
-#include "config/config_profile.h"
 #include "config/feature.h"
 #include "config/parameter_group.h"
 #include "config/parameter_group_ids.h"
diff --git a/src/main/drivers/timer.h b/src/main/drivers/timer.h
index a35c626af..67bfc6049 100644
--- a/src/main/drivers/timer.h
+++ b/src/main/drivers/timer.h
@@ -96,7 +96,7 @@ typedef struct timerHardware_s {
 #if defined(STM32F3) || defined(STM32F4) || defined(STM32F7)
     uint8_t alternateFunction;
 #endif
-#if defined(USE_DSHOT) || defined(LED_STRIP)
+#if defined(USE_DSHOT) || defined(LED_STRIP) || defined(TRANSPONDER)
 #if defined(STM32F4) || defined(STM32F7)
     DMA_Stream_TypeDef *dmaRef;
     uint32_t dmaChannel;
diff --git a/src/main/drivers/timer_def.h b/src/main/drivers/timer_def.h
index 35d107618..ba37d7e65 100644
--- a/src/main/drivers/timer_def.h
+++ b/src/main/drivers/timer_def.h
@@ -20,7 +20,7 @@
 #include <platform.h>
 #include "common/utils.h"
 
-#if defined(USE_DSHOT) || defined(LED_STRIP)
+#if defined(USE_DSHOT) || defined(LED_STRIP) || defined(TRANSPONDER)
 # define DEF_TIM_DMA_COND(...) __VA_ARGS__
 #else
 # define DEF_TIM_DMA_COND(...)
diff --git a/src/main/fc/cli.c b/src/main/fc/cli.c
index 1050444ed..19895751c 100755
--- a/src/main/fc/cli.c
+++ b/src/main/fc/cli.c
@@ -49,7 +49,6 @@ extern uint8_t __config_end;
 #include "common/utils.h"
 
 #include "config/config_eeprom.h"
-#include "config/config_profile.h"
 #include "config/feature.h"
 #include "config/parameter_group.h"
 #include "config/parameter_group_ids.h"
@@ -629,8 +628,10 @@ static const clivalue_t valueTable[] = {
     { "ibata_scale",                VAR_INT16  | MASTER_VALUE, .config.minmax = { -16000, 16000 }, PG_CURRENT_SENSOR_ADC_CONFIG, offsetof(currentSensorADCConfig_t, scale) },
     { "ibata_offset",               VAR_INT16  | MASTER_VALUE, .config.minmax = { -16000, 16000 }, PG_CURRENT_SENSOR_ADC_CONFIG, offsetof(currentSensorADCConfig_t, offset) },
 // PG_CURRENT_SENSOR_ADC_CONFIG
+#ifdef USE_VIRTUAL_CURRENT_METER
     { "ibatv_scale",                VAR_INT16  | MASTER_VALUE, .config.minmax = { -16000, 16000 }, PG_CURRENT_SENSOR_VIRTUAL_CONFIG, offsetof(currentSensorVirtualConfig_t, scale) },
     { "ibatv_offset",               VAR_INT16  | MASTER_VALUE, .config.minmax = { -16000, 16000 }, PG_CURRENT_SENSOR_VIRTUAL_CONFIG, offsetof(currentSensorVirtualConfig_t, offset) },
+#endif
 
 // PG_BEEPER_DEV_CONFIG
 #ifdef BEEPER
@@ -909,7 +910,9 @@ static servoParam_t servoParamsCopy[MAX_SUPPORTED_SERVOS];
 static batteryConfig_t batteryConfigCopy;
 static voltageSensorADCConfig_t voltageSensorADCConfigCopy[MAX_VOLTAGE_SENSOR_ADC];
 static currentSensorADCConfig_t currentSensorADCConfigCopy;
+#ifdef USE_VIRTUAL_CURRENT_METER
 static currentSensorVirtualConfig_t currentSensorVirtualConfigCopy;
+#endif
 static motorMixer_t customMotorMixerCopy[MAX_SUPPORTED_MOTORS];
 static mixerConfig_t mixerConfigCopy;
 static flight3DConfig_t flight3DConfigCopy;
@@ -1197,10 +1200,12 @@ static const cliCurrentAndDefaultConfig_t *getCurrentAndDefaultConfigs(pgn_t pgn
         ret.currentConfig = &currentSensorADCConfigCopy;
         ret.defaultConfig = currentSensorADCConfig();
         break;
+#ifdef USE_VIRTUAL_CURRENT_METER
     case PG_CURRENT_SENSOR_VIRTUAL_CONFIG:
         ret.currentConfig = &currentSensorVirtualConfigCopy;
         ret.defaultConfig = currentSensorVirtualConfig();
         break;
+#endif
     case PG_SERIAL_CONFIG:
         ret.currentConfig = &serialConfigCopy;
         ret.defaultConfig = serialConfig();
diff --git a/src/main/fc/config.c b/src/main/fc/config.c
index b808ce704..9265bd132 100755
--- a/src/main/fc/config.c
+++ b/src/main/fc/config.c
@@ -35,7 +35,6 @@
 #include "common/maths.h"
 
 #include "config/config_eeprom.h"
-#include "config/config_profile.h"
 #include "config/feature.h"
 #include "config/parameter_group.h"
 #include "config/parameter_group_ids.h"
@@ -98,7 +97,9 @@
 
 #include "telemetry/telemetry.h"
 
+#ifndef USE_OSD_SLAVE
 pidProfile_t *currentPidProfile;
+#endif
 
 #ifndef DEFAULT_FEATURES
 #define DEFAULT_FEATURES 0
@@ -118,13 +119,22 @@ PG_RESET_TEMPLATE(featureConfig_t, featureConfig,
 
 PG_REGISTER_WITH_RESET_TEMPLATE(systemConfig_t, systemConfig, PG_SYSTEM_CONFIG, 0);
 
+#ifndef USE_OSD_SLAVE
 PG_RESET_TEMPLATE(systemConfig_t, systemConfig,
     .pidProfileIndex = 0,
     .activeRateProfile = 0,
     .debug_mode = DEBUG_MODE,
     .task_statistics = true,
-    .name = { 0 }
+    .name = { 0 } // FIXME misplaced, see PG_PILOT_CONFIG in CF v1.x
 );
+#endif
+
+#ifdef USE_OSD_SLAVE
+PG_RESET_TEMPLATE(systemConfig_t, systemConfig,
+    .debug_mode = DEBUG_MODE,
+    .task_statistics = true
+);
+#endif
 
 #ifdef BEEPER
 PG_REGISTER(beeperConfig_t, beeperConfig, PG_BEEPER_CONFIG, 0);
@@ -447,6 +457,7 @@ void pgResetFn_statusLedConfig(statusLedConfig_t *statusLedConfig)
     ;
 }
 
+#ifndef USE_OSD_SLAVE
 uint8_t getCurrentPidProfileIndex(void)
 {
     return systemConfig()->pidProfileIndex;
@@ -470,6 +481,7 @@ uint16_t getCurrentMinthrottle(void)
 {
     return motorConfig()->minthrottle;
 }
+#endif
 
 void resetConfigs(void)
 {
@@ -481,8 +493,10 @@ void resetConfigs(void)
 
     pgActivateProfile(0);
 
+#ifndef USE_OSD_SLAVE
     setPidProfile(0);
     setControlRateProfile(0);
+#endif
 
 #ifdef LED_STRIP
     reevaluateLedConfig();
@@ -491,6 +505,7 @@ void resetConfigs(void)
 
 void activateConfig(void)
 {
+#ifndef USE_OSD_SLAVE
     generateThrottleCurve();
 
     resetAdjustmentStates();
@@ -509,10 +524,12 @@ void activateConfig(void)
     imuConfigure(throttleCorrectionConfig()->throttle_correction_angle);
 
     configureAltitudeHold(currentPidProfile);
+#endif
 }
 
 void validateAndFixConfig(void)
 {
+#ifndef USE_OSD_SLAVE
     if((motorConfig()->dev.motorPwmProtocol == PWM_TYPE_BRUSHED) && (motorConfig()->mincommand < 1000)){
         motorConfigMutable()->mincommand = 1000;
     }
@@ -571,22 +588,24 @@ void validateAndFixConfig(void)
     }
 #endif
 
-    if (!isSerialConfigValid(serialConfig())) {
-        pgResetFn_serialConfig(serialConfigMutable());
-    }
-
     // Prevent invalid notch cutoff
     if (currentPidProfile->dterm_notch_cutoff >= currentPidProfile->dterm_notch_hz) {
         currentPidProfile->dterm_notch_hz = 0;
     }
 
     validateAndFixGyroConfig();
+#endif
+
+    if (!isSerialConfigValid(serialConfig())) {
+        pgResetFn_serialConfig(serialConfigMutable());
+    }
 
 #if defined(TARGET_VALIDATECONFIG)
     targetValidateConfiguration();
 #endif
 }
 
+#ifndef USE_OSD_SLAVE
 void validateAndFixGyroConfig(void)
 {
     // Prevent invalid notch cutoff
@@ -662,16 +681,19 @@ void validateAndFixGyroConfig(void)
             motorConfigMutable()->dev.motorPwmRate = maxEscRate;
     }
 }
+#endif
 
 void readEEPROM(void)
 {
+#ifndef USE_OSD_SLAVE
     suspendRxSignal();
+#endif
 
     // Sanity check, read flash
     if (!loadEEPROM()) {
         failureMode(FAILURE_INVALID_EEPROM_CONTENTS);
     }
-
+#ifndef USE_OSD_SLAVE
     if (systemConfig()->activeRateProfile >= CONTROL_RATE_PROFILE_COUNT) {// sanity check
         systemConfigMutable()->activeRateProfile = 0;
     }
@@ -681,20 +703,27 @@ void readEEPROM(void)
         systemConfigMutable()->pidProfileIndex = 0;
     }
     setPidProfile(systemConfig()->pidProfileIndex);
+#endif
 
     validateAndFixConfig();
     activateConfig();
 
+#ifndef USE_OSD_SLAVE
     resumeRxSignal();
+#endif
 }
 
 void writeEEPROM(void)
 {
+#ifndef USE_OSD_SLAVE
     suspendRxSignal();
+#endif
 
     writeConfigToEEPROM();
 
+#ifndef USE_OSD_SLAVE
     resumeRxSignal();
+#endif
 }
 
 void resetEEPROM(void)
@@ -718,6 +747,7 @@ void saveConfigAndNotify(void)
     beeperConfirmationBeeps(1);
 }
 
+#ifndef USE_OSD_SLAVE
 void changePidProfile(uint8_t pidProfileIndex)
 {
     if (pidProfileIndex >= MAX_PROFILE_COUNT) {
@@ -727,6 +757,7 @@ void changePidProfile(uint8_t pidProfileIndex)
     currentPidProfile = pidProfilesMutable(pidProfileIndex);
     beeperConfirmationBeeps(pidProfileIndex + 1);
 }
+#endif
 
 void beeperOffSet(uint32_t mask)
 {
diff --git a/src/main/fc/config.h b/src/main/fc/config.h
index 08d439e55..8fcf6ab68 100644
--- a/src/main/fc/config.h
+++ b/src/main/fc/config.h
@@ -30,8 +30,6 @@
 #include "drivers/sound_beeper.h"
 #include "drivers/vcd.h"
 
-#define MAX_NAME_LENGTH 16
-
 typedef enum {
     FEATURE_RX_PPM = 1 << 0,
     //FEATURE_VBAT = 1 << 1,
@@ -64,13 +62,24 @@ typedef enum {
     FEATURE_ANTI_GRAVITY = 1 << 28,
 } features_e;
 
+#define MAX_NAME_LENGTH 16
+
+#ifndef USE_OSD_SLAVE
 typedef struct systemConfig_s {
     uint8_t pidProfileIndex;
     uint8_t activeRateProfile;
     uint8_t debug_mode;
     uint8_t task_statistics;
-    char name[MAX_NAME_LENGTH + 1];
+    char name[MAX_NAME_LENGTH + 1]; // FIXME misplaced, see PG_PILOT_CONFIG in CF v1.x
 } systemConfig_t;
+#endif
+
+#ifdef USE_OSD_SLAVE
+typedef struct systemConfig_s {
+    uint8_t debug_mode;
+    uint8_t task_statistics;
+} systemConfig_t;
+#endif
 
 PG_DECLARE(systemConfig_t, systemConfig);
 PG_DECLARE(adcConfig_t, adcConfig);
diff --git a/src/main/fc/fc_core.c b/src/main/fc/fc_core.c
index 6c0cf3b10..69f0d5603 100644
--- a/src/main/fc/fc_core.c
+++ b/src/main/fc/fc_core.c
@@ -29,7 +29,6 @@
 #include "common/maths.h"
 #include "common/utils.h"
 
-#include "config/config_profile.h"
 #include "config/feature.h"
 #include "config/parameter_group.h"
 #include "config/parameter_group_ids.h"
diff --git a/src/main/fc/fc_hardfaults.c b/src/main/fc/fc_hardfaults.c
index 11ca57d2e..5164cc00f 100644
--- a/src/main/fc/fc_hardfaults.c
+++ b/src/main/fc/fc_hardfaults.c
@@ -93,11 +93,14 @@ void HardFault_Handler(void)
 {
     LED2_ON;
 
+#ifndef USE_OSD_SLAVE
     // fall out of the sky
     uint8_t requiredStateForMotors = SYSTEM_STATE_CONFIG_LOADED | SYSTEM_STATE_MOTORS_READY;
     if ((systemState & requiredStateForMotors) == requiredStateForMotors) {
         stopMotors();
     }
+#endif
+
 #ifdef TRANSPONDER
     // prevent IR LEDs from burning out.
     uint8_t requiredStateForTransponder = SYSTEM_STATE_CONFIG_LOADED | SYSTEM_STATE_TRANSPONDER_ENABLED;
diff --git a/src/main/fc/fc_init.c b/src/main/fc/fc_init.c
index 9bcc7d2e5..09dde1fa1 100644
--- a/src/main/fc/fc_init.c
+++ b/src/main/fc/fc_init.c
@@ -29,7 +29,6 @@
 #include "common/printf.h"
 
 #include "config/config_eeprom.h"
-#include "config/config_profile.h"
 #include "config/feature.h"
 #include "config/parameter_group.h"
 #include "config/parameter_group_ids.h"
diff --git a/src/main/fc/fc_msp.c b/src/main/fc/fc_msp.c
index 845e1228c..a95c133ff 100755
--- a/src/main/fc/fc_msp.c
+++ b/src/main/fc/fc_msp.c
@@ -34,7 +34,6 @@
 #include "common/streambuf.h"
 
 #include "config/config_eeprom.h"
-#include "config/config_profile.h"
 #include "config/feature.h"
 #include "config/parameter_group.h"
 #include "config/parameter_group_ids.h"
@@ -94,9 +93,10 @@
 
 #include "scheduler/scheduler.h"
 
+#include "sensors/battery.h"
+
 #include "sensors/acceleration.h"
 #include "sensors/barometer.h"
-#include "sensors/battery.h"
 #include "sensors/boardalignment.h"
 #include "sensors/compass.h"
 #include "sensors/gyro.h"
@@ -109,11 +109,10 @@
 #include "hardware_revision.h"
 #endif
 
-extern uint16_t cycleTime; // FIXME dependency on mw.c
-
 static const char * const flightControllerIdentifier = BETAFLIGHT_IDENTIFIER; // 4 UPPER CASE alpha numeric characters that identify the flight controller.
 static const char * const boardIdentifier = TARGET_BOARD_IDENTIFIER;
 
+#ifndef USE_OSD_SLAVE
 static const box_t boxes[CHECKBOX_ITEM_COUNT + 1] = {
     { BOXARM, "ARM", 0 },
     { BOXANGLE, "ANGLE", 1 },
@@ -180,6 +179,7 @@ typedef enum {
 } mspSDCardFlags_e;
 
 #define RATEPROFILE_MASK (1 << 7)
+#endif
 
 #ifdef USE_SERIAL_4WAY_BLHELI_INTERFACE
 #define ESC_4WAY 0xff
@@ -216,8 +216,8 @@ static void mspFc4waySerialCommand(sbuf_t *dst, sbuf_t *src, mspPostProcessFnPtr
         if (mspPostProcessFn) {
             *mspPostProcessFn = esc4wayProcess;
         }
-
         break;
+
 #ifdef USE_ESCSERIAL
     case PROTOCOL_SIMONK:
     case PROTOCOL_BLHELI:
@@ -244,13 +244,16 @@ static void mspRebootFn(serialPort_t *serialPort)
 {
     UNUSED(serialPort);
 
+#ifndef USE_OSD_SLAVE
     stopPwmAllMotors();
+#endif
     systemReset();
 
     // control should never return here.
     while (true) ;
 }
 
+#ifndef USE_OSD_SLAVE
 const box_t *findBoxByBoxId(uint8_t boxId)
 {
     for (uint8_t boxIndex = 0; boxIndex < sizeof(boxes) / sizeof(box_t); boxIndex++) {
@@ -452,21 +455,20 @@ static void serializeSDCardSummaryReply(sbuf_t *dst)
         switch (afatfs_getFilesystemState()) {
         case AFATFS_FILESYSTEM_STATE_READY:
             state = MSP_SDCARD_STATE_READY;
-
             break;
+
         case AFATFS_FILESYSTEM_STATE_INITIALIZATION:
             if (sdcard_isInitialized()) {
                 state = MSP_SDCARD_STATE_FS_INIT;
             } else {
                 state = MSP_SDCARD_STATE_CARD_INIT;
             }
-
             break;
+
         case AFATFS_FILESYSTEM_STATE_FATAL:
         case AFATFS_FILESYSTEM_STATE_UNKNOWN:
         default:
             state = MSP_SDCARD_STATE_FATAL;
-
             break;
         }
     }
@@ -537,12 +539,13 @@ static void serializeDataflashReadReply(sbuf_t *dst, uint32_t address, const uin
     }
 }
 #endif
+#endif
 
 /*
  * Returns true if the command was processd, false otherwise.
  * May set mspPostProcessFunc to a function to be called once the command has been processed
  */
-static bool mspFcProcessOutCommand(uint8_t cmdMSP, sbuf_t *dst, mspPostProcessFnPtr *mspPostProcessFn)
+static bool mspCommonProcessOutCommand(uint8_t cmdMSP, sbuf_t *dst, mspPostProcessFnPtr *mspPostProcessFn)
 {
     switch (cmdMSP) {
     case MSP_API_VERSION:
@@ -585,6 +588,247 @@ static bool mspFcProcessOutCommand(uint8_t cmdMSP, sbuf_t *dst, mspPostProcessFn
         sbufWriteData(dst, shortGitRevision, GIT_SHORT_REVISION_LENGTH);
         break;
 
+    case MSP_REBOOT:
+        if (mspPostProcessFn) {
+            *mspPostProcessFn = mspRebootFn;
+        }
+        break;
+
+    case MSP_ANALOG:
+        sbufWriteU8(dst, (uint8_t)constrain(getBatteryVoltage(), 0, 255));
+        sbufWriteU16(dst, (uint16_t)constrain(getMAhDrawn(), 0, 0xFFFF)); // milliamp hours drawn from battery
+        sbufWriteU16(dst, 0); // rssi
+        sbufWriteU16(dst, (int16_t)constrain(getAmperage(), -0x8000, 0x7FFF)); // send current in 0.01 A steps, range is -320A to 320A
+        break;
+
+    case MSP_DEBUG:
+        // output some useful QA statistics
+        // debug[x] = ((hse_value / 1000000) * 1000) + (SystemCoreClock / 1000000);         // XX0YY [crystal clock : core clock]
+
+        for (int i = 0; i < DEBUG16_VALUE_COUNT; i++) {
+            sbufWriteU16(dst, debug[i]);      // 4 variables are here for general monitoring purpose
+        }
+        break;
+
+    case MSP_UID:
+        sbufWriteU32(dst, U_ID_0);
+        sbufWriteU32(dst, U_ID_1);
+        sbufWriteU32(dst, U_ID_2);
+        break;
+
+    case MSP_FEATURE_CONFIG:
+        sbufWriteU32(dst, featureMask());
+        break;
+
+    case MSP_BATTERY_STATE: {
+        // battery characteristics
+        sbufWriteU8(dst, (uint8_t)constrain(getBatteryCellCount(), 0, 255)); // 0 indicates battery not detected.
+        sbufWriteU16(dst, batteryConfig()->batteryCapacity); // in mAh
+
+        // battery state
+        sbufWriteU8(dst, (uint8_t)constrain(getBatteryVoltage(), 0, 255)); // in 0.1V steps
+        sbufWriteU16(dst, (uint16_t)constrain(getMAhDrawn(), 0, 0xFFFF)); // milliamp hours drawn from battery
+        sbufWriteU16(dst, (int16_t)constrain(getAmperage(), -0x8000, 0x7FFF)); // send current in 0.01 A steps, range is -320A to 320A
+
+        // battery alerts
+        sbufWriteU8(dst, (uint8_t)getBatteryState());
+        break;
+    }
+
+    case MSP_VOLTAGE_METERS:
+        // write out id and voltage meter values, once for each meter we support
+        for (int i = 0; i < supportedVoltageMeterCount; i++) {
+
+            voltageMeter_t meter;
+            uint8_t id = (uint8_t)voltageMeterIds[i];
+            voltageMeterRead(id, &meter);
+
+            sbufWriteU8(dst, id);
+            sbufWriteU8(dst, (uint8_t)constrain(meter.filtered, 0, 255));
+        }
+        break;
+
+    case MSP_CURRENT_METERS:
+        // write out id and current meter values, once for each meter we support
+        for (int i = 0; i < supportedCurrentMeterCount; i++) {
+
+            currentMeter_t meter;
+            uint8_t id = (uint8_t)currentMeterIds[i];
+            currentMeterRead(id, &meter);
+
+            sbufWriteU8(dst, id);
+            sbufWriteU16(dst, (uint16_t)constrain(meter.mAhDrawn, 0, 0xFFFF)); // milliamp hours drawn from battery
+            sbufWriteU16(dst, (uint16_t)constrain(meter.amperage * 10, 0, 0xFFFF)); // send amperage in 0.001 A steps (mA). Negative range is truncated to zero
+        }
+        break;
+
+    case MSP_VOLTAGE_METER_CONFIG:
+        // by using a sensor type and a sub-frame length it's possible to configure any type of voltage meter,
+        // e.g. an i2c/spi/can sensor or any sensor not built directly into the FC such as ESC/RX/SPort/SBus that has
+        // different configuration requirements.
+        BUILD_BUG_ON(VOLTAGE_SENSOR_ADC_VBAT != 0); // VOLTAGE_SENSOR_ADC_VBAT should be the first index,
+        sbufWriteU8(dst, MAX_VOLTAGE_SENSOR_ADC); // voltage meters in payload
+        for (int i = VOLTAGE_SENSOR_ADC_VBAT; i < MAX_VOLTAGE_SENSOR_ADC; i++) {
+            const uint8_t adcSensorSubframeLength = 1 + 1 + 1 + 1 + 1; // length of id, type, vbatscale, vbatresdivval, vbatresdivmultipler, in bytes
+            sbufWriteU8(dst, adcSensorSubframeLength); // ADC sensor sub-frame length
+
+            sbufWriteU8(dst, voltageMeterADCtoIDMap[i]); // id of the sensor
+            sbufWriteU8(dst, VOLTAGE_SENSOR_TYPE_ADC_RESISTOR_DIVIDER); // indicate the type of sensor that the next part of the payload is for
+
+            sbufWriteU8(dst, voltageSensorADCConfig(i)->vbatscale);
+            sbufWriteU8(dst, voltageSensorADCConfig(i)->vbatresdivval);
+            sbufWriteU8(dst, voltageSensorADCConfig(i)->vbatresdivmultiplier);
+        }
+        // if we had any other voltage sensors, this is where we would output any needed configuration
+        break;
+
+    case MSP_CURRENT_METER_CONFIG: {
+        // the ADC and VIRTUAL sensors have the same configuration requirements, however this API reflects
+        // that this situation may change and allows us to support configuration of any current sensor with
+        // specialist configuration requirements.
+
+        int currentMeterCount = 1;
+
+#ifdef USE_VIRTUAL_CURRENT_METER
+        currentMeterCount++;
+#endif
+        sbufWriteU8(dst, currentMeterCount);
+
+        const uint8_t adcSensorSubframeLength = 1 + 1 + 2 + 2; // length of id, type, scale, offset, in bytes
+        sbufWriteU8(dst, adcSensorSubframeLength);
+        sbufWriteU8(dst, CURRENT_METER_ID_BATTERY_1); // the id of the meter
+        sbufWriteU8(dst, CURRENT_SENSOR_ADC); // indicate the type of sensor that the next part of the payload is for
+        sbufWriteU16(dst, currentSensorADCConfig()->scale);
+        sbufWriteU16(dst, currentSensorADCConfig()->offset);
+
+#ifdef USE_VIRTUAL_CURRENT_METER
+        const int8_t virtualSensorSubframeLength = 1 + 1 + 2 + 2; // length of id, type, scale, offset, in bytes
+        sbufWriteU8(dst, virtualSensorSubframeLength);
+        sbufWriteU8(dst, CURRENT_METER_ID_VIRTUAL_1); // the id of the meter
+        sbufWriteU8(dst, CURRENT_SENSOR_VIRTUAL); // indicate the type of sensor that the next part of the payload is for
+        sbufWriteU16(dst, currentSensorVirtualConfig()->scale);
+        sbufWriteU16(dst, currentSensorVirtualConfig()->offset);
+#endif
+
+        // if we had any other current sensors, this is where we would output any needed configuration
+        break;
+    }
+
+    case MSP_BATTERY_CONFIG:
+        sbufWriteU8(dst, batteryConfig()->vbatmincellvoltage);
+        sbufWriteU8(dst, batteryConfig()->vbatmaxcellvoltage);
+        sbufWriteU8(dst, batteryConfig()->vbatwarningcellvoltage);
+        sbufWriteU16(dst, batteryConfig()->batteryCapacity);
+        sbufWriteU8(dst, batteryConfig()->voltageMeterSource);
+        sbufWriteU8(dst, batteryConfig()->currentMeterSource);
+        break;
+
+    case MSP_TRANSPONDER_CONFIG:
+#ifdef TRANSPONDER
+        sbufWriteU8(dst, 1); //Transponder supported
+        for (unsigned int i = 0; i < sizeof(transponderConfig()->data); i++) {
+            sbufWriteU8(dst, transponderConfig()->data[i]);
+        }
+#else
+        sbufWriteU8(dst, 0); // Transponder not supported
+#endif
+        break;
+
+    case MSP_OSD_CONFIG: {
+#define OSD_FLAGS_OSD_FEATURE           (1 << 0)
+#define OSD_FLAGS_OSD_SLAVE             (1 << 1)
+#define OSD_FLAGS_RESERVED_1            (1 << 2)
+#define OSD_FLAGS_RESERVED_2            (1 << 3)
+#define OSD_FLAGS_OSD_HARDWARE_MAX_7456 (1 << 4)
+
+        uint8_t osdFlags = 0;
+#if defined(OSD)
+        osdFlags |= OSD_FLAGS_OSD_FEATURE;
+#endif
+#if defined(USE_OSD_SLAVE)
+        osdFlags |= OSD_FLAGS_OSD_SLAVE;
+#endif
+#ifdef USE_MAX7456
+        osdFlags |= OSD_FLAGS_OSD_HARDWARE_MAX_7456;
+#endif
+
+        sbufWriteU8(dst, osdFlags);
+
+#ifdef USE_MAX7456
+        // send video system (AUTO/PAL/NTSC)
+        sbufWriteU8(dst, vcdProfile()->video_system);
+#else
+        sbufWriteU8(dst, 0);
+#endif
+
+#ifdef OSD
+        // OSD specific, not applicable to OSD slaves.
+        sbufWriteU8(dst, osdConfig()->units);
+        sbufWriteU8(dst, osdConfig()->rssi_alarm);
+        sbufWriteU16(dst, osdConfig()->cap_alarm);
+        sbufWriteU16(dst, osdConfig()->time_alarm);
+        sbufWriteU16(dst, osdConfig()->alt_alarm);
+        for (int i = 0; i < OSD_ITEM_COUNT; i++) {
+            sbufWriteU16(dst, osdConfig()->item_pos[i]);
+        }
+#endif
+        break;
+    }
+
+    default:
+        return false;
+    }
+    return true;
+}
+
+#ifdef USE_OSD_SLAVE
+static bool mspOsdSlaveProcessOutCommand(uint8_t cmdMSP, sbuf_t *dst, mspPostProcessFnPtr *mspPostProcessFn)
+{
+    UNUSED(mspPostProcessFn);
+
+    switch (cmdMSP) {
+    case MSP_STATUS_EX:
+        sbufWriteU16(dst, 0); // task delta
+#ifdef USE_I2C
+        sbufWriteU16(dst, i2cGetErrorCounter());
+#else
+        sbufWriteU16(dst, 0);
+#endif
+        sbufWriteU16(dst, 0); // sensors
+        sbufWriteU32(dst, 0); // flight modes
+        sbufWriteU8(dst, 0); // profile
+        sbufWriteU16(dst, constrain(averageSystemLoadPercent, 0, 100));
+        sbufWriteU8(dst, 1); // max profiles
+        sbufWriteU8(dst, 0); // control rate profile
+        break;
+
+    case MSP_STATUS:
+        sbufWriteU16(dst, 0); // task delta
+#ifdef USE_I2C
+        sbufWriteU16(dst, i2cGetErrorCounter());
+#else
+        sbufWriteU16(dst, 0);
+#endif
+        sbufWriteU16(dst, 0); // sensors
+        sbufWriteU32(dst, 0); // flight modes
+        sbufWriteU8(dst, 0); // profile
+        sbufWriteU16(dst, constrain(averageSystemLoadPercent, 0, 100));
+        sbufWriteU16(dst, 0); // gyro cycle time
+        break;
+
+    default:
+        return false;
+    }
+    return true;
+}
+#endif
+
+#ifndef USE_OSD_SLAVE
+static bool mspFcProcessOutCommand(uint8_t cmdMSP, sbuf_t *dst, mspPostProcessFnPtr *mspPostProcessFn)
+{
+    UNUSED(mspPostProcessFn);
+
+    switch (cmdMSP) {
     case MSP_STATUS_EX:
         sbufWriteU16(dst, getTaskDeltaTime(TASK_GYROPID));
 #ifdef USE_I2C
@@ -600,15 +844,6 @@ static bool mspFcProcessOutCommand(uint8_t cmdMSP, sbuf_t *dst, mspPostProcessFn
         sbufWriteU8(dst, getCurrentControlRateProfileIndex());
         break;
 
-    case MSP_NAME:
-        {
-            const int nameLen = strlen(systemConfig()->name);
-            for (int i = 0; i < nameLen; i++) {
-                sbufWriteU8(dst, systemConfig()->name[i]);
-            }
-        }
-        break;
-
     case MSP_STATUS:
         sbufWriteU16(dst, getTaskDeltaTime(TASK_GYROPID));
 #ifdef USE_I2C
@@ -639,6 +874,15 @@ static bool mspFcProcessOutCommand(uint8_t cmdMSP, sbuf_t *dst, mspPostProcessFn
         }
         break;
 
+    case MSP_NAME:
+        {
+            const int nameLen = strlen(systemConfig()->name);
+            for (int i = 0; i < nameLen; i++) {
+                sbufWriteU8(dst, systemConfig()->name[i]);
+            }
+        }
+        break;
+
 #ifdef USE_SERVOS
     case MSP_SERVO:
         sbufWriteData(dst, &servo, MAX_SUPPORTED_SERVOS * 2);
@@ -649,12 +893,11 @@ static bool mspFcProcessOutCommand(uint8_t cmdMSP, sbuf_t *dst, mspPostProcessFn
             sbufWriteU16(dst, servoParams(i)->max);
             sbufWriteU16(dst, servoParams(i)->middle);
             sbufWriteU8(dst, servoParams(i)->rate);
-            sbufWriteU8(dst, servoParams(i)->angleAtMin);
-            sbufWriteU8(dst, servoParams(i)->angleAtMax);
             sbufWriteU8(dst, servoParams(i)->forwardFromChannel);
             sbufWriteU32(dst, servoParams(i)->reversedSources);
         }
         break;
+
     case MSP_SERVO_MIX_RULES:
         for (int i = 0; i < MAX_SERVO_RULES; i++) {
             sbufWriteU8(dst, customServoMixers(i)->targetChannel);
@@ -708,11 +951,10 @@ static bool mspFcProcessOutCommand(uint8_t cmdMSP, sbuf_t *dst, mspPostProcessFn
 #endif
         break;
 
-    case MSP_ANALOG:
-        sbufWriteU8(dst, (uint8_t)constrain(getBatteryVoltage(), 0, 255));
-        sbufWriteU16(dst, (uint16_t)constrain(getMAhDrawn(), 0, 0xFFFF)); // milliamp hours drawn from battery
-        sbufWriteU16(dst, rssi);
-        sbufWriteU16(dst, (int16_t)constrain(getAmperage(), -0x8000, 0x7FFF)); // send current in 0.01 A steps, range is -320A to 320A
+    case MSP_BOARD_ALIGNMENT_CONFIG:
+        sbufWriteU16(dst, boardAlignment()->rollDegrees);
+        sbufWriteU16(dst, boardAlignment()->pitchDegrees);
+        sbufWriteU16(dst, boardAlignment()->yawDegrees);
         break;
 
     case MSP_ARMING_CONFIG:
@@ -836,130 +1078,11 @@ static bool mspFcProcessOutCommand(uint8_t cmdMSP, sbuf_t *dst, mspPostProcessFn
         break;
 #endif
 
-    case MSP_DEBUG:
-        // output some useful QA statistics
-        // debug[x] = ((hse_value / 1000000) * 1000) + (SystemCoreClock / 1000000);         // XX0YY [crystal clock : core clock]
-
-        for (int i = 0; i < DEBUG16_VALUE_COUNT; i++) {
-            sbufWriteU16(dst, debug[i]);      // 4 variables are here for general monitoring purpose
-        }
-        break;
-
     case MSP_ACC_TRIM:
         sbufWriteU16(dst, accelerometerConfig()->accelerometerTrims.values.pitch);
         sbufWriteU16(dst, accelerometerConfig()->accelerometerTrims.values.roll);
         break;
 
-    case MSP_UID:
-        sbufWriteU32(dst, U_ID_0);
-        sbufWriteU32(dst, U_ID_1);
-        sbufWriteU32(dst, U_ID_2);
-        break;
-
-    case MSP_FEATURE_CONFIG:
-        sbufWriteU32(dst, featureMask());
-        break;
-
-    case MSP_BOARD_ALIGNMENT_CONFIG:
-        sbufWriteU16(dst, boardAlignment()->rollDegrees);
-        sbufWriteU16(dst, boardAlignment()->pitchDegrees);
-        sbufWriteU16(dst, boardAlignment()->yawDegrees);
-        break;
-
-    case MSP_BATTERY_STATE: {
-        // battery characteristics
-        sbufWriteU8(dst, (uint8_t)constrain(getBatteryCellCount(), 0, 255)); // 0 indicates battery not detected.
-        sbufWriteU16(dst, batteryConfig()->batteryCapacity); // in mAh
-
-        // battery state
-        sbufWriteU8(dst, (uint8_t)constrain(getBatteryVoltage(), 0, 255)); // in 0.1V steps
-        sbufWriteU16(dst, (uint16_t)constrain(getMAhDrawn(), 0, 0xFFFF)); // milliamp hours drawn from battery
-        sbufWriteU16(dst, (int16_t)constrain(getAmperage(), -0x8000, 0x7FFF)); // send current in 0.01 A steps, range is -320A to 320A
-
-        // battery alerts
-        sbufWriteU8(dst, (uint8_t)getBatteryState());
-        break;
-    }
-    case MSP_VOLTAGE_METERS:
-        // write out id and voltage meter values, once for each meter we support
-        for (int i = 0; i < supportedVoltageMeterCount; i++) {
-
-            voltageMeter_t meter;
-            uint8_t id = (uint8_t)voltageMeterIds[i];
-            voltageMeterRead(id, &meter);
-
-            sbufWriteU8(dst, id);
-            sbufWriteU8(dst, (uint8_t)constrain(meter.filtered, 0, 255));
-        }
-        break;
-
-    case MSP_CURRENT_METERS:
-        // write out id and current meter values, once for each meter we support
-        for (int i = 0; i < supportedCurrentMeterCount; i++) {
-
-            currentMeter_t meter;
-            uint8_t id = (uint8_t)currentMeterIds[i];
-            currentMeterRead(id, &meter);
-
-            sbufWriteU8(dst, id);
-            sbufWriteU16(dst, (uint16_t)constrain(meter.mAhDrawn, 0, 0xFFFF)); // milliamp hours drawn from battery
-            sbufWriteU16(dst, (uint16_t)constrain(meter.amperage * 10, 0, 0xFFFF)); // send amperage in 0.001 A steps (mA). Negative range is truncated to zero
-        }
-        break;
-
-    case MSP_VOLTAGE_METER_CONFIG:
-        // by using a sensor type and a sub-frame length it's possible to configure any type of voltage meter,
-        // e.g. an i2c/spi/can sensor or any sensor not built directly into the FC such as ESC/RX/SPort/SBus that has
-        // different configuration requirements.
-        BUILD_BUG_ON(VOLTAGE_SENSOR_ADC_VBAT != 0); // VOLTAGE_SENSOR_ADC_VBAT should be the first index,
-        sbufWriteU8(dst, MAX_VOLTAGE_SENSOR_ADC); // voltage meters in payload
-        for (int i = VOLTAGE_SENSOR_ADC_VBAT; i < MAX_VOLTAGE_SENSOR_ADC; i++) {
-            const uint8_t adcSensorSubframeLength = 1 + 1 + 1 + 1 + 1; // length of id, type, vbatscale, vbatresdivval, vbatresdivmultipler, in bytes
-            sbufWriteU8(dst, adcSensorSubframeLength); // ADC sensor sub-frame length
-
-            sbufWriteU8(dst, voltageMeterADCtoIDMap[i]); // id of the sensor
-            sbufWriteU8(dst, VOLTAGE_SENSOR_TYPE_ADC_RESISTOR_DIVIDER); // indicate the type of sensor that the next part of the payload is for
-
-            sbufWriteU8(dst, voltageSensorADCConfig(i)->vbatscale);
-            sbufWriteU8(dst, voltageSensorADCConfig(i)->vbatresdivval);
-            sbufWriteU8(dst, voltageSensorADCConfig(i)->vbatresdivmultiplier);
-        }
-        // if we had any other voltage sensors, this is where we would output any needed configuration
-        break;
-
-    case MSP_CURRENT_METER_CONFIG: {
-        // the ADC and VIRTUAL sensors have the same configuration requirements, however this API reflects
-        // that this situation may change and allows us to support configuration of any current sensor with
-        // specialist configuration requirements.
-
-        sbufWriteU8(dst, 2); // current meters in payload (adc + virtual)
-
-        const uint8_t adcSensorSubframeLength = 1 + 1 + 2 + 2; // length of id, type, scale, offset, in bytes
-        sbufWriteU8(dst, adcSensorSubframeLength);
-        sbufWriteU8(dst, CURRENT_METER_ID_BATTERY_1); // the id of the sensor
-        sbufWriteU8(dst, CURRENT_SENSOR_ADC); // indicate the type of sensor that the next part of the payload is for
-        sbufWriteU16(dst, currentSensorADCConfig()->scale);
-        sbufWriteU16(dst, currentSensorADCConfig()->offset);
-
-        const int8_t virtualSensorSubframeLength = 1 + 1 + 2 + 2; // length of id, type, scale, offset, in bytes
-        sbufWriteU8(dst, virtualSensorSubframeLength);
-        sbufWriteU8(dst, CURRENT_METER_ID_VIRTUAL_1); // the id of the sensor
-        sbufWriteU8(dst, CURRENT_SENSOR_VIRTUAL); // indicate the type of sensor that the next part of the payload is for
-        sbufWriteU16(dst, currentSensorVirtualConfig()->scale);
-        sbufWriteU16(dst, currentSensorVirtualConfig()->offset);
-
-        // if we had any other current sensors, this is where we would output any needed configuration
-        break;
-    }
-    case MSP_BATTERY_CONFIG:
-        sbufWriteU8(dst, batteryConfig()->vbatmincellvoltage);
-        sbufWriteU8(dst, batteryConfig()->vbatmaxcellvoltage);
-        sbufWriteU8(dst, batteryConfig()->vbatwarningcellvoltage);
-        sbufWriteU16(dst, batteryConfig()->batteryCapacity);
-        sbufWriteU8(dst, batteryConfig()->voltageMeterSource);
-        sbufWriteU8(dst, batteryConfig()->currentMeterSource);
-        break;
-
     case MSP_MIXER_CONFIG:
         sbufWriteU8(dst, mixerConfig()->mixerMode);
         break;
@@ -1094,58 +1217,6 @@ static bool mspFcProcessOutCommand(uint8_t cmdMSP, sbuf_t *dst, mspPostProcessFn
         serializeSDCardSummaryReply(dst);
         break;
 
-    case MSP_TRANSPONDER_CONFIG:
-#ifdef TRANSPONDER
-        sbufWriteU8(dst, 1); //Transponder supported
-        for (unsigned int i = 0; i < sizeof(transponderConfig()->data); i++) {
-            sbufWriteU8(dst, transponderConfig()->data[i]);
-        }
-#else
-        sbufWriteU8(dst, 0); // Transponder not supported
-#endif
-        break;
-
-    case MSP_OSD_CONFIG: {
-
-#define OSD_FLAGS_OSD_FEATURE           (1 << 0)
-#define OSD_FLAGS_OSD_SLAVE             (1 << 1)
-#define OSD_FLAGS_RESERVED_1            (1 << 2)
-#define OSD_FLAGS_RESERVED_2            (1 << 3)
-#define OSD_FLAGS_OSD_HARDWARE_MAX_7456 (1 << 4)
-
-        uint8_t osdFlags = 0;
-#if defined(OSD)
-        osdFlags |= OSD_FLAGS_OSD_FEATURE;
-#endif
-#if defined(USE_OSD_SLAVE)
-        osdFlags |= OSD_FLAGS_OSD_SLAVE;
-#endif
-#ifdef USE_MAX7456
-        osdFlags |= OSD_FLAGS_OSD_HARDWARE_MAX_7456;
-#endif
-
-        sbufWriteU8(dst, osdFlags);
-
-#ifdef USE_MAX7456
-        // send video system (AUTO/PAL/NTSC)
-        sbufWriteU8(dst, vcdProfile()->video_system);
-#else
-        sbufWriteU8(dst, 0);
-#endif
-
-#ifdef OSD
-        // OSD specific, not applicable to OSD slaves.
-        sbufWriteU8(dst, osdConfig()->units);
-        sbufWriteU8(dst, osdConfig()->rssi_alarm);
-        sbufWriteU16(dst, osdConfig()->cap_alarm);
-        sbufWriteU16(dst, osdConfig()->time_alarm);
-        sbufWriteU16(dst, osdConfig()->alt_alarm);
-        for (int i = 0; i < OSD_ITEM_COUNT; i++) {
-            sbufWriteU16(dst, osdConfig()->item_pos[i]);
-        }
-#endif
-        break;
-    }
     case MSP_MOTOR_3D_CONFIG:
         sbufWriteU16(dst, flight3DConfig()->deadband3d_low);
         sbufWriteU16(dst, flight3DConfig()->deadband3d_high);
@@ -1218,12 +1289,6 @@ static bool mspFcProcessOutCommand(uint8_t cmdMSP, sbuf_t *dst, mspPostProcessFn
         sbufWriteU8(dst, compassConfig()->mag_hardware);
         break;
 
-    case MSP_REBOOT:
-        if (mspPostProcessFn) {
-            *mspPostProcessFn = mspRebootFn;
-        }
-        break;
-
 #if defined(VTX_COMMON)
     case MSP_VTX_CONFIG:
         {
@@ -1258,6 +1323,7 @@ static bool mspFcProcessOutCommand(uint8_t cmdMSP, sbuf_t *dst, mspPostProcessFn
     }
     return true;
 }
+#endif
 
 #ifdef GPS
 static void mspFcWpCommand(sbuf_t *dst, sbuf_t *src)
@@ -1301,6 +1367,16 @@ static void mspFcDataFlashReadCommand(sbuf_t *dst, sbuf_t *src)
 }
 #endif
 
+#ifdef USE_OSD_SLAVE
+static mspResult_e mspOsdSlaveProcessInCommand(uint8_t cmdMSP, sbuf_t *src) {
+    UNUSED(cmdMSP);
+    UNUSED(src);
+    // Nothing OSD SLAVE specific yet.
+    return MSP_RESULT_ERROR;
+}
+#endif
+
+#ifndef USE_OSD_SLAVE
 static mspResult_e mspFcProcessInCommand(uint8_t cmdMSP, sbuf_t *src)
 {
     uint32_t i;
@@ -1637,75 +1713,6 @@ static mspResult_e mspFcProcessInCommand(uint8_t cmdMSP, sbuf_t *src)
         break;
 #endif
 
-#ifdef TRANSPONDER
-    case MSP_SET_TRANSPONDER_CONFIG:
-        if (dataSize != sizeof(transponderConfig()->data)) {
-            return MSP_RESULT_ERROR;
-        }
-        for (unsigned int i = 0; i < sizeof(transponderConfig()->data); i++) {
-            transponderConfigMutable()->data[i] = sbufReadU8(src);
-        }
-        transponderUpdateData();
-        break;
-#endif
-
-#if defined(OSD) || defined (USE_OSD_SLAVE)
-    case MSP_SET_OSD_CONFIG:
-        {
-            const uint8_t addr = sbufReadU8(src);
-            // set all the other settings
-            if ((int8_t)addr == -1) {
-#ifdef USE_MAX7456
-                vcdProfileMutable()->video_system = sbufReadU8(src);
-#else
-                sbufReadU8(src); // Skip video system
-#endif
-#if defined(OSD)
-                osdConfigMutable()->units = sbufReadU8(src);
-                osdConfigMutable()->rssi_alarm = sbufReadU8(src);
-                osdConfigMutable()->cap_alarm = sbufReadU16(src);
-                osdConfigMutable()->time_alarm = sbufReadU16(src);
-                osdConfigMutable()->alt_alarm = sbufReadU16(src);
-#endif
-            } else {
-#if defined(OSD)
-                // set a position setting
-                const uint16_t pos  = sbufReadU16(src);
-                if (addr < OSD_ITEM_COUNT) {
-                    osdConfigMutable()->item_pos[addr] = pos;
-                }
-#else
-                return MSP_RESULT_ERROR;
-#endif
-            }
-        }
-        break;
-
-    case MSP_OSD_CHAR_WRITE:
-#ifdef USE_MAX7456
-        {
-            uint8_t font_data[64];
-            const uint8_t addr = sbufReadU8(src);
-            for (int i = 0; i < 54; i++) {
-                font_data[i] = sbufReadU8(src);
-            }
-            // !!TODO - replace this with a device independent implementation
-            max7456WriteNvm(addr, font_data);
-        }
-#else
-        return MSP_RESULT_ERROR;
-/*
-        // just discard the data
-        sbufReadU8(src);
-        for (int i = 0; i < 54; i++) {
-            sbufReadU8(src);
-        }
-*/
-#endif
-        break;
-#endif // OSD || USE_OSD_SLAVE
-
-
 #if defined(USE_RTC6705) || defined(VTX_COMMON)
     case MSP_SET_VTX_CONFIG:
         {
@@ -1768,6 +1775,7 @@ static mspResult_e mspFcProcessInCommand(uint8_t cmdMSP, sbuf_t *src)
         GPS_speed = sbufReadU16(src);
         GPS_update |= 2;        // New data signalisation to GPS functions // FIXME Magic Numbers
         break;
+
     case MSP_SET_WP:
         wp_no = sbufReadU8(src);    //get the wp number
         lat = sbufReadU32(src);
@@ -1793,6 +1801,7 @@ static mspResult_e mspFcProcessInCommand(uint8_t cmdMSP, sbuf_t *src)
         }
         break;
 #endif
+
     case MSP_SET_FEATURE_CONFIG:
         featureClearAll();
         featureSet(sbufReadU32(src)); // features bitmap
@@ -1804,59 +1813,6 @@ static mspResult_e mspFcProcessInCommand(uint8_t cmdMSP, sbuf_t *src)
         boardAlignmentMutable()->yawDegrees = sbufReadU16(src);
         break;
 
-    case MSP_SET_VOLTAGE_METER_CONFIG: {
-        int id = sbufReadU8(src);
-
-        //
-        // find and configure an ADC voltage sensor
-        //
-        int voltageSensorADCIndex;
-        for (voltageSensorADCIndex = 0; voltageSensorADCIndex < MAX_VOLTAGE_SENSOR_ADC; voltageSensorADCIndex++) {
-            if (id == voltageMeterADCtoIDMap[voltageSensorADCIndex]) {
-                break;
-            }
-        }
-
-        if (voltageSensorADCIndex < MAX_VOLTAGE_SENSOR_ADC) {
-            voltageSensorADCConfigMutable(voltageSensorADCIndex)->vbatscale = sbufReadU8(src);
-            voltageSensorADCConfigMutable(voltageSensorADCIndex)->vbatresdivval = sbufReadU8(src);
-            voltageSensorADCConfigMutable(voltageSensorADCIndex)->vbatresdivmultiplier = sbufReadU8(src);
-        } else {
-            // if we had any other types of voltage sensor to configure, this is where we'd do it.
-            return -1;
-        }
-        break;
-    }
-
-    case MSP_SET_CURRENT_METER_CONFIG: {
-        int id = sbufReadU8(src);
-
-        switch (id) {
-            case CURRENT_METER_ID_BATTERY_1:
-                currentSensorADCConfigMutable()->scale = sbufReadU16(src);
-                currentSensorADCConfigMutable()->offset = sbufReadU16(src);
-                break;
-            case CURRENT_METER_ID_VIRTUAL_1:
-                currentSensorVirtualConfigMutable()->scale = sbufReadU16(src);
-                currentSensorVirtualConfigMutable()->offset = sbufReadU16(src);
-                break;
-
-            default:
-                return -1;
-        }
-
-        break;
-    }
-
-    case MSP_SET_BATTERY_CONFIG:
-        batteryConfigMutable()->vbatmincellvoltage = sbufReadU8(src);      // vbatlevel_warn1 in MWC2.3 GUI
-        batteryConfigMutable()->vbatmaxcellvoltage = sbufReadU8(src);      // vbatlevel_warn2 in MWC2.3 GUI
-        batteryConfigMutable()->vbatwarningcellvoltage = sbufReadU8(src);  // vbatlevel when buzzer starts to alert
-        batteryConfigMutable()->batteryCapacity = sbufReadU16(src);
-        batteryConfigMutable()->voltageMeterSource = sbufReadU8(src);
-        batteryConfigMutable()->currentMeterSource = sbufReadU8(src);
-        break;
-
     case MSP_SET_MIXER_CONFIG:
 #ifndef USE_QUAD_MIXER_ONLY
         mixerConfigMutable()->mixerMode = sbufReadU8(src);
@@ -2013,6 +1969,139 @@ static mspResult_e mspFcProcessInCommand(uint8_t cmdMSP, sbuf_t *src)
     }
     return MSP_RESULT_ACK;
 }
+#endif
+
+static mspResult_e mspCommonProcessInCommand(uint8_t cmdMSP, sbuf_t *src)
+{
+    const unsigned int dataSize = sbufBytesRemaining(src);
+    UNUSED(dataSize); // maybe unused due to compiler options
+
+    switch (cmdMSP) {
+#ifdef TRANSPONDER
+    case MSP_SET_TRANSPONDER_CONFIG:
+        if (dataSize != sizeof(transponderConfig()->data)) {
+            return MSP_RESULT_ERROR;
+        }
+        for (unsigned int i = 0; i < sizeof(transponderConfig()->data); i++) {
+            transponderConfigMutable()->data[i] = sbufReadU8(src);
+        }
+        transponderUpdateData();
+        break;
+#endif
+
+    case MSP_SET_VOLTAGE_METER_CONFIG: {
+        int id = sbufReadU8(src);
+
+        //
+        // find and configure an ADC voltage sensor
+        //
+        int voltageSensorADCIndex;
+        for (voltageSensorADCIndex = 0; voltageSensorADCIndex < MAX_VOLTAGE_SENSOR_ADC; voltageSensorADCIndex++) {
+            if (id == voltageMeterADCtoIDMap[voltageSensorADCIndex]) {
+                break;
+            }
+        }
+
+        if (voltageSensorADCIndex < MAX_VOLTAGE_SENSOR_ADC) {
+            voltageSensorADCConfigMutable(voltageSensorADCIndex)->vbatscale = sbufReadU8(src);
+            voltageSensorADCConfigMutable(voltageSensorADCIndex)->vbatresdivval = sbufReadU8(src);
+            voltageSensorADCConfigMutable(voltageSensorADCIndex)->vbatresdivmultiplier = sbufReadU8(src);
+        } else {
+            // if we had any other types of voltage sensor to configure, this is where we'd do it.
+            return -1;
+        }
+        break;
+    }
+
+    case MSP_SET_CURRENT_METER_CONFIG: {
+        int id = sbufReadU8(src);
+
+        switch (id) {
+            case CURRENT_METER_ID_BATTERY_1:
+                currentSensorADCConfigMutable()->scale = sbufReadU16(src);
+                currentSensorADCConfigMutable()->offset = sbufReadU16(src);
+                break;
+#ifdef USE_VIRTUAL_CURRENT_METER
+            case CURRENT_METER_ID_VIRTUAL_1:
+                currentSensorVirtualConfigMutable()->scale = sbufReadU16(src);
+                currentSensorVirtualConfigMutable()->offset = sbufReadU16(src);
+                break;
+#endif
+
+            default:
+                return -1;
+        }
+
+        break;
+    }
+
+    case MSP_SET_BATTERY_CONFIG:
+        batteryConfigMutable()->vbatmincellvoltage = sbufReadU8(src);      // vbatlevel_warn1 in MWC2.3 GUI
+        batteryConfigMutable()->vbatmaxcellvoltage = sbufReadU8(src);      // vbatlevel_warn2 in MWC2.3 GUI
+        batteryConfigMutable()->vbatwarningcellvoltage = sbufReadU8(src);  // vbatlevel when buzzer starts to alert
+        batteryConfigMutable()->batteryCapacity = sbufReadU16(src);
+        batteryConfigMutable()->voltageMeterSource = sbufReadU8(src);
+        batteryConfigMutable()->currentMeterSource = sbufReadU8(src);
+        break;
+
+#if defined(OSD) || defined (USE_OSD_SLAVE)
+    case MSP_SET_OSD_CONFIG:
+        {
+            const uint8_t addr = sbufReadU8(src);
+            // set all the other settings
+            if ((int8_t)addr == -1) {
+#ifdef USE_MAX7456
+                vcdProfileMutable()->video_system = sbufReadU8(src);
+#else
+                sbufReadU8(src); // Skip video system
+#endif
+#if defined(OSD)
+                osdConfigMutable()->units = sbufReadU8(src);
+                osdConfigMutable()->rssi_alarm = sbufReadU8(src);
+                osdConfigMutable()->cap_alarm = sbufReadU16(src);
+                osdConfigMutable()->time_alarm = sbufReadU16(src);
+                osdConfigMutable()->alt_alarm = sbufReadU16(src);
+#endif
+            } else {
+#if defined(OSD)
+                // set a position setting
+                const uint16_t pos  = sbufReadU16(src);
+                if (addr < OSD_ITEM_COUNT) {
+                    osdConfigMutable()->item_pos[addr] = pos;
+                }
+#else
+                return MSP_RESULT_ERROR;
+#endif
+            }
+        }
+        break;
+
+    case MSP_OSD_CHAR_WRITE:
+#ifdef USE_MAX7456
+        {
+            uint8_t font_data[64];
+            const uint8_t addr = sbufReadU8(src);
+            for (int i = 0; i < 54; i++) {
+                font_data[i] = sbufReadU8(src);
+            }
+            // !!TODO - replace this with a device independent implementation
+            max7456WriteNvm(addr, font_data);
+        }
+        break;
+#else
+        return MSP_RESULT_ERROR;
+#endif
+#endif // OSD || USE_OSD_SLAVE
+
+    default:
+#ifdef USE_OSD_SLAVE
+        return mspOsdSlaveProcessInCommand(cmdMSP, src);
+#else
+        return mspFcProcessInCommand(cmdMSP, src);
+#endif
+    }
+    return MSP_RESULT_ERROR;
+}
 
 /*
  * Returns MSP_RESULT_ACK, MSP_RESULT_ERROR or MSP_RESULT_NO_REPLY
@@ -2026,8 +2115,16 @@ mspResult_e mspFcProcessCommand(mspPacket_t *cmd, mspPacket_t *reply, mspPostPro
     // initialize reply by default
     reply->cmd = cmd->cmd;
 
-    if (mspFcProcessOutCommand(cmdMSP, dst, mspPostProcessFn)) {
+    if (mspCommonProcessOutCommand(cmdMSP, dst, mspPostProcessFn)) {
         ret = MSP_RESULT_ACK;
+#ifndef USE_OSD_SLAVE
+    } else if (mspFcProcessOutCommand(cmdMSP, dst, mspPostProcessFn)) {
+        ret = MSP_RESULT_ACK;
+#endif
+#ifdef USE_OSD_SLAVE
+    } else if (mspOsdSlaveProcessOutCommand(cmdMSP, dst, mspPostProcessFn)) {
+        ret = MSP_RESULT_ACK;
+#endif
 #ifdef USE_SERIAL_4WAY_BLHELI_INTERFACE
     } else if (cmdMSP == MSP_SET_4WAY_IF) {
         mspFc4waySerialCommand(dst, src, mspPostProcessFn);
@@ -2044,7 +2141,7 @@ mspResult_e mspFcProcessCommand(mspPacket_t *cmd, mspPacket_t *reply, mspPostPro
         ret = MSP_RESULT_ACK;
 #endif
     } else {
-        ret = mspFcProcessInCommand(cmdMSP, src);
+        ret = mspCommonProcessInCommand(cmdMSP, src);
     }
     reply->result = ret;
     return ret;
@@ -2104,7 +2201,15 @@ void mspFcProcessReply(mspPacket_t *reply)
 /*
  * Return a pointer to the process command function
  */
+#ifndef USE_OSD_SLAVE
 void mspFcInit(void)
 {
     initActiveBoxIds();
 }
+#endif
+
+#ifdef USE_OSD_SLAVE
+void mspOsdSlaveInit(void)
+{
+}
+#endif
diff --git a/src/main/fc/fc_msp.h b/src/main/fc/fc_msp.h
index 7992a9f15..c5ccb1f1c 100644
--- a/src/main/fc/fc_msp.h
+++ b/src/main/fc/fc_msp.h
@@ -30,5 +30,6 @@ const box_t *findBoxByBoxId(uint8_t boxId);
 const box_t *findBoxByPermanentId(uint8_t permenantId);
 
 void mspFcInit(void);
+void mspOsdSlaveInit(void);
 mspResult_e mspFcProcessCommand(mspPacket_t *cmd, mspPacket_t *reply, mspPostProcessFnPtr *mspPostProcessFn);
 void mspFcProcessReply(mspPacket_t *reply);
diff --git a/src/main/fc/fc_rc.c b/src/main/fc/fc_rc.c
index a22c3affd..3754a4e61 100755
--- a/src/main/fc/fc_rc.c
+++ b/src/main/fc/fc_rc.c
@@ -28,7 +28,6 @@
 #include "common/utils.h"
 #include "common/filter.h"
 
-#include "config/config_profile.h"
 #include "config/feature.h"
 #include "config/parameter_group.h"
 #include "config/parameter_group_ids.h"
diff --git a/src/main/fc/fc_tasks.c b/src/main/fc/fc_tasks.c
index 1274d4334..2002d3899 100644
--- a/src/main/fc/fc_tasks.c
+++ b/src/main/fc/fc_tasks.c
@@ -29,7 +29,6 @@
 #include "common/filter.h"
 
 #include "config/feature.h"
-#include "config/config_profile.h"
 #include "config/parameter_group.h"
 #include "config/parameter_group_ids.h"
 
@@ -90,12 +89,14 @@ void taskBstMasterProcess(timeUs_t currentTimeUs);
 #define TASK_PERIOD_MS(ms) ((ms) * 1000)
 #define TASK_PERIOD_US(us) (us)
 
+#ifndef USE_OSD_SLAVE
 static void taskUpdateAccelerometer(timeUs_t currentTimeUs)
 {
     UNUSED(currentTimeUs);
 
     accUpdate(&accelerometerConfigMutable()->accelerometerTrims);
 }
+#endif
 
 bool taskSerialCheck(timeUs_t currentTimeUs, timeDelta_t currentDeltaTimeUs) {
     UNUSED(currentTimeUs);
@@ -130,6 +131,7 @@ void taskBatteryAlerts(timeUs_t currentTimeUs)
     batteryUpdateAlarms();
 }
 
+#ifndef USE_OSD_SLAVE
 static void taskUpdateRxMain(timeUs_t currentTimeUs)
 {
     processRx(currentTimeUs);
@@ -153,6 +155,7 @@ static void taskUpdateRxMain(timeUs_t currentTimeUs)
     }
 #endif
 }
+#endif
 
 #ifdef MAG
 static void taskUpdateCompass(timeUs_t currentTimeUs)
@@ -242,6 +245,7 @@ void osdSlaveTasksInit(void)
 }
 #endif
 
+#ifndef USE_OSD_SLAVE
 void fcTasksInit(void)
 {
     schedulerInit();
@@ -343,6 +347,7 @@ void fcTasksInit(void)
     setTaskEnabled(TASK_GYRO_DATA_ANALYSE, true);
 #endif
 }
+#endif
 
 cfTask_t cfTasks[TASK_COUNT] = {
     [TASK_SYSTEM] = {
@@ -352,6 +357,7 @@ cfTask_t cfTasks[TASK_COUNT] = {
         .staticPriority = TASK_PRIORITY_MEDIUM_HIGH,
     },
 
+#ifndef USE_OSD_SLAVE
     [TASK_GYROPID] = {
         .taskName = "PID",
         .subTaskName = "GYRO",
@@ -381,6 +387,7 @@ cfTask_t cfTasks[TASK_COUNT] = {
         .desiredPeriod = TASK_PERIOD_HZ(50),        // If event-based scheduling doesn't work, fallback to periodic scheduling
         .staticPriority = TASK_PRIORITY_HIGH,
     },
+#endif
 
     [TASK_SERIAL] = {
         .taskName = "SERIAL",
@@ -395,12 +402,14 @@ cfTask_t cfTasks[TASK_COUNT] = {
 #endif
     },
 
+#ifndef USE_OSD_SLAVE
     [TASK_DISPATCH] = {
         .taskName = "DISPATCH",
         .taskFunc = dispatchProcess,
         .desiredPeriod = TASK_PERIOD_HZ(1000),
         .staticPriority = TASK_PRIORITY_HIGH,
     },
+#endif
 
     [TASK_BATTERY_ALERTS] = {
         .taskName = "BATTERY_ALERTS",
@@ -421,6 +430,8 @@ cfTask_t cfTasks[TASK_COUNT] = {
         .desiredPeriod = TASK_PERIOD_HZ(50),
         .staticPriority = TASK_PRIORITY_MEDIUM,
     },
+#ifndef USE_OSD_SLAVE
+
 #ifdef BEEPER
     [TASK_BEEPER] = {
         .taskName = "BEEPER",
@@ -474,6 +485,7 @@ cfTask_t cfTasks[TASK_COUNT] = {
         .staticPriority = TASK_PRIORITY_LOW,
     },
 #endif
+#endif
 
 #ifdef TRANSPONDER
     [TASK_TRANSPONDER] = {
@@ -484,6 +496,7 @@ cfTask_t cfTasks[TASK_COUNT] = {
     },
 #endif
 
+#ifndef USE_OSD_SLAVE
 #ifdef USE_DASHBOARD
     [TASK_DASHBOARD] = {
         .taskName = "DASHBOARD",
@@ -500,6 +513,8 @@ cfTask_t cfTasks[TASK_COUNT] = {
         .staticPriority = TASK_PRIORITY_LOW,
     },
 #endif
+#endif
+
 #ifdef USE_OSD_SLAVE
     [TASK_OSD_SLAVE] = {
         .taskName = "OSD_SLAVE",
@@ -509,6 +524,8 @@ cfTask_t cfTasks[TASK_COUNT] = {
         .staticPriority = TASK_PRIORITY_HIGH,
     },
 #endif
+
+#ifndef USE_OSD_SLAVE
 #ifdef TELEMETRY
     [TASK_TELEMETRY] = {
         .taskName = "TELEMETRY",
@@ -580,4 +597,5 @@ cfTask_t cfTasks[TASK_COUNT] = {
         .staticPriority = TASK_PRIORITY_MEDIUM,
     },
 #endif
+#endif
 };
diff --git a/src/main/flight/navigation.c b/src/main/flight/navigation.c
index 5f98d4ddc..32c032932 100644
--- a/src/main/flight/navigation.c
+++ b/src/main/flight/navigation.c
@@ -31,7 +31,6 @@
 #include "common/maths.h"
 #include "common/time.h"
 
-#include "config/config_profile.h"
 #include "config/parameter_group.h"
 #include "config/parameter_group_ids.h"
 
diff --git a/src/main/flight/pid.c b/src/main/flight/pid.c
index 002bec1d8..7c13587f0 100644
--- a/src/main/flight/pid.c
+++ b/src/main/flight/pid.c
@@ -32,7 +32,6 @@
 #include "config/config_reset.h"
 #include "config/parameter_group.h"
 #include "config/parameter_group_ids.h"
-#include "config/config_profile.h"
 
 #include "fc/fc_core.h"
 #include "fc/fc_rc.h"
diff --git a/src/main/flight/pid.h b/src/main/flight/pid.h
index ce8acddfb..07db82efe 100644
--- a/src/main/flight/pid.h
+++ b/src/main/flight/pid.h
@@ -17,6 +17,7 @@
 
 #pragma once
 
+#ifndef USE_OSD_SLAVE
 #include <stdbool.h>
 #include "config/parameter_group.h"
 
@@ -85,11 +86,6 @@ typedef struct pidProfile_s {
     uint16_t rateAccelLimit;                // accel limiter roll/pitch deg/sec/ms
 } pidProfile_t;
 
-#if FLASH_SIZE <= 128
-#define MAX_PROFILE_COUNT 2
-#else
-#define MAX_PROFILE_COUNT 3
-#endif
 PG_DECLARE_ARRAY(pidProfile_t, MAX_PROFILE_COUNT, pidProfiles);
 
 typedef struct pidConfig_s {
@@ -116,3 +112,4 @@ void pidInitFilters(const pidProfile_t *pidProfile);
 void pidInitConfig(const pidProfile_t *pidProfile);
 void pidInit(const pidProfile_t *pidProfile);
 
+#endif
diff --git a/src/main/io/dashboard.c b/src/main/io/dashboard.c
index 2a65a6e63..55e273c99 100644
--- a/src/main/io/dashboard.c
+++ b/src/main/io/dashboard.c
@@ -43,7 +43,6 @@
 #include "common/typeconversion.h"
 
 #include "config/feature.h"
-#include "config/config_profile.h"
 #include "config/parameter_group.h"
 #include "config/parameter_group_ids.h"
 
diff --git a/src/main/io/ledstrip.c b/src/main/io/ledstrip.c
index 272bad32a..9740daa50 100644
--- a/src/main/io/ledstrip.c
+++ b/src/main/io/ledstrip.c
@@ -34,7 +34,6 @@
 #include "common/typeconversion.h"
 #include "common/utils.h"
 
-#include "config/config_profile.h"
 #include "config/feature.h"
 #include "config/parameter_group.h"
 #include "config/parameter_group_ids.h"
diff --git a/src/main/io/osd.c b/src/main/io/osd.c
index 0769775c6..b10208e20 100644
--- a/src/main/io/osd.c
+++ b/src/main/io/osd.c
@@ -48,7 +48,6 @@
 #include "common/typeconversion.h"
 #include "common/utils.h"
 
-#include "config/config_profile.h"
 #include "config/feature.h"
 #include "config/parameter_group.h"
 #include "config/parameter_group_ids.h"
@@ -75,8 +74,8 @@
 #include "fc/runtime_config.h"
 
 #include "flight/altitude.h"
+#include "flight/pid.h"
 #include "flight/imu.h"
-#include "flight/altitude.h"
 
 #include "rx/rx.h"
 
diff --git a/src/main/osd_slave/osd_slave_init.c b/src/main/osd_slave/osd_slave_init.c
new file mode 100644
index 000000000..4e68ca8fa
--- /dev/null
+++ b/src/main/osd_slave/osd_slave_init.c
@@ -0,0 +1,285 @@
+/*
+ * This file is part of Cleanflight.
+ *
+ * Cleanflight is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Cleanflight is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Cleanflight.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdbool.h>
+#include <stdint.h>
+#include <string.h>
+
+#include "platform.h"
+
+#include "blackbox/blackbox.h"
+
+#include "common/axis.h"
+#include "common/color.h"
+#include "common/maths.h"
+#include "common/printf.h"
+
+#include "config/config_eeprom.h"
+#include "config/feature.h"
+#include "config/parameter_group.h"
+#include "config/parameter_group_ids.h"
+
+#include "drivers/nvic.h"
+#include "drivers/sensor.h"
+#include "drivers/system.h"
+#include "drivers/dma.h"
+#include "drivers/io.h"
+#include "drivers/light_led.h"
+#include "drivers/sound_beeper.h"
+#include "drivers/timer.h"
+#include "drivers/serial.h"
+#include "drivers/serial_softserial.h"
+#include "drivers/serial_uart.h"
+#include "drivers/adc.h"
+#include "drivers/bus_i2c.h"
+#include "drivers/bus_spi.h"
+#include "drivers/inverter.h"
+#include "drivers/usb_io.h"
+#include "drivers/transponder_ir.h"
+#include "drivers/exti.h"
+
+#include "fc/config.h"
+#include "osd_slave/osd_slave_init.h"
+#include "fc/fc_msp.h"
+#include "fc/fc_tasks.h"
+#include "fc/rc_controls.h"
+#include "fc/runtime_config.h"
+#include "fc/cli.h"
+
+#include "msp/msp_serial.h"
+
+#include "rx/rx.h"
+#include "rx/spektrum.h"
+
+#include "io/beeper.h"
+#include "io/displayport_max7456.h"
+#include "io/serial.h"
+#include "io/flashfs.h"
+#include "io/ledstrip.h"
+#include "io/transponder_ir.h"
+#include "io/osd_slave.h"
+
+#include "scheduler/scheduler.h"
+
+#include "sensors/acceleration.h"
+#include "sensors/barometer.h"
+#include "sensors/battery.h"
+
+#ifdef USE_HARDWARE_REVISION_DETECTION
+#include "hardware_revision.h"
+#endif
+
+#include "build/build_config.h"
+#include "build/debug.h"
+
+#ifdef TARGET_PREINIT
+void targetPreInit(void);
+#endif
+
+#ifdef TARGET_BUS_INIT
+void targetBusInit(void);
+#endif
+
+uint8_t systemState = SYSTEM_STATE_INITIALISING;
+
+void processLoopback(void)
+{
+}
+
+
+#ifdef BUS_SWITCH_PIN
+void busSwitchInit(void)
+{
+static IO_t busSwitchResetPin        = IO_NONE;
+
+    busSwitchResetPin = IOGetByTag(IO_TAG(BUS_SWITCH_PIN));
+    IOInit(busSwitchResetPin, OWNER_SYSTEM, 0);
+    IOConfigGPIO(busSwitchResetPin, IOCFG_OUT_PP);
+
+    // ENABLE
+    IOLo(busSwitchResetPin);
+}
+#endif
+
+void init(void)
+{
+#ifdef USE_HAL_DRIVER
+    HAL_Init();
+#endif
+
+    printfSupportInit();
+
+    systemInit();
+
+    // initialize IO (needed for all IO operations)
+    IOInitGlobal();
+
+#ifdef USE_HARDWARE_REVISION_DETECTION
+    detectHardwareRevision();
+#endif
+
+    initEEPROM();
+
+    ensureEEPROMContainsValidData();
+    readEEPROM();
+
+    systemState |= SYSTEM_STATE_CONFIG_LOADED;
+
+    debugMode = systemConfig()->debug_mode;
+
+    // Latch active features to be used for feature() in the remainder of init().
+    latchActiveFeatures();
+
+#ifdef TARGET_PREINIT
+    targetPreInit();
+#endif
+
+    ledInit(statusLedConfig());
+    LED2_ON;
+
+#ifdef USE_EXTI
+    EXTIInit();
+#endif
+
+    delay(100);
+
+    timerInit();  // timer must be initialized before any channel is allocated
+
+#ifdef BUS_SWITCH_PIN
+    busSwitchInit();
+#endif
+
+    serialInit(false, SERIAL_PORT_NONE);
+
+#ifdef BEEPER
+    beeperInit(beeperDevConfig());
+#endif
+/* temp until PGs are implemented. */
+#ifdef USE_INVERTER
+    initInverters();
+#endif
+
+#ifdef TARGET_BUS_INIT
+    targetBusInit();
+#else
+
+#ifdef USE_SPI
+#ifdef USE_SPI_DEVICE_1
+    spiInit(SPIDEV_1);
+#endif
+#ifdef USE_SPI_DEVICE_2
+    spiInit(SPIDEV_2);
+#endif
+#ifdef USE_SPI_DEVICE_3
+    spiInit(SPIDEV_3);
+#endif
+#ifdef USE_SPI_DEVICE_4
+    spiInit(SPIDEV_4);
+#endif
+#endif /* USE_SPI */
+
+#ifdef USE_I2C
+#ifdef USE_I2C_DEVICE_1
+    i2cInit(I2CDEV_1);
+#endif
+#ifdef USE_I2C_DEVICE_2
+    i2cInit(I2CDEV_2);
+#endif
+#ifdef USE_I2C_DEVICE_3
+    i2cInit(I2CDEV_3);
+#endif  
+#ifdef USE_I2C_DEVICE_4
+    i2cInit(I2CDEV_4);
+#endif  
+#endif /* USE_I2C */
+
+#endif /* TARGET_BUS_INIT */
+
+#ifdef USE_HARDWARE_REVISION_DETECTION
+    updateHardwareRevision();
+#endif
+
+#ifdef USE_ADC
+    adcConfigMutable()->vbat.enabled = (batteryConfig()->voltageMeterSource == VOLTAGE_METER_ADC);
+    adcConfigMutable()->current.enabled = (batteryConfig()->currentMeterSource == CURRENT_METER_ADC);
+
+    adcConfigMutable()->rssi.enabled = feature(FEATURE_RSSI_ADC);
+    adcInit(adcConfig());
+#endif
+
+    LED1_ON;
+    LED0_OFF;
+    LED2_OFF;
+
+    for (int i = 0; i < 10; i++) {
+        LED1_TOGGLE;
+        LED0_TOGGLE;
+        delay(25);
+        if (!(getBeeperOffMask() & (1 << (BEEPER_SYSTEM_INIT - 1)))) BEEP_ON;
+        delay(25);
+        BEEP_OFF;
+    }
+    LED0_OFF;
+    LED1_OFF;
+
+    mspOsdSlaveInit();
+    mspSerialInit();
+
+#ifdef USE_CLI
+    cliInit(serialConfig());
+#endif
+
+    displayPort_t *osdDisplayPort = NULL;
+
+#if defined(USE_MAX7456)
+    // If there is a max7456 chip for the OSD then use it
+    osdDisplayPort = max7456DisplayPortInit(vcdProfile());
+    // osdInit  will register with CMS by itself.
+    osdSlaveInit(osdDisplayPort);
+#endif
+
+#ifdef LED_STRIP
+    ledStripInit();
+
+    if (feature(FEATURE_LED_STRIP)) {
+        ledStripEnable();
+    }
+#endif
+
+#ifdef USB_DETECT_PIN
+    usbCableDetectInit();
+#endif
+
+#ifdef TRANSPONDER
+    if (feature(FEATURE_TRANSPONDER)) {
+        transponderInit();
+        transponderStartRepeating();
+        systemState |= SYSTEM_STATE_TRANSPONDER_ENABLED;
+    }
+#endif
+
+    timerStart();
+
+    batteryInit();
+
+    // Latch active features AGAIN since some may be modified by init().
+    latchActiveFeatures();
+
+    osdSlaveTasksInit();
+
+    systemState |= SYSTEM_STATE_READY;
+}
diff --git a/src/main/config/config_profile.h b/src/main/osd_slave/osd_slave_init.h
similarity index 73%
rename from src/main/config/config_profile.h
rename to src/main/osd_slave/osd_slave_init.h
index c741b2a55..97c9b59ed 100644
--- a/src/main/config/config_profile.h
+++ b/src/main/osd_slave/osd_slave_init.h
@@ -17,8 +17,13 @@
 
 #pragma once
 
-#include "flight/pid.h"
+typedef enum {
+    SYSTEM_STATE_INITIALISING   = 0,
+    SYSTEM_STATE_CONFIG_LOADED  = (1 << 0),
+    SYSTEM_STATE_TRANSPONDER_ENABLED = (1 << 3),
+    SYSTEM_STATE_READY          = (1 << 7)
+} systemState_e;
 
-typedef struct profile_s {
-    pidProfile_t pidProfile;
-} profile_t;
+extern uint8_t systemState;
+
+void init(void);
diff --git a/src/main/platform.h b/src/main/platform.h
index 1130c74d5..4055749f9 100644
--- a/src/main/platform.h
+++ b/src/main/platform.h
@@ -82,6 +82,11 @@
 #error "Invalid chipset specified. Update platform.h"
 #endif
 
-#include "target/common.h"
+#ifdef USE_OSD_SLAVE
+#include "target/common_osd_slave.h"
 #include "target.h"
-#include "target/common_post.h"
+#else
+#include "target/common_fc_pre.h"
+#include "target.h"
+#include "target/common_fc_post.h"
+#endif
diff --git a/src/main/sensors/battery.c b/src/main/sensors/battery.c
index d37a9bf98..ed289aaec 100644
--- a/src/main/sensors/battery.c
+++ b/src/main/sensors/battery.c
@@ -73,7 +73,11 @@ static batteryState_e consumptionState;
 #ifdef BOARD_HAS_CURRENT_SENSOR
 #define DEFAULT_CURRENT_METER_SOURCE CURRENT_METER_ADC
 #else
+#ifdef USE_VIRTUAL_CURRENT_METER
 #define DEFAULT_CURRENT_METER_SOURCE CURRENT_METER_VIRTUAL
+#else
+#define DEFAULT_CURRENT_METER_SOURCE CURRENT_METER_NONE
+#endif
 #endif
 
 #ifdef BOARD_HAS_VOLTAGE_DIVIDER
@@ -290,11 +294,15 @@ void batteryInit(void)
             break;
 
         case CURRENT_METER_VIRTUAL:
+#ifdef USE_VIRTUAL_CURRENT_METER
             currentMeterVirtualInit();
+#endif
             break;
 
         case CURRENT_METER_ESC:
+#ifdef ESC_SENSOR
             currentMeterESCInit();
+#endif
             break;
 
         default:
@@ -337,12 +345,14 @@ void batteryUpdateCurrentMeter(timeUs_t currentTimeUs)
             break;
 
         case CURRENT_METER_VIRTUAL: {
+#ifdef USE_VIRTUAL_CURRENT_METER
             throttleStatus_e throttleStatus = calculateThrottleStatus();
             bool throttleLowAndMotorStop = (throttleStatus == THROTTLE_LOW && feature(FEATURE_MOTOR_STOP));
             int32_t throttleOffset = (int32_t)rcCommand[THROTTLE] - 1000;
 
             currentMeterVirtualRefresh(lastUpdateAt, ARMING_FLAG(ARMED), throttleLowAndMotorStop, throttleOffset);
             currentMeterVirtualRead(&currentMeter);
+#endif
             break;
         }
 
diff --git a/src/main/sensors/current.c b/src/main/sensors/current.c
index 403166fd6..67b170fd3 100644
--- a/src/main/sensors/current.c
+++ b/src/main/sensors/current.c
@@ -38,7 +38,9 @@
 
 const uint8_t currentMeterIds[] = {
     CURRENT_METER_ID_BATTERY_1,
+#ifdef USE_VIRTUAL_CURRENT_METER
     CURRENT_METER_ID_VIRTUAL_1,
+#endif
 #ifdef USE_ESC_SENSOR
     CURRENT_METER_ID_ESC_COMBINED_1,
     CURRENT_METER_ID_ESC_MOTOR_1,
@@ -93,7 +95,9 @@ PG_RESET_TEMPLATE(currentSensorADCConfig_t, currentSensorADCConfig,
     .offset = CURRENT_METER_OFFSET_DEFAULT,
 );
 
+#ifdef USE_VIRTUAL_CURRENT_METER
 PG_REGISTER(currentSensorVirtualConfig_t, currentSensorVirtualConfig, PG_CURRENT_SENSOR_VIRTUAL_CONFIG, 0);
+#endif
 
 static int32_t currentMeterADCToCentiamps(const uint16_t src)
 {
@@ -144,6 +148,7 @@ void currentMeterADCRead(currentMeter_t *meter)
 // VIRTUAL
 //
 
+#ifdef USE_VIRTUAL_CURRENT_METER
 currentSensorVirtualState_t currentMeterVirtualState;
 
 void currentMeterVirtualInit(void)
@@ -171,6 +176,7 @@ void currentMeterVirtualRead(currentMeter_t *meter)
     meter->amperage = currentMeterVirtualState.amperage;
     meter->mAhDrawn = currentMeterVirtualState.mahDrawnState.mAhDrawn;
 }
+#endif
 
 //
 // ESC
@@ -178,19 +184,16 @@ void currentMeterVirtualRead(currentMeter_t *meter)
 
 #ifdef USE_ESC_SENSOR
 currentMeterESCState_t currentMeterESCState;
-#endif
 
 void currentMeterESCInit(void)
 {
-#ifdef USE_ESC_SENSOR
     memset(&currentMeterESCState, 0, sizeof(currentMeterESCState_t));
-#endif
 }
 
 void currentMeterESCRefresh(int32_t lastUpdateAt)
 {
     UNUSED(lastUpdateAt);
-#ifdef USE_ESC_SENSOR
+
     escSensorData_t *escData = getEscSensorData(ESC_SENSOR_COMBINED);
     if (escData->dataAge <= ESC_BATTERY_AGE_MAX) {
         currentMeterESCState.amperage = escData->current;
@@ -199,26 +202,18 @@ void currentMeterESCRefresh(int32_t lastUpdateAt)
         currentMeterESCState.amperage = 0;
         currentMeterESCState.mAhDrawn = 0;
     }
-#endif
 }
 
 void currentMeterESCReadCombined(currentMeter_t *meter)
 {
-#ifdef USE_ESC_SENSOR
     meter->amperageLatest = currentMeterESCState.amperage;
     meter->amperage = currentMeterESCState.amperage;
     meter->mAhDrawn = currentMeterESCState.mAhDrawn;
-#else
     currentMeterReset(meter);
-#endif
 }
 
 void currentMeterESCReadMotor(uint8_t motorNumber, currentMeter_t *meter)
 {
-#ifndef USE_ESC_SENSOR
-    UNUSED(motorNumber);
-    currentMeterReset(meter);
-#else
     escSensorData_t *escData = getEscSensorData(motorNumber);
     if (escData && escData->dataAge <= ESC_BATTERY_AGE_MAX) {
         meter->amperage = escData->current;
@@ -227,8 +222,8 @@ void currentMeterESCReadMotor(uint8_t motorNumber, currentMeter_t *meter)
     } else {
         currentMeterReset(meter);
     }
-#endif
 }
+#endif
 
 //
 // API for current meters using IDs
@@ -240,19 +235,22 @@ void currentMeterRead(currentMeterId_e id, currentMeter_t *meter)
 {
     if (id == CURRENT_METER_ID_BATTERY_1) {
         currentMeterADCRead(meter);
-    } else if (id == CURRENT_METER_ID_VIRTUAL_1) {
+    }
+#ifdef USE_VIRTUAL_CURRENT_METER
+    else if (id == CURRENT_METER_ID_VIRTUAL_1) {
         currentMeterVirtualRead(meter);
     }
+#endif
 #ifdef USE_ESC_SENSOR
-    if (id == CURRENT_METER_ID_ESC_COMBINED_1) {
+    else if (id == CURRENT_METER_ID_ESC_COMBINED_1) {
         currentMeterESCReadCombined(meter);
-    } else
-    if (id >= CURRENT_METER_ID_ESC_MOTOR_1 && id <= CURRENT_METER_ID_ESC_MOTOR_20 ) {
+    }
+    else if (id >= CURRENT_METER_ID_ESC_MOTOR_1 && id <= CURRENT_METER_ID_ESC_MOTOR_20 ) {
         int motor = id - CURRENT_METER_ID_ESC_MOTOR_1;
         currentMeterESCReadMotor(motor, meter);
-    } else
+    }
 #endif
-    {
+    else {
         currentMeterReset(meter);
     }
 }
diff --git a/src/main/target/COLIBRI_RACE/i2c_bst.c b/src/main/target/COLIBRI_RACE/i2c_bst.c
index 3039c5272..feb3a0b83 100644
--- a/src/main/target/COLIBRI_RACE/i2c_bst.c
+++ b/src/main/target/COLIBRI_RACE/i2c_bst.c
@@ -69,7 +69,6 @@
 #include "flight/servos.h"
 
 #include "config/config_eeprom.h"
-#include "config/config_profile.h"
 #include "config/feature.h"
 
 #include "bus_bst.h"
diff --git a/src/main/target/SPRACINGF3OSD/target.h b/src/main/target/SPRACINGF3OSD/target.h
index 6414d2f90..2b0b1a053 100644
--- a/src/main/target/SPRACINGF3OSD/target.h
+++ b/src/main/target/SPRACINGF3OSD/target.h
@@ -88,20 +88,6 @@
 
 #define TRANSPONDER
 
-#define USE_OSD_SLAVE
-
-#undef OSD
-#undef GPS
-#undef BLACKBOX
-#undef TELEMETRY
-#undef USE_SERVOS
-#undef VTX_COMMON
-#undef VTX_CONTROL
-#undef VTX_SMARTAUDIO
-#undef VTX_TRAMP
-#undef USE_MSP_DISPLAYPORT
-
-
 #define DEFAULT_FEATURES        (FEATURE_TRANSPONDER)
 
 // IO - assuming 303 in 64pin package, TODO
diff --git a/src/main/target/common_post.h b/src/main/target/common_fc_post.h
similarity index 100%
rename from src/main/target/common_post.h
rename to src/main/target/common_fc_post.h
diff --git a/src/main/target/common.h b/src/main/target/common_fc_pre.h
similarity index 96%
rename from src/main/target/common.h
rename to src/main/target/common_fc_pre.h
index bc8d2a157..c7b272f5c 100644
--- a/src/main/target/common.h
+++ b/src/main/target/common_fc_pre.h
@@ -81,6 +81,12 @@
 #define USE_SERIALRX_SUMH       // Graupner legacy protocol
 #define USE_SERIALRX_XBUS       // JR
 
+#if (FLASH_SIZE > 64)
+#define MAX_PROFILE_COUNT 3
+#else
+#define MAX_PROFILE_COUNT 2
+#endif
+
 #if (FLASH_SIZE > 64)
 #define BLACKBOX
 #define LED_STRIP
@@ -106,6 +112,7 @@
 #define USE_RX_MSP
 #define USE_SERIALRX_JETIEXBUS
 #define USE_SENSOR_NAMES
+#define USE_VIRTUAL_CURRENT_METER
 #define VTX_COMMON
 #define VTX_CONTROL
 #define VTX_SMARTAUDIO
diff --git a/src/main/target/common_osd_slave.h b/src/main/target/common_osd_slave.h
new file mode 100644
index 000000000..fa4be9f2a
--- /dev/null
+++ b/src/main/target/common_osd_slave.h
@@ -0,0 +1,60 @@
+/*
+ * This file is part of Cleanflight.
+ *
+ * Cleanflight is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Cleanflight is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Cleanflight.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#define USE_PARAMETER_GROUPS
+// type conversion warnings.
+// -Wconversion can be turned on to enable the process of eliminating these warnings
+//#pragma GCC diagnostic warning "-Wconversion"
+#pragma GCC diagnostic ignored "-Wsign-conversion"
+// -Wpadded can be turned on to check padding of structs
+//#pragma GCC diagnostic warning "-Wpadded"
+
+//#define SCHEDULER_DEBUG // define this to use scheduler debug[] values. Undefined by default for performance reasons
+#define DEBUG_MODE DEBUG_NONE // change this to change initial debug mode
+
+#define I2C1_OVERCLOCK true
+#define I2C2_OVERCLOCK true
+
+#define MAX_PROFILE_COUNT 0
+
+#ifdef STM32F1
+#define MINIMAL_CLI
+#endif
+
+#ifdef STM32F3
+#define MINIMAL_CLI
+#endif
+
+#ifdef STM32F4
+#define I2C3_OVERCLOCK true
+#endif
+
+#ifdef STM32F7
+#define I2C3_OVERCLOCK true
+#define I2C4_OVERCLOCK true
+#endif
+
+#if defined(STM32F4) || defined(STM32F7)
+#define SCHEDULER_DELAY_LIMIT           10
+#else
+#define SCHEDULER_DELAY_LIMIT           100
+#endif
+
+//CLI needs FC dependencies removed before we can compile it, disabling for now
+//#define USE_CLI
diff --git a/src/main/telemetry/mavlink.c b/src/main/telemetry/mavlink.c
index 8210774ce..c6106da7f 100755
--- a/src/main/telemetry/mavlink.c
+++ b/src/main/telemetry/mavlink.c
@@ -32,7 +32,6 @@
 #include "common/axis.h"
 #include "common/color.h"
 
-#include "config/config_profile.h"
 #include "config/feature.h"
 #include "config/parameter_group.h"
 #include "config/parameter_group_ids.h"
diff --git a/src/main/telemetry/smartport.c b/src/main/telemetry/smartport.c
index 9be06c9ff..abff32b1b 100644
--- a/src/main/telemetry/smartport.c
+++ b/src/main/telemetry/smartport.c
@@ -16,7 +16,6 @@
 #include "common/maths.h"
 #include "common/utils.h"
 
-#include "config/config_profile.h"
 #include "config/feature.h"
 #include "config/parameter_group.h"
 #include "config/parameter_group_ids.h"
diff --git a/src/test/unit/platform.h b/src/test/unit/platform.h
index e3cbbab9e..06586546d 100644
--- a/src/test/unit/platform.h
+++ b/src/test/unit/platform.h
@@ -23,6 +23,7 @@
 #define U_ID_1 1
 #define U_ID_2 2
 
+#define MAX_PROFILE_COUNT 3
 #define MAG
 #define BARO
 #define GPS